Lens Materials - Everything you need to know | Thin Lenses Advice

[@nicholaslegere1148]

I’m an Optician in Halifax, Nova Scotia and I watch at least one of your videos a day to help improve my vocabulary when I’m selling or educating. Please continue your fantastic work !

[@thespectaclefactory]

Happy to help you Nicholas, and thank you! I want to spread my love of eyewear all over the world. Thank you for being part of that

[@rogerf3622]

A clear and concise explanation from a guy that obviously knows the material so well that he can easily explain it to a layman. Thank you!

[@thespectaclefactory]

Thanks Roger! I live and breathe optics and love to help others

[@euterpeal]

@@thespectaclefactory Hi :) I'd like to know How do i get a +20 prescription avoiding lenticular forms on eyeglasses, maybe with Trivex or Tribrid.

[@shadab8190]

In India you visit an opticians and ask for lenses and what they choose they will give you (as per their availability and profit). I am talking about the general majority. I am thankful to you for your knowledge that you are giving us. ♥️

[@thespectaclefactory]

❤️

[@pranavgautam96]

Hey. Where do you get your specs made from? I have not been able to find anyone with this guy's level of knowledge and a sense of work.

[@volchonokilliR]

Thank you! So much new information. I usually learn things by myself, but for some reason there is no information online on lenses for glasses. Only marketing (even that is hard to find) by biggest brands. And opticians in the shops I've visited don't seem to be able or willing to answer my questions, instead trying to dumb down and push some of the options on me with a general explanation on the level of "these are better".

[@BaBaDoo0]

Refractive index is actually the speed of light in this given material ÷ 😊👍

[@thespectaclefactory]

Correct!

[@Mickey_Bauer]

Thank you! My whole life i've been buying polycarbonate lenses because all of the opticians recommend them all the time so i thought they were superior in every way. I avoided the plastic ones because i thought they were junk. Thanks to you, i just learned that polycarbonate ones are actually trash and the CR-39 plastic has much better optics (almost as good as glass). Frames Direct doesn't offer glass or Trivex so i think i'll go with CR-39 plastic this time. Cheers!

[@JayJay-du4tp]

Awesome video. Very informative. Exactly what I was looking for.

[@thespectaclefactory]

So glad I was able to help

[@alanfromlondon]

Excellent video! 😊💖 5:40 I've never had an optician mention Abbe value to me before. 👍 As a general rule is it safe to say that... the higher index (thinner) your lenses, the more you're going to experience chromatic aberrations (colour fringes) because the Abbe value will be lower? 9:13 Wow, this is fantastic software, I've never seen anything like this. 😀 Yes, it's such a shame when you collect your glasses and the lenses are (unfortunately) thicker than you expected, because you weren't given any sort of visualisation.

[@thespectaclefactory]

Hi Alan, thank you 🙏that is a good general rule, except for polycarbonate.

[@madamel.6756]

Thank you for this useful video. I especially appreciate you talking about helping people make an *informed* decision. Unfortunately that was not my experience when I recently got a pair. I was basically told “Well… there is 1.60 and 1.66, you should go with 1.66” lol! Keep in mind, at that point I had absolutely no idea what these numbers even referred to. I now know it it’s the index of refraction, but I was not told anything whatsoever about the pros and cons of these, and no other options were mentioned. So I ended up with what was basically chosen for me, and I hated the result. At -5.0, I ended up seeing chromatic aberrations everywhere. I had to go back several times to explain this was not acceptable, and having done my research in the meantime, I could back up my claims. They do not offer Trivex, so they should replace my lenses with CR39, having warned me that they’ll be thick. Haven’t seen the result yet, so I'm keeping my fingers crossed, but next time, I’ll go somewhere else!

[@thespectaclefactory]

That's sadly a very common story in our industry, and it's why I make these videos. Thanks for sharing

[@novideostoday]

@madamel.6756 How did it turn out?

[@glennnel3570]

What a sage - Well done. A GREAT presentation. Thank you.

[@thespectaclefactory]

You're welcome, we're glad you enjoyed it! -Haleemah

[@surendersingal2192]

Thank you sir, very informative n clear explanation. Today I am bit more selective on type of lens in my glasses. Good day sir.

[@thespectaclefactory]

My pleasure! Hope you'll stick around for more advice

[@AK-jdi]

Amazing video!! Absolutely what I was looking for. I had started to see color fringes from my new glasses and was quite disappointed. Realised now that they are polycarbonate 😓

[@thespectaclefactory]

Unlucky! Are you going to change them for a better material?

