He has severe myopia, so he can't read distant signs.
近視の人はメガネやコンタクトレンズを使うことが多い。
People with nearsightedness often use glasses or contact lenses.
Using a smartphone for long periods makes you prone to becoming nearsighted.
Recently, children's myopia has been getting worse.
I had my myopia corrected with laser surgery.
His nearsightedness is so severe that he can't see anything without glasses.