retinas arenāt damaged in cataracts. Itās a deposit near the front of the eye, maybe on the lens? That blocks light and makes it difficult to see. The retina is at the back of the eye.
I have done a lot of reading about full spectrum light, and if you are using one of those lamps close up to the bird, as recommended, for an Amazon only about 2 hours of that strong light a day is recommended (this is from a veterinary journal when I was researching whether to get one of those lights for my birds).
Many older people and animals have cataracts. Over your lifetime, the lens opacifies and the person or animal cannot focus. Itās not surprising that a 47 y. o. Amazon would have cataracts. It is a disorder of old age.