[@akahina]

My prescription has remained about the same since I was a teen, and I am 68 now. (-4.5 to -5 with tiny astigmatism.) I have tried several different lens materials and a couple of different progressives. The aberations and unclear areas drove me crazy and I could not get used to them. Plus they always scratch regardless of coatings or what they tell you to sell them. (I am a photographer and lenses always get scratched from camera eyepieces.) I currently have a pair of high end progressives made by Zeiss. I do wear them but don't like them. For me glass bifocals are best. And I once even had an issue with glass. It turns out that the new lenses had a different base curve that made me queasy. I was told I was base curve sensitive. Now I will need all new glasses because I had cataract surgery 3 weeks ago on my right eye, left eye in a few days. My new prescriptions will be about -2.5 to -3. I will get glass for photo work and likely non-glass progressives for my fun eyewear. I just wish they could do away with those blurry aberations. Any suggestions for progressives for someone like me? And I want photochromic glass for my work glasses. I hope the photochromic part is in the glass and not another scratchable coating.

[@thespectaclefactory]

You should have a very hard time scratching any glass lenses. Based on your preference for bifocals, you need Zeiss Individual with NEAR bias and FRAME FIT of -1.00 This is crucial as the lens can be tailored to your preference, but most opticians don't do this. We can do it for you, if you like

[@danielch6662]

akahina missed the opportunity to get multifocal IOLs. In fact, search KZbin and you'd find opthalmologists who have gotten their natural lens replaced with IOLs even though they didn't have cataracts. The object being to remove the need for glasses altogether. There are multifocal premium IOLs like panoptix and synergy, as well as EDOF IOLs like vivity. I myself avoided the need for bifocals by the old tech way of monovision. Perhaps one day, the way these new IOLs are made, the tech would filter down to eyeglass lenses.

[@TheHi-T]

Trivex was recently recommended to me for sport frames. Optical clarity, durability, & could be used in prescription as high as minus 8.00. (Thank goodness my prescription is not that high). I haven't been able to confirm if that is true.

[@thespectaclefactory]

Yeah it's great for sport, although could be thick in most wraparound sports frames. I usually use 1.67.

[@robert15john]

I’m amazed that most lenses today are still made from a material that was invented around 80 years ago ! Wow! That really surprised me !

[@thespectaclefactory]

Me too! Our industry is very resistant to change and doesn't embrace new technology easily, which is one of the reasons we stand out

[@nef36]

Well, if you were using glass lenses, then they'd be using a material invented a few thousand years ago.

[@jeanli4351]

That's a very informative video! I learned a lot. Could you let me know the name of the app demonstrating the thickness of lenses at 9:17 please? Thank you!

[@enriqueparedespinel1694]

The best info vid ever about lens materials. Now please on sunglasses.

[@thespectaclefactory]

Thanks! And I'm sure that'll come eventually. What points would you like me to cover?

[@mostguitarswins]

Great video! Have you also done one that explains the relationship between prescription and lens index? I'm wondering how to determine the optimal index for progressive lenses.

[@thespectaclefactory]

There are so many variables that it would be really hard. Best to let your optician determine that for you I'd say

[@MixManik]

Setting aside the issue of fragility (brittleness), everyone agrees that glass lenses are thinner, tougher (much more scratch resistant), and optically clearer than CR39 or Trivex lenses. But what exactly is the weight penalty? Given the same prescription (let's say an "average" one with an ADD of +2.50), how much more would the glass lenses weigh than CR39 or Trivex lenses? 10% more? 20%? 50%? I can't seem to find reliable data on this. It would be interesting to see a table or graph comparing the weights of different lens materials for prescriptions of different strengths. Do you know of any such table or graph?

[@berdoph]

Please respond to this! Anybody

[@bikr0]

You are impressive. I am 65 years old with -12.25, cylinder of -1.00, axis of 020 and add of 2.50. Left eye, -12.75, cylinder of -0.25, axis of 138 and add of 2.50. PD 31 for each eye.. Any suggestions on a lens and type of frame would be appreciated. Again, thank you for your very informative videos.

[@thespectaclefactory]

Hi, I offer bespoke advice via email or video call. And I'd love to help you choose a great pair of glasses. Just email me via [e-mail] And thanks for the compliment 😊

[@debashisray4265]

Excellent presentation of the basics. One omission. How do they react to mineral oils? Working with engines my fingers, constantly have a film of oil.

[@jiayanglian4363]

Hey Robert, I do thank you and I must say NOT everyone and not every optometrist is like you giving out all the answers. I am in Australia, from my own experience, optometrist check your eye and give you a prescription, then the optician dispenser takes over and they almost never tell you that much details. is that the same over in UK ? or you are the optometrist and the dispenser all in one ? I do have some interest in lens design , what is a SPH, ASPH and Double spherical. Also when the dispenser asks if you rather have stock lens or Rx lens ? stock lens are also Rx isn't it ? why Rx lens cost that much more than stock lens ? which is also Rx prescription? I feel like the more of your videos I watch I discover I might not be able to get the same amount of transparency here in Oz land. I do hope you see this comment.

