One of the things I've noticed after having cataract surgery in one eye is the colour difference between the "old" eye and the new lens one. The un-operated eye (which I was told does have some early cataract development, but is no where near the stage that it needs an operation) shows the world in what looks like a warmer light, whereas in the newly lensed eye things look whiter, perhaps bluer. The difference reminds me very much of that between a "warm" toned LED or CF house light, and a "cooler" one, with its crisper, bluer light.
The ophthalmologist said yes, a cataract is like a yellowing of the lens, not just a clouding.
So people with slowly progressing cataracts start seeing the world in warmer, yellow-er tones, and don't realise it. (Well, I didn't.) I see that this has been discussed in the context of famous artists who developed cataracts, too.
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