Excellent information. Thank you!

This video and narration is clear and easy to understand. Thank you so much 🙏.

Thank you!

This video is both helpful and succinct. Thank you, Craig Blackwell!

Hall Amy Jackson Sandra Thompson Thomas

The best explanation so far , Thank you !

Thank you so much❤❤

What I always struggle to understand is how can we tell which colours Protanoos or Deuteranopes. I get lines of confusion and how everything from red to green more or less looks the same to them but what colour do they see?

13:05 The lens defocus tells the eye where to focus, thus lengthening or shortening the eye in the process. The light doesn't tell the eye where to go, it solely allows the muscles of the eyes to activate, when the light is more intense the eye muscles respond more and shortens the eye. When light conditions are low, the muscles don't activate and this under-use lenhetens the eyes. A stronger light should therefor not have any particular effect in this myopic lens defocus because normal light conditions are enough for the eye muscles to maintain adaption to the lens. The more intense the light, the more the eye wants to shorten, but it cannot bypass the limitation of the focus. When the current focus is at emmetropia, the light will not further induce shortening and instead stabilize towards this limitation.

Thanks for your lecture

length characterstic of vehicle

Hi. Very informative vidoe.. my final year project is based on this and i'd love to read more about this.. is there a book you recommend to understand color spaces in general?

Ty!

Great vid!

Thank you very much for this video. I’ve watched nearly 30 videos on the subject. This one was the only one that satisfied me.

I first learned about vitrectomy about 20 years ago, and was horrified by everything about it. 2 months ago, I had a cataract surgery in my one eye with adequate vision which dropped lens fragments into the back of my eye, which caused my eye pressure to spike high enough to kill my optic nerve within a few weeks. Instead, a vitrectomy removed the lens fragments and thus halted my eye's self-destruct sequence. As a bonus, I also got rid of the countless floaters that have annoyed me my entire life. A month after the vitrectomy, I still have some visual acuity issues, but I'm not blind. The surgery which terrified me more than any other is now the surgery I value over any other. I'm sure there's some lesson to be found in this. 🙂

By

2 yrs of Avastin injections for Macular Degeneration caused what they are saying is irreversible scarring in my dad’s eye. Seems so oxymoronic that the medicine he went through 2 yrs of painful injections - actually now made his eyes scarred… and don’t know what to do now for him. He now is having troubles doing daily tasks and needs assistance with everything from bathing to eating. I feel like they experimented on my dad … Can he now reverse the scarring from Avastin? Feeling so sad and frustrated with the medical system. His eye is completely scarred from Avastin- what can we do now???

thanks so much

Beautiful: All normal eyes, control their refractive STATE , to THEIR AVERAGE VALUE OF ACCOMMODATION. A perfect scientific truth.

I appreciate you 2024

1 -4,000 people.

A wonderful help.

You are doing a great job.

Dr B;aclwell as a recently diagnosed glaucoma patient i found this video an excellent precis on the subject. Thank you so much for this!

This video taught me more in 15 minutes than my teacher taught me all year. Thank you so much! You just earned yourself a new subscriber.

Thank you for making this video. I've had a persistent detachment that hasn't responded to a buckle or a bubble, so I've just had a victrectomy to try and fix it. Your video helped explain what was done and why.

Hello! I have a hard time understanding the tristimulus chart. I thought the CIE diagram was based on the normalized responsivity spectra of human cone cells, not on the linear combination component values of a wavelength onto the 700 nm, 546.1 nm and 435.8 nm. Or are they the same thing? And why is the tristimulus chart negative? And why those particular wave lengths? Thanks!

This video is so good better than any movie

Dr blackwell can you be my attending in my subspecialty 😊

I love the cornea too craig

My ophthalmologist said there’s nothing that could be done about my vitreous floaters. I told her they are a nuisance especially when driving and she quickly dismissed me telling me that it’s normal and it’s not a cause for concern. When their clearly is procedures to treat floaters. She must’ve gotten her ophthalmology degree from dollar tree 🙄

I found this far more interesting and informative than most other videos that’s just go on and on.

Great video! Could you also add the list of references to the description instead of having those only in video as image?

Thank you very much! ❤

Excellent explanation. Thanks you !!

I have a question that I'm wondering if you might know the answer to. With regards to astigmatism, what might cause the distance to the test to change which direction the lines are blurry and clear? Close up the horizontal lines are more clear and the vertical most fuzzy, but when at a distance that is not say reading distance to perhaps a monitor and further away it's the opposite. So when further away the horizontal lines are now fuzzy yet the vertical lines are now clear. If it were the shape of my eye lens or cornea wouldn't they be the same or similar direction no matter the distance?

Ty for this video - this has helped me to understand . Now I just need those paralyzed to attest to having this surgery & questions I should ask .

“If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down. But I can find no such case.” Charles Darwin, On the origin of species. Evolution theory….in tatters.

Thank you very much, this material is very precious.

Thank you for the video & information 🙏

I’m interested to know more about the type of vision cows, pigs, and deer have, but I’m not surprised it wasn’t mentioned. He didn’t want to make people uncomfortable by showing that the food they eat sees the same world as them. Exceptionally too, as most mammals are dichromats.

Fantastic as usual.

Hi Dani, same experience n been thru everything u explained. i had pneumatic retinopexy n took 2 months 7 days to go away gas bubble

Christ, the FDA needs to hurry the hell up…. All these treatments are available abroad but not in the USA? Likely lobbyists messing up development like happens a lot here.

Vuety drops are a waste of money. Considering the active ingredient is available in 10 ml bottles and is an old generic drug pilocarpine hydrochloride ophthalmic solution. It’s “ok” but don’t try to drive at night . Since your pupil can’t dilate, your eye cannot increase the amount of light when there is less light available. Also, I had mono vision LASIK done and it was also useless. One eye is now corrected for distance, with the other set for near vision. My brain didn’t adjust and the near vision is wrecking my distance vision. It’s aweful as my eyes fight one another.

I had rt eye rhegmatogenous retinal detachment and had a vitrectomy surgery. Now am in 4th day post surgery. Keepingmy face down position to ensure the gas bubble stays put. I only sleep on my left side and all these for next two weeks or so.

You are the best for these videos. im a deutan studying my deficiency and these are the best sources for visualization and explaination

Most simplified

Thank you