[@thespectaclefactory]

I guess we are pretty unique as people visit us from all over the UK and internationally as well via video call. I never wanted to do optics the way everybody else does it, and I'm always looking to educate clients as much as I can because I truly believe if they understand what makes a great pair of glasses, they will choose us every time. Hard to answer your Q simply, but a stock lens is ready made and therefore not as optimised as it could be, and obviously not customised in any way. The problem is that if you take that stock lens and move it further from your eye, or tilt it relative to your eyes in any direction, it can significantly affect the focus. Now when you try on any frame, it will hold that lens in a unique way. Thus, unless you get lucky, you are compromising the optics. Now a lens being custom made doesn't automatically make it better. It depends on the level of technology integrated into the manufacturing process...

[@jiayanglian4363]

@@thespectaclefactory if I have prescription here, should I actually take a trip to go make a pair of eyeglasses properly or a prescription is all necessary? I do think I know the answer to that, but flying over to UK is not really a quick escape

[@Patspwnage]

How is Zeiss 1.6/1.67's acuity/aberration compared to CR39, for low scripts like yours?

[@bhuiyashkumar4916]

I have been experiencing color fringing in my new glasses and now I know why.

[@thespectaclefactory]

Happy to help!

[@River-iw1og]

I'm trying to choose between Trivex and high index 1.67 and a rep at Fuse lens is suggesting that Trivex is thicker but somehow lighter in weight than the high index 1.67. In my limited research, I'm finding that lens thickness highly correlates with lens weight for plastic materials. I have a strong Rx -6.75 in both eyes. What are your thoughts on this? Your video @8:45 mentions that high index lens are thinner but you don't explicitly mention the correlation in weight. My primary concern is weight because they will be for sunglasses used when running.

[@thespectaclefactory]

Tribrid is probably your best option - I believe it would be lighter than both options. Trivex is indeed significantly lighter than 1.67, if the same amount of material is used. However, because 1.67 is thinner, it will probably work out about the same as Trivex in your prescription. Hope that makes sense. We'd be glad to make Tribrid lenses for you, by the way

[@Dom4z]

Is it only glass that comes in 1.74 index? Or does CR39 and Trivex also? I'm thinking of getting trivex 1.74 or glass if that's possible? Thank you man! I wish I was in your country, I'd come to you in a heartbeat for manufacturing of glasses. I admire anyone who is passionate about their profession and tries their best to explain and provide all the information for others that don't have this expertise. I do that in my field. Much appreciated 👍

[@stevec9669]

Can a High Index lens be made from plastic (lighter) or has to be made from glass (heaver)? Same question for the Trivex lens. Thanks.

[@chongthamgoutam2434]

Robert, please explain MR8 lenses.

[@giamademedoit]

Hello, what about crystal vs glass? I found some antique lenses and I need glasses. I am curious whether they'd do the job. Supposedly it's the best material. At some criteria...

[@martenmarkstrom9544]

Is it always best to have as large index as possible? Or is it unessesery if you have for exempel just +3 ?

[@andreknudsne7648]

My vintage frames from Cartier from around 1990s they uses Mineral glass lenses, how can that be? CR39 would be a better choice at that time ?

[@thespectaclefactory]

No, optically glass is almost always better. You find that premium sunglasses often have glass lenses for this reason, as well as scratch resistance.

[@falcon-1999]

I got new glasses and they are polycarbonate but it seems off, it's like looking through a magnify glass. I was thinking about getting plastic is that a better choice?

[@GreatIaker]

This is a really good explanation. Thank you! My vision is around -9 with minor astigmatism, so my prescription glasses are 1.74 High Index. Fortunately I do not really notice chromatic aberration or purple fringing. For outdoors I often wear contacts with sunglasses. I like Serengeti Driver glass lenses for driving & casual wear, and Rudy Project Trivex or polycarbonate for sports. Are you familiar with TAC Dura Lenses? I see them advertised in low priced sunglasses, so I am guessing they won't compare well to Trivex or polycarbonate. Thanks again.

[@thespectaclefactory]

You're welcome 😁 But I'm sorry! I do a lot of research and haven't heard of TAC. I'll check them out.

[@nonzerosum8943]

@@thespectaclefactory Are there other "scratchless" lenses? And why are rimless eyeglasses so much more expensive, at least in my research. Can you have ½ rimless eyeglasses with nylon cord converted by attaching with a screw? Excellent video compilation to The Spectacle Factory 👍

[@Thunderdance1000]

Thank you so much for this very informative video. I was completely ignorant to types of lens materials and have suffered with poor quality lenses. I'm am now on my third pair I can't wear and I'm incredibly frustrated. My last pair prior to this round of needing new glasses was perfect for me. Due to moving to another state The optician that fitted me with that pair is no longer accessible. My problem is my glasses are way too heav a very uncomfortable and I've educated myself about frames and thought I need to know about lenses and that is when I found your video. I have a very significant basic matism and I'm not sure how that impacts lenses and which lens would be best for that purpose? My eyes are extremely sensitive to change and the old optician told me I see the world very differently than most of us because of the degree of insignitism I have. Is there a recommendation that you have for my lenses and would you still recommend trivex?? The big problem is how heavy they are. I will find out tomorrow what type of lenses I have in them. Is there a number to your store that I would actually be able to call to ask questions if you are willing? I live in Southern California and I am really having a hard time finding an optician that has any true knowledge base at least in my area of Southern California. And he recommendations for that? Thank you so much again for the informative video and I am sincerely appreciative for the information you provided. Melody P.

