cataract

1. N-COUNT