Why does your eyesight deteriorate at different levels? How is it that you need higher grade lenses or have a higher level of astigmatism for one eye when you don’t normally use it more than the other?

Question

Why does your eyesight deteriorate at different levels? How is it that you need higher grade lenses or have a higher level of astigmatism for one eye when you don’t normally use it more than the other?

In: Biology

Answer 1

Very generally, things can go wrong. If that happens in the one place and not in the other, then you have one affected eye. When you need glasses, both eyes are deformed, because of growth/habit whilst using both eyes. But often, events occur locally at one site in the eye, causing something, so it doesn’t affect the second eye. Like when you break your left leg, but not your right. You walk with both, but break only one.

Is that what you meant?