[@irinasegovia4900]

Excellent video. Thanks so much for this useful information. For low prescriptions (

[@thespectaclefactory]

Yeah, CR39 is great for low prescriptions (as is glass)

[@irinasegovia4900]

@@thespectaclefactory Thank you!

[@Amiska5v5]

I cannot choose which material to get when I order glasses at my optician. I have +5.25 and would like to get Trivex, but not sure if Trivex even is avaliable for my prescription. What manufacturers have Trivex? Maybe tribid would be better for my prescription

[@MartinNeep]

I think Trivex typically has a refractive index of about 1.53. With your prescription I think that might result in quite a significant magnification of your eyes. Can you stretch your budget to a 1.74 index lens? Zeiss lenses are lovely!

[@thespectaclefactory]

Tribrid (thinner trivex) might be a good option if you are thinking about rimless or semi rimless frames and optics is your priority. Alternatively I would probably go with 1.67 or 1.74.

[@anubhavpanda06]

Fantastic video very informative👍

[@thespectaclefactory]

Thank you! Happy to help 😀

[@mikethinks]

Would a lens made of a higher refractive index require a more precise grinding/shaping effort to make an accurate prescription? Seems to me like a combination of a very high refractive index, along with less than perfect manufacturing, would lead to a less satisfactory result.

[@danielch6662]

Our tech level is way past that. What you describe would only happen at the worst possible factory. And they would still screw up normal glass lenses.

[@cinematographer6462]

CR 39 has good abbe value so if you have good anti scratch and anti reflective coating , it seems good option ? Is it possible to engineer that ? Is high quality CR 39 lenses available in market?

[@thespectaclefactory]

Yes, CR39 is available with every lens technology that I know of!

[@dariusjohn66]

great video thank you👍👍

[@thespectaclefactory]

You are so welcome! Happy to help 😁

[@martink1519]

Hi Robert, great vid! May i ask what glasses you are wearing in this video?

[@thespectaclefactory]

kzbin.info/www/bejne/q2TbooN5Ytdne6c&

[@george-ld4gi]

Hi Robert. It's been five year that I'm wear varifocals and still can't tell which lenses are better. Tried Hoya, Essilor and Nikon. I've noticed that you are more into Zeiss. I would like to know if Zeiss a much better choice. Faithfully, george

[@thespectaclefactory]

Hi George, it's quite subjective and different people prefer different brands. I prefer Zeiss for their innovation over the last few years which isn't matched by others, and most of all the ability to incorporate i.Scription technology.

[@shaf3006]

hi, Me too have this question lingering for a long time, since 2005 to be exact, I’ve been wearing essilor varifocal lens and would like to try others but my optician told me if I am comfortable with it better not to change, Here in Malaysia it’s a common practise that the optician will do all the eyes test and only serious case that will be refered to an eye Doctor, I am 60 years old comparing the last prescription , 2017 and the latest which is a week ago left eye Sph from 0.75 now 1.25 , the right eye remain unchange at 1.25 , rigth eye cyl from -0.25 to - 0.50 and the add remain at 2.25 for both eyes since 2017, does this mean that my eyes are ok and stable ? Tqvm

[@surebet146]

I have recently had my eyes tested and received the prescription from optician, after receiving my glasses I decided to check the glasses via an online scanner tool to see if the scan tool prescription matched the test done by the optician. The SPH and CYL measurement from the scan tool were very close to my prescription however the AXIS measurement on the scan measured 140 on the right eye whereas the reading on my prescription showed the AXIS measurement of 140 on the left eye. I then proceeded to check my previous glasses against my previous prescription and the same thing happened, the AXIS reading on the scan tool appears on the opposite eye compared to the prescription. Can anyone explains why this is or is it possible my glasses are being made incorrect.

[@thespectaclefactory]

Unless you have a reason not to trust your optician, I would expect they are far more reliable than online measuring tools. Of course it is always possible that a mistake was made. You should speak to your optician about it. Let me know what they say!

