Some personal observations on lens implant effects on color vision: Photochromic eyeglass lenses absorb ultraviolet and deep violet. Before I developed cataracts, they appeared to have a slight amber tint, especially noticeable in natural outdoor light, but also by placing them on a piece of white paper under artificial light. They would change the saturation and hue of blue skies. As my cataracts and lens browning developed, I lost the ability to see the amber tint, as everything was subject to an even stronger yellowish filter. After each eye received an implant (six years apart) it was possible to see the amber tint again in that eye. There is a choice of clear implants or UV absorbing implants. UV implants could be identified on the info card they gave you, as the type number had "UV" appended. I made sure to get UV absorbing, as I suspected they would most closely match my vision prior to browning of my natural lenses. This was confirmed in a striking way by a colleague of mine who accidentally got a clear implant in one eye and a UV absorbing one in the other. He had a beige winter coat of a cotton/synthetic blend, with pure synthetic knit collar. Viewing through the clear implant, especially in natural daylight, he reported that the collar looked purple, while it matched the main material much more closely through the UV implant. I verified his observation of only a slight mismatch with my UV-absorbing implants. I also noticed something about white point adaptation during the time I had only one implant. Even after a long time of adaptation in a given environment, closing one eye and then the other showed a definite yellow shift in the untreated eye compared to the one with an implant. I did not expect this, thinking that each eye would adapt to the same overall balance. Despite the difference, the sense of what objects in the field of vision were white was equally strong in both eyes. I take this to be an indication that the process of identifying white is separate from the process of seeing a white object as a particular color. (This yellow shift is gone now that I have implants in both eyes.) -----Original Message----- From: colorsync-users <colorsync-users-bounces+waynebretl=cox.net@lists.apple.com> On Behalf Of David Scharf via colorsync-users Sent: Tuesday, January 14, 2020 6:54 PM To: colorsync-users@lists.apple.com Cc: David Scharf <electronman@roadrunner.com> Subject: Re: Human color vision You'll finally be able to see violet again!!! DAVID SCHARF PHOTOGRAPHY *DAVID SCHARF * On 1/14/20 9:25 AM, Roger Breton via colorsync-users wrote:
Bob,
Call me nuts, but I'm actually looking forward to the day I'll have a cataract removed for the very reason you mention, that experience of looking at the world, all of a sudden, *without* yellow filters. I read the same account as you described, in the color literature, that the sky takes on a stronger vivid shade of blue and so on.
All I know about the Standard Observer is that it was made of two groups of men but I have no details on their age... I guess they had "normal color vision" 😊
/ Roger
-----Original Message----- From: colorsync-users <colorsync-users-bounces+graxx=videotron.ca@lists.apple.com> On Behalf Of Bob-BTY via colorsync-users Sent: Tuesday, January 14, 2020 10:42 AM To: colorsync-users@lists.apple.com Subject: Human color vision
Many people don't seem to know that the lenses in the human eye start going yellow with age. By the age of 50 most people are looking at the world through yellow filters! I experienced this when having a lens replaced because of cataract. The new plastic lens was clear, and when I came out of the operating room, I could see that the dresses of the nurses (that were grey/white stripes before) were now blue/white when I looked at them with the new lens. With the yellow lens in my other eye they were still grey/white! A blue sky was now qite vivid with the new plastic lens, not so with the old yellow lens. I played about with Wratten filters to see how yellow my original lens was, but sadly I can't find the details any more, and nnow have two clear plastic lenses. I wonder how old the 'Standard Observer' was?
Bob Frost
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