Here's my "organ recital," all about my visual organs: In my youth, my acuity was considerably better than 20/20. I could recognize a very tiny astigmatism in my right eye when looking at the horizontal and vertical slats on air vents across the gymnasium. Run-of-the-mill vision tests didn't go to that extreme. I was an example of the joke where the doc says "Read the last line" and the answer is "Printed by local union 71." Both of my eyes are 20/20 now, but my left eye got there through a long chain of events. Years before cataract surgery, I got a small foreign body in my left eye. My primary physician found it, but didn't tumble to the fact that it had promoted iritis. The irritation got worse and worse over a period of a few days, and in the resulting visit to an ophthalmologist I was prescribed some extra-strength drops (a type of cortisone? I don't recall) with the unfortunate side effect of promoting a cataract. My (years) later ophthalmologist was very conservative about doing cataract surgery before it was absolutely necessary, and I think she waited too long. I had repeatedly asked for it, but she talked me out of it until I told her I couldn't pursue my electronics hobby because my depth perception was too poor to solder wires (getting the wires, solder, and iron to meet at the same distance.) During surgery (2009), the natural lens broke out of the capsule and chunks went into the vitreous. This required implanting a lens in front of the iris (which is kept at the ready for cases like this), and a vitrectomy within a week. During the vitrectomy, they also laser welded my retina in place as a precaution. I can sometimes see the weld points as very briefly visible points of light when suddenly turning on the lights in a dark room. After the vitrectomy healed (on the order of a month or more, instead of the few days for a successful cataract surgery), I also got a laser iridotomy to prevent pressure buildup in the eye due to possible blockage by the anterior implant. If you look closely at my left eye, you can see the implant in front of the iris. I have noticed a reduced speed of adaption to extreme light level changes in this eye (being "dazzled" for a minute when going into the sunlight, and longer adaptation time to the dark), but no other deficit. The right eye surgery was done in an earlier stage of cataract progression, by a different doctor who was not so hesitant, and went perfectly. Picking the right diopter implant is difficult, both because of errors in measurement with the cataract in place and because the shape of the eye changes after surgery. I asked for distant vision in both eyes, since I was used to progressive bifocals anyway, but ended up with best focus at computer monitor viewing distance. It is not so far off that I am required to have glasses to drive. After successful surgery, I was able to return to my role as "golden eyeball" for video quality and coding artifact assessment in my work. -----Original Message----- From: colorsync-users <colorsync-users-bounces+waynebretl=cox.net@lists.apple.com> On Behalf Of Wire ~ via colorsync-users Sent: Wednesday, January 15, 2020 4:34 PM To: 'colorsync-users?lists.apple.com' List <colorsync-users@lists.apple.com> Subject: Re: Effects of lens implants on color vision (Was RE: Human color vision) Re UV coatings, I think that's distinct from anti-reflective coatings, a cheaper form of which produce the very striking blue reflection that some people find fashionable. Re cataracts, I've often heard of a link between UV exposure and cataracts. But like everything I found it's more complex... I developed a condition where as the eyeball changes shape due to elongation from muscle strain of strong distance correction for near field viewing (eg computer displays) the jelly in the eye separates from the retina and creates a horrible crippling form of floaters. For aging suffers of diabetic retinopathy (my late father) there's a treatment of replacing the vitreous jelly with saline and this can cure the problem as a nice side effect of the treatment. But it's been found that vitreous jelly has a critical effect inhibiting cataracts, and that you are guaranteed to require lens replacement within 5 years after a vitrectomy. The Doc said there is some science that suggests that its oxygen impermeability of the jelly, or rather it's permeability, that's crucial to the onset of the disease. Wonders... _______________________________________________ Do not post admin requests to the list. They will be ignored. colorsync-users mailing list (colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/waynebretl%40cox.net This email sent to waynebretl@cox.net