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
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?
Your issue here seems to be that you think nearsightedness/farsightedness naturally come from age. What happens often is that many people’s eyes tend to grow either too long or too short, which leads to near/farsightedness. This is not deterioration per sé; it is more like deformity. Your body simply grows the wrong way. The same goes for astigmatism and such. It is not caused by wear and tear. |||| Now, your eyes certainly *can* deteriorate. One example of this is that they become less able to focus in general; this means you get the worst of both near and farsightedness, and this is why bifocals exist. Another form of deterioration is cataracts, where the lenses of your eyes blur. The former comes from muscular strain, and the latter often comes from lens damage in your eye. These are often symmetrical and impact both eyes, as they *do* come from wear and tear. They are, however, usually not perfectly symmetrical as there is still plenty of randomness involved.
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