ELI5, how do your eyes and brain adjust to new eye glasses or prescriptions?
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Eye glasses correct the incorrect refraction of your own eye lens refraction.
So imagine looking through a magnifying glass and you move it back and forth to get the best view. This is what your optometrist does when getting your baseline vision then asking you 1 2 or 3 a bunch of times. They are testing different angles of lenes to hone in your corrected vision with contacts or glasses.
Why are things sometimes so blurry at first and eventually clear and easy to see? How does your brain “fix” what your eyes are taking in?
Your eye is always bending light to give your retina and your brain the clearest possible image, and when something has affected your ability to get a clear image, the lenses of the glasses/contacts bend just the right way to correct the exact distortion that you have. Your vision is always being bent and distorted, and your brain takes that information and gets accustomed to perceiving it in the particular way it’s bent so that what you “see” will look as you expect. When your prescription is old you’ve gotten used to the world bending not quite right, further away from the right place on your retina it needs to be for a sharp image. Your brain has gotten used to processing that particular distortion so it doesn’t appear bent to your brain, but it does appear blurry. Getting a new prescription all of a sudden corrects that light bending to where it needs to be, and before you brain adjusts to it, things look a little bent in the middle of your vision. It can be exhausting on your eyes at first because the muscles that control the bending of your lens are naturally trying so hard to correct what your brain hasn’t started correcting properly yet. Let me know if i can explain anything better – not an opthalmologist but a neuroscientist
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