Hello, thanks for inquiring. Please visit chadwickoptical.com/contact-us/ and we can help you find a doctor near you.

Hello, tinting is a fairly complex process, and there is a certain amount of variation in the mixing of various dyes, and how the dyes react with various lens materials and coatings. Reach out to us through our website and we’ll attempt to help you further.

Thank you so much John. Glad you found it entertaining!

Thank you John!

Hello, I'd recommend reaching out to Dr. Caguoia at the Asian Eye Institute

@@HelixPrecisionMachine-nb2br Thank you for the info.. God bless..

John: Thanks for sharing your opinion that it “doesn’t work.” It seems that you’ve built it on some interesting assumptions. I am curious how you calculated the parallax ratio, and also where you arrived at the assumption that the person would be looking at the camera vs past the camera. Can you elaborate?

@@charlessaccarelli874 Then, you can use two credit cards on top of each other with a distance of 15mm between the two cards. I myself use a stack of printer paper to offset the second credit card by 15mm. Then you take a picture with same phone, same lens, same distance from the camera (40 cm). And you analyse the edge size of the two cards in the picture two see the parallax ratio.

@@charlessaccarelli874 The parallax depends on the phone's camera lens. But in all cases, objects farther from the camera appear smaller in the picture. If you put a credit card on your forehead and another one on your pupils (if that was possible), the first one would be larger in the picture because it is closer to the camera. You need to know the distance (depth) between forehead and pupils. I measured that distance using a 3D scan model of an average man and found that's around 15 mm. Then, to measure parallax ratio caused by a 15 mm offset, I put two credit cards on top of each other, separated by 15 mm (I use a stack of printer paper to separate the cards). I take a picture of the stack, using same phone & lens, at same distance as when I take PD measurement selfie, i.e. ~40 cm. I measure the resulting length in pixels of the two cards in the picture to get the ratio. In my case (phone dependent), I got 584.5 pixels and 565.8 pixels, which gives a ratio of 1.033. -- I don't assume anything, but you need to give clear instructions on where to focus when taking the picture. If you take a selfie while looking at the phone's lens, your are converging your eyes and focusing at ~40 cm, which is the average reading distance. That means your eyes are closer to each other. To get a picture of your "distance PD", you need to be focusing on a point located at a distance of 20 feet or more. You can however extrapolate the distance PD from near PD by adding a few mm to the measurement. That's what many apps do.

@@johnfr2389- thank you for clarifying. As I responded to a previous commenter, this was quickly put together during COVID in response to a whole bunch of inquiries of “how do I get a PD measurement?” I still feel it was better than nothing, but I’ll look into taking the video down. Looking back at it, It hasn’t aged well. Thank you for your well thought out response.

Can the focal height be measured using this method?

Hello and thanks so much for your inquiry. There’s a chance they will help you, but it depends greatly on the issues that you’re having as a result of having a missing quadrant of vision. Please email us at [email protected] and we can connect you with someone who can get a deeper understanding of your case and how peripheral prisms may help.

Hello, please visit chadwickoptical.com and contact us so we can help you find a practitioner in your area.

I had stroke and HH and I'm suffering from dizziness.. what would be the cause of my dizziness? thank you..

@@marzsotero8132 all of my 7 year follow-up produced nothing but frustration with the dizziness. Dx as “idiopathic vertigo.” Frustrating. I guess I won’t be mountain climbing or tightrope walking……(stroke joke)

My vision still feels near sided with my prescription glasses though .

Rich, Thank you so much for sharing your experience! The brain is such an incredible organ, and every single stroke has it's own unique manifestations. Thank you for describing yours.

Hey Marie: thanks for your question. It definitely sounds like there’s more going on than homonymous hemianopsia. The side effects of strokes are incredibly complicated. Between the complexity of the brain, and the various different places in the brain a stroke could happen, I would say almost anything is possible. We encounter very few cases that are “textbook.” The good news is there are specialists in neuro-optometric rehabilitation that can help you maximize the function of the vision you still have. Please contact us and let us know your zip code at [email protected], and we’ll help you find a specialist near you.

Hey Mark: This method you’re proposing does sound like an improvement. Thank you. For some context, there was a bit of a scramble at the beginning of the pandemic to offer options, and this was something we quickly came up with to help people who were quickly forced into remote care. All the best to you and thanks for your comment!

Brother Kunal can we talk?? I am also facing this. Please provide your social Facebook link if you can bro. Please

AVM survivor here as well, September 12. I had craniotomy that left me with left side hemiplegia and hemiopsy 😶

Just turned 26 this year so yeah, me too a young hemorrhagic stroke and avm survivor

School house rock and your on your way to a star on Hollywood boulevard.

Any idea to get this glasses in malaysia.lm suffered stroke and lost my visionfield

I see what you did there

Not stupid at all, the brain's visual system is incredibly complex and still not fully understood, and when it malfunctions it can cause a multitude of different effects, not all of which have been identified and named. For example, in all the descriptions of hemianopia I've seen the affected side of the visual field is shown as either totally grey or black. For me, the affected side behaves more like the 'blind spot' that everybody has because there is a small part of the retina where the optic nerve connects and no visual input is taken in. You don't normally notice it because it's in a different position in each eye and your overlapping fields of vision allow the brain to fill in the missing part from each eye with information from the other. If you close one eye you can deliberately move a small object into the blind spot and it will disappear, however you won't see a black spot in your vision, your brain fills in the area with whatever it expects to be there, so if there's patterned wallpaper behind the object your brain will fill in the pattern and y0u'll just see continuous wallpaper. My vision treats the affected side of my visual field exactly the same way. I subjectively experience a complete visual field but I can't see any changes on the affected side and if I move my arm or someone walks into the affected side I can't see it, but I still 'see' the background. I think it's like the way that if you see a cow from the side, your brain doesn't experience seeing half a cow even though that's all you can actually see (unless you're Damien Hirst). Your brain is constantly building a model of the world around you using whatever information it's getting from your senses, memory and knowledge. This can go wrong in all sorts of interesting and unique ways, a very small number of which have been named or understood.

@@chadwick-optical Disn't see your reply before I replied, good to know that it is a recognised condition, getting a name for whatever ails you is often a vital first step in getting treatment or developing coping strategies.

Shannon Strickland what would you like to know?

Where are you located?