Effects of lens implants on color vision (Was RE: Human color vision)
Effects of lens implants on color vision (Was RE: Human color vision)
- Subject: Effects of lens implants on color vision (Was RE: Human color vision)
- From: Wayne Bretl via colorsync-users <email@hidden>
- Date: Tue, 14 Jan 2020 19:22:51 -0700
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=email@hidden> On Behalf Of David
Scharf via colorsync-users
Sent: Tuesday, January 14, 2020 6:54 PM
To: email@hidden
Cc: David Scharf <email@hidden>
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=email@hidden> On Behalf Of
> Bob-BTY via colorsync-users
> Sent: Tuesday, January 14, 2020 10:42 AM
> To: email@hidden
> 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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