How do I know if my eyesight is good without going to a doctor?

How many fingers am I holding up?

If you drink till drunk and still see the line straight on paper, you've got 20/20.

If you can read newspaper print without magnification and see details on objects at a reasonable length away I would say your good.

If you can't see well, that's how you know if your eyesight isn't good.

You can google and print off an eye chart. 🤓