[@danielch6662]

Alternatively, go get your prescription measured at another optician. Walk in WITHOUT your glasses. Tell them you didn't bring it. Tell them you just need a prescription. You're not having glasses made. They might charge a small fee to do the measurement. If they ask why, tell them. I have had my prescription measured and then used it to order my glasses online, because online they are about US$7-12 per pair, inclusive of frames and lenses. The optometrist kinda looked at me funny and asked why I wanted a prescription but no glasses made. That wasn't normal. So I told her. I usually order 2 or 4 pairs for myself, and gather as many other orders as I can collect from friends and family and put them all in in one order. Shipping can be expensive because I live 40% of the way around the opposite side of the planet, but by making larger orders shipping is minimised to about 20-30% of the glasses themselves. I still come out way ahead. I'm -6.75 and -6.50 and at that level, I used to get slaughtered every time I needed new glasses. The cheapest these days "offline" are about US$500-700 where I live. For less than 10% of what I'd pay for one pair, I get 4 pairs for glasses. I was charged a nominal $5 for the prescription. Another place to get it would be at hospitals with eye doctors. Tell them you only need a prescription, you don't really need a consult, and book a time to get it measured. These would normally be measured by an optometrist rather than an opthalmologist. Make sure it's not the latter, or it might be more expensive. In my country, government hospital's fees are very low so that is another alternative. But queues are long. I'd rather just pay $5 to skip the queue.

[@Gyroso]

Hey i recently bought zeiss photofusion x with drivesafe glasses, how do i know from what material it has been made?

[@thespectaclefactory]

The lens will be laser engraved on the inside

[@jayjenkins7747]

I ordered some silhouette rimless glasses I have a really mild prescription -0.50 or +0.50 with prism as well apparently my optician got them on polycarbonate would u still recommend I get it in trivex?

[@Fireneedsair]

Would you say glass is about twice as heavy as plastic? Can glass be done w high index? I’m a -6.25 in both eyes. Thx for the great videos btw

[@thespectaclefactory]

more like 4 times. But I think you could get an amazing result with high index glass. Like, perfect if we also chose the right frame

[@ebinstechroom]

Hey! My prescription is -2.5 on the left and -1.5 on the right eye. I went to pick out some lenses today and they told me the standard Crizal Saphire lens had a 1.59 index (which I believe is polycarbonate), I told them I wanted a higher index lens and didn't mind the price, but they said I won't notice any difference at all and it would be a waste of money for my prescription. My question is do you think I should get a higher index lense like 1.67 or 1.74? Aside from thickness will I be able to notice any difference in clarity for a higher index lense with my prescription? I'd like to get as clear vision as I can regardless of the price. Thanks for your help! Much Appreciated!

[@thespectaclefactory]

Well polycarbonate has the worst optical clarity of any lens material, so if clarity is important I would go for high index glass as I suggested in the video. At the very least, switch to 1.6 material which would have improved clarity and similar thickness. Also, it's not just the material which is important but other factors too, such as how you were measured for the lenses and the lens design itself. What type of lens have you ordered? Crizal Saphire is simply a coating and not a lens type.

[@ebinstechroom]

@@thespectaclefactory Thank You Sooo Much for your detailed response! I haven't ordered the lenses yet, but I will order a high index lens (atleast 1.67), not sure what type of lenses they are though. What specific questions about the lenses should I ask them to know what type of lens it is? The shape of the lens is a rectangular shape with slightly rounded edges. I am going to have my eye exam in a few days before ordering from the same place. But wanted to get all the information I can get before I order the new lenses and frames.

[@faultyillustration3197]

If someone's had a really bad reaction to the abberations with poly lenses would you still recommend trivex? I'm stuck between forking out to try trivex or gambling on the next company's anti scratch coating for plastic lenses (as I've just had two sets of lenses marked for defective scratch coating)

[@thespectaclefactory]

Yes, but although material is important the lens technology is also important. Make sure you get lenses from a high quality brand

[@lokesh152]

Hi, i need some urgent reply, as I am going today to buy. I have progressive with cylindrical numbers 3. Need suggestions from below: Zeiss Photo fusion X or Energize me progressive or Progressive superb

[@thespectaclefactory]

All of those things can be combined... it's not an 'or' question. Energise me is for contact lens wearers.

[@joheward8307]

Any suggestions for thin lenses for very short-sighted in one eye and far-sighted in the other? Buying lenses is a nightmare.

[@w.s.antion2912]

which lens causes the wearer to have more peripheral distortion-- a high index 1.74 lens versus a 1.67 lens?

[@thespectaclefactory]

It's nothing to do with the material, it's to do with the lens design

[@mikilimitedchannel14]

What do you suggest about cheap acrylic lenses, are they OK to buy?

[@thespectaclefactory]

I definitely wouldn't recommend them

[@danfromnorth52]

Great video and thanks. I spent a lot of money on my last lens and in fact they had to be sent to Switzerland to be ground. They are very thin so probably a high refraction rating. However, the anti glare coating is wearing off in patches and I am also seeing my lens completely covered in micro scratches. I have always used the eye glass cleaning packets to clean my glasses as I wanted them to last. They are not even 3 years old. Am I doing something wrong with cleaning? Is it normal for anti glare coating to come off like this?

