How good does your eyesight have to be to get through a learners license without needing glasses?

Answer 1

That depends on your local regulations.

Where I'm from, you have to have 20/40 vision or better. That translates to roughly +/- 1 diopter.

Note that if you can see fine during the day, you may have trouble seeing at night. It's a common condition called "night-time myopia", where your eyeglass prescription gets a little worse at night.

If you don't like wearing glasses, you can get more attractive frames with an anti-reflective coating or wear contacts. You could have dedicated "driving glasses", and get them with a mild tint. Tell your friends that "if you're serious about driving, you'd know that you should wear driving glasses" or something.

Safety first.

Answer 2

To pass a learner's license test, you need to be able to read a certain level of visual acuity on an eye chart. This generally means having at least 20/40 vision without corrective lenses. If you need glasses or contact lenses to reach this level of vision, you will be required to wear them while driving.