how do eye doctors measure your eyes for contacts?!

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iris dia and curvature

Usually, i sit on a chair and she asks me to read some numbers/letters of different fonts and whether i see them or not, she changes the measures until i can see.
Or, i sit on a chair and i fix my chin so that i can look into a machine that has an image. She tells me not to close my eyes and focus on the image and tell her when the blur's gone.

I've been wearing contacts for 5 years now.

They have have a machine with a lens for every level of eyesight imaginable from perfect to almost blind. They then put it on you and ask you which one is the clearest. Which ever one is the clearest is the level your eyesight is and they get you a contact lens with that same level. Same way they prescribe glasses.

I went to one before.