[@thespectaclefactory]

It's not normal but it can happen. It is less likely with higher quality coatings. Maybe check your warranty?

[@ikarugaxx3749]

Very informative. However, I still see Trivex as a better choice than Polycarbonate, for the contexts where Polycarbonate would be the choice, while I don't see it as a better choice than glass/plastic. Plastic is already tough enough and light enough, why lose colour quality to have still more lightness and toughness (unless you are in a security-glasses context)?

[@streetballer2906]

Still don’t know what high index lenses are made of, what kind of plastic and it’s properties

[@thespectaclefactory]

How do you mean, what kind of plastic? Each is its own unique monomer

[@streetballer2906]

@@thespectaclefactory plastic is a blanket word, CR39, polycarbonate, trivex are all specific kinds of plastic, but everywhere I look I always get "high index lense are plastic" and thats it, never know if they harder than cr39 or poly, or any other properties of that type of plastic

[@stevesmith866]

it might be sad to YOU that many of the innovations that people enjoy today were born in military applications, but not me . I'm thankful.

[@thespectaclefactory]

It wouldn't be better if conflict wasn't involved?

[@SilentInTheTrees1]

I am ordering glasses now, usually get polycarb but am thinking of trying the basic plastic. I have +1.25 in one eye and -2.00 in the other. Do you think the base plastic would work for me?

[@thespectaclefactory]

It will work, but the lenses will look more equal with a higher index lens

[@prasanthgn]

Hi Robert, very informative video. Do you know if I could get zeiss drive safe in glass material? Or do you suggest non glass. 1.5 prescription

[@PneumaNoose]

I feel like you’re the eye guy for the Halo games. That music lol

[@vishnukm430]

Is there any way to get same spetacle you wearing in this video

[@thespectaclefactory]

No, I'm sorry. But if you email me via [e-mail] I can find you a very similar frame

[@a.r.2024]

Robert, what is your take on Nylon (polyamide) lenses (abbe 52)?

[@garyzimmerman6367]

Great video! One question though. What material are high index lenses made from? Thanks

[@thespectaclefactory]

I don't know what the molecular chemistry is but I do know that Sulphur is the main ingredient to make them thinner. They are a plastic monomer

[@garyzimmerman6367]

@@thespectaclefactory thanks, that’s what I needed. Also, have you heard of an eyewear brand called Lindberg? I’m I’m traveling to Santa Fe, New Mexico (about 60 miles from where I am) in two weeks for a LaFont eyewear trunk show and they mentioned they have Lindberg frameless eyeglasses. I was wondering if they were any good.

[@xl5man]

@@garyzimmerman6367. I have had a pair of frameless Lindberg glasses for 10 years and they are as good now as they were when I bought them .. only having to change them because my prescription has changed .. really good glasses

[@edwardinho6185]

I need -7.25 lenses in my left eye and -6 lenses in my right eye. Do you recommend 1.67, 1.74 or 1.76 lenses? Which will give me the best optics? Thank you.

[@thespectaclefactory]

It just depends on your frame choice. Probably 1.9 glass all things considered. That's what I'd have if I were you.

[@edwardinho6185]

@@thespectaclefactory Thanks for your reply. I tried glass in the past but found my frames were uncomfortably heavy. I normally go with 1.67 plastic. Is the ab worse with 1.74 and 1.76 than the 1.67?

[@thespectaclefactory]

@@edwardinho6185 In that case I'd go 1.74 or even 1.76 as you won't notice too much difference in optical clarity between the 3. Just go for a smallish frame

[@edwardinho6185]

@@thespectaclefactory Thank you.

[@edwong4178]

What qualifies as a “strong prescription” though? -3.0 doesn’t seem strong compared to -6.0 and most articles I’ve read suggest 1.67 for anywhere between -4.0 and -8.0.

[@drkesrf]

Great information !

[@thespectaclefactory]

Glad it was helpful!

[@nonzerosum8943]

Is polycarbonate the best scratchless lens ?

[@thespectaclefactory]

No, the worst.

[@mahmoodali6791]

Sir my number is -6.5 I am using glass lens can you tell me where I buy it good Glass material thank you

[@thespectaclefactory]

Sorry, I don't know? You can of course order from us

[@rohithkoushal5109]

First of all, thank you a lot for covering this topic. So most sunglasses materials have this lens made our of polyamide. Is it any better than polycarbonate?

[@thespectaclefactory]

Are you sure about that? I hadn't heard of PA lenses before

[@rohithkoushal5109]

@@thespectaclefactory i recently bought 2 Gucci glasses and in the description of the lenses I saw them mentioning lens material is polyamide

[@bobbg9041]

My wife looked, where do you buy these Trivex lenses? They told her her prescription was too strong.

