How to describe a man's poor eyesight?

For men, shortsightedness is described as seeing things like beans.

Eyes as bright as beans, China idiom, pinyin for mù guāng rú dòu, which means eyes as small as beans, describes shortsightedness and lack of foresight.

Idiom usage is subject-predicate type; As predicate and attribute; With a derogatory connotation.