How to describe poor/bad eyesight?

myopic, shortsighted, partially sighted, nearsighted

Thank you.
But the words you recommended are all in medical field. I wonder whether "Dim-sighted, Weak-eyed" are natural in English.

NL888 I wonder whether "Dim-sighted, Weak-eyed" are natural in English.

They are not. The words AS listed are.

Why the word sharp-eyed works, then?

NL888Why does the word sharp-eyed works, then?

Some work - sharp-eyed, clear-eyed, bright-eyed, dewy-eyed, doe-eyed, bleary-eyed. Others don't. That's just the way it is.

Weak-eyed is rarely used for strabismus ("wandering eye") in children.
Also, cross-eyed is a common malady

Having poor eyesight is a medical condition, so the terms are usually related to medicine!.

http://machaut.uchicago.edu/?resource=Webster%27s&word=dim-sighted&use1913=on

You don't see that much (no pun untended). It is in the Shorter Oxford without comment.

"Weak-eyed" is a legitimate formation. You can hyphenate "weak" with anything you choo

Also, purblind. But I didn't add it to my first post because I have not run across it before