[@newpeupyoass]

I keep coming across the term Nylon in plastic lenses. Is that another material, or just another name for polycarbonate or CR39?

[@thespectaclefactory]

It's a cheap material exclusively used in non prescription sunglasses

[@cosmoguarriellojr3479]

Hello, my name is Cosmo Frank Guarriello Jr. Im looking for big frames, glass or trivex lenses and I also want to do a eye exam., the size I'm looking for is 60-18-150. The lenses I want are glass lenses or trivex, brown transitions the latest tech, 2year warranty, super hydrophobic, scratch resistant, UV protection, blue light, anti fog, durable, anti water, anti oil, anti smudge also very important I want thick lenses not shaved down or thin, very thick is what I want. Which one do you recommend for what I want?

[@thespectaclefactory]

I'm sure I could help. We can book a consultation or discuss over email... contact [e-mail] and we'll work together 👍

[@NicolaColston-t4r]

How scratch resistant is Trivex? Good explanation

[@thespectaclefactory]

Depends on the coating.

[@Icantfindagoodname.]

Please could you answer my question I got a Polycarbonate for my glasses and i dont like it because pf the colour fringing how to fix it

[@michalpytel496]

Hi, what about Nylon lens?

[@thespectaclefactory]

Nylon is a poor optical material, generally speaking

[@dianetscherne1348]

I'm in the market for a high quality sunglasses . I am going with Randolph Eningeering for their optics and of quality of thier frame s . Would you personality choose glass over cr-30 ? Also would polarized lens help with astigmatism ?

[@thespectaclefactory]

Yes, I'd always go with glass for high quality non-prescription sunglasses, unless used for sport. Polarised lenses don't help with astigmatism, but they are great for driving and some other activities. Did you see my video on polarised lenses? kzbin.info/www/bejne/qKiVYoJ7Ytl-d5I

[@thespectaclefactory]

Randolph Engineering are great by the way

[@stan8926]

What is Mitsui Resin (usually 1,6 and 1,67 index)?

[@thespectaclefactory]

That's high index plastic, which most of the major lens brands use as their monomer

[@stan8926]

@@thespectaclefactory Where does it sit in relation to CR39, Polycarbonate and Trivex?

[@BaBaDoo0]

What’s the name of that software? 🙏

[@thespectaclefactory]

Zeiss VisuStore

[@koskey06]

Is there a way to stop the way my glasses will distort the image? Like a doorway will look bent at the bottom, or when I hold my t shirt in front of me it looks like a belly shirt. Hard to exolain, but was told there is nothing they could do about it. My eyes have adjusted so it don't make me feel sick anymore and I'm not tripping up steps when looking down, etc. But still annoying to have to take my glasses off to see the true size of something or if it's strait or not.

[@thespectaclefactory]

Yes, that's to do with your prescription, the lens quality and the lens alignment. If all three are correct you shouldn't get distortions

[@blessedhappycatlady]

Hello, I've just found your channel and subscribed! Very nice detailed clear video on different lenses! My question is this. I ordered rimless titanium glasses from Zenni Optical. It is my first time ordering online glasses...it's hard for me to pick glasses out online, but I did because their so much more affordable than the Optometrist office. My question is, with titanium frames in rimless style, can they be adjusted at all? Like on the temples? It seems like every pair of glasses I've ever got are way to tight on my temples and seem crooked! Can theses glasses (when I get them in the mail) be bent at the temples to loosen them up so they won't be so tight? Or what if their crooked? Can they somehow be bent into shape to straighten them up? Or do titanium glasses simply stretch and fit perfectly? This is my first pair of titanium glasses and I know NOTHING about them! I don't want them to squeeze my temples and I want them to sit on my face straight! Also, they won't look right digging in my temples! I hope you can help answer my question..thank you so much in advance! I hope to hear from you soon!

[@thespectaclefactory]

There are so many variations of titanium frames, and that's why there are big price differences. So it's a hard question to answer without knowing the exact model you have chosen. However, titanium glasses do usually have to be adjusted to fit securely just like other frames. In fact, the fitting can be even more important because they are often so lightweight that there is no natural grip to your head...

[@blessedhappycatlady]

@@thespectaclefactory Ok, thank you for replying.

[@pippopippo6465]

I would like to know if (leaving out the aesthetic aspect) for better peripheral vision (myopia) a thinnest (1.74) material is better or whorse than a thicker (1.6) with a better abbe index? Many thanks

[@HP-in8pl]

Is High Index 1.67 worse than Trivex? In terms of clarity, that is.

[@thespectaclefactory]

Yes.

