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.
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?
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. 🙂
May I ask how did your eye feel after the surgery and how long did you had to take time off for this surgery? i.e. thinking of when one well enough to go back to work (computer desk work) and how about driving? (I understand that recovery does take at least a few months). Thank you.
@@Jess-th9qe , my eye was achy for several days, and noticeably irritated for a couple of weeks. In my case there have been further problems with my cornea which have kept me from going back to work, but if these hadn't happened, I think I would have been able to resume work 3-4 weeks after the surgery. Of course, every case is different, so asking your doctor is likely to provide more useful information than asking me. 🙂 Good luck!
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???
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!
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 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?
“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.
How long does it take to start seeing again my dad had vitrectomy because of gel clumps no retinal detachment or holes . its been 4 days and he sees just white cloudy and is worried.
Hi it does take a week or two while.it settles, was it an air bubble or a gas bubble they used? Also does he have the floating bubble/line in his eye at the moment?
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.
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.
Spectral colors can be distinguished from a mixing of other colors when illuminating a color image. For example, the almost spectral yellow from a sodium vapor lamp will make a color photo look monochrome. The same photo illuminated by a mixture of red and green light will reveal red, orange yellow and green.
