What do you do at a eye doctor's appointment when you see if you need glasses?

i need glasses but i am wondering what happens to check if you need them
Answer:
My grandpa is an eye doctor, so here what happens
the doc will ask you some basic health questions like if you are diabetic, family history of ,, etc, since all will affect your eyesight.

then he will show you an eye chart, with letters and shapes,
starting form being large to very very tiny.
then there is an glaucoma test, where they will puff some air in your eyes,, and will give you a color vision test, to check your color vision,, (if not given ask for one)


that is pretty much it.

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You look through this machine and the doctor changes the strength of the lenses to test your reading of letters that are on a wall across the room. They then determine which lenses you think you see best out of.

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if you think you need glasses.you go the the optimetrist. there they do the whole "what letter is this" routine and then they do a further viewing inside the office. there they squirt air into your eyes to figure out the width of your eyes or whatever. they also see your eyes through a maynifying glass thing that looks like binculars and from them they make you see a picture and you have to say what it is. the pictures look like they're a mile away so they can test how far you can see. then they figure out if u need glasses!

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