[@rohanagarwal3741]

I am from India my eyes power are -6 in both eyes. I was planning to go with 1.61 becouse of my budget.. can you pls tell me where I can see 3D view of reflective index.... Here no body knows about 3D feature

[@salarafsharsa]

Hi, My name is Sal and I have a family owned optometry in California. I am a fan of your videos! I see that you use this software and i would like to implement that in my store. We are a Zeiss affiliated lab. Could you please tell me the name of the software you use and how I can download it? Thank you!

[@thespectaclefactory]

Hey Sal, it's called 'Visustore'. I thought all Zeiss opticians had access

[@salarafsharsa]

@@thespectaclefactory Thanks for getting back to me! We are a new store so maybe we just have not activated yet, I will check in with my Zeiss rep.

[@skywatcher6064]

I just got new glasses, I always order Hi Index 1.67. My new lenses are the same shape as my old ones and slightly smaller. The new script is only slightly tweaked on left sphere compared to the old script. Heres the thing, the new lenses are much thicker by more than a millimeter. I asked the manager at the optical shop , whom was not familiar with my prescription or my order, what she believes my lens material to be. She looked at them and answered , polycarbonate. She then looked at the lab work order and showed me the order is Hi Index. How can a consumer identify lens material and be sure that they receive what they pay for ?

[@thespectaclefactory]

They can't, which is why it's so important that you work with an optician you trust.

[@skywatcher6064]

@@thespectaclefactory Thank You Sir

[@DarkPa1adin]

How about sapphire?

[@cosmoguarriellojr7822]

I want very heavy, very thick trivex, I also want very heavy, very thick glass, is it possible? Do I need to go with 1.5?

[@thespectaclefactory]

Yes, we can do that for you. Write to us on [e-mail]

[@rohanagarwal3741]

U talk about durability but didn't talk about strach and coting durability.. I am using ziess lenses from 2 years now I lenses coting is completely destroyed.. what we need is DURABLE COATING

[@Jenko4114]

So what lens material would you recommend for a rimless Cartier frame?

[@thespectaclefactory]

Depends on the prescription and treatments

[@SarangaVlogs]

Really helpful ❤

[@Geovvne]

polycarbonate for me the best always

[@ornamualem6561]

Zeiss AdaptiveSun is made from trivex ?

[@thespectaclefactory]

No, 1.5, 1.6 or 1.67

[@ornamualem6561]

@@thespectaclefactory And the PhotoFusion X ?

[@ahmedmoh.2775]

I really hope you get my question and help me decide as u r the only expert to trust online.. What are the materials used to make ziess lenses smartlife blueguard dvp regular and individual ? It comes with 2 indexes 1.6 and 1.67 but they don't mention the materials used or the abbe number so i hope u can help me with that

[@ahmedmoh.2775]

Reminder 😢

[@bpark10001]

You don't mention that Abbe value drops the higher index you get. High index glass is a bad as, or worse, than polycarbonate!

[@thespectaclefactory]

Abbe isn't the only measure of clarity. Also, it depends on the quality of the glass.

[@bpark10001]

@@thespectaclefactory Abbe IS NOT the measure of clarity; it is a specific measure of how LITTLE the index of refraction changes over the visible light band. If you look at charts of optical materials, as the index is pushed up, the Abbe number goes down. That's why the high-index material are better used for prism "suncatchers" than optical lenses.

[@curlyhairdudeify]

3:47 All of my lenses have being made from polycarbonate... Then, I decided to save money, and get plastic lenses. I had them put on a semi rimless Tom Ford titanium frame. The lenses started to crack in a few months first on one lense, and then the other.... Past warranty. The crack started on the top of the lense were the metal part of the frame slids into the lense channel. The most ironic part is how the cracks on both lenses are symmetrical; same location.

[@sareema298]

u r amazing .

[@thespectaclefactory]

You are!

[@sareema298]

yes u

[@saleban1]

Good explanation but that sound track made video unbearable to listen to.

[@ostadkaar4763]

l lie it thanks

[@dasfahrer8187]

Why is it sad that innovations come from military breakthroughs? Most tech comes from there. Most products and materials we use every day to make our lives better comes from there. Be thankful we have smart people doing things that further humanity.

[@2Bluzin]

Because it would be better if we didn't have wars in the first place and a military industrial complex that results from that. Great innovation from space exploration has given us many things to make our lives better and it didn't involve making weapons of war. But unfortunately, war has always been a part of human history.

[@junkname9983]

I clicked on this video to get the details of the high index lenses and you basically blew it off and say it's too much information... What a waste of time.

[@thespectaclefactory]

Sorry to disappoint you. That wasn't my intention

[@borountree4539]

Your videos while educational are also infuriating because I cannot find anywhere that will allow me any choice in the matter. I pay for my own glasses but they all say with a -8.75, bifocal and astigmatism you get polycarbonate. End of story. They act like I'm crazy when I inquire about options and indexes.

[@thespectaclefactory]

That's so sad 🙁 Polycarbonate is probably the worst option for you. We do ship our eyewear all over the world, so I would be glad to help you in future