I'm worried because my eyesight is poor.

I am currently wearing glasses.

When I measure my eyesight without glasses, it comes out to about 0.3 to 0.4.

But I went to the optical shop to get new glasses earlier, and they said my eyesight is really poor.

Even when I go outside and feel a little uncomfortable, I can still get around well without my glasses.

What should I do to prevent my eyesight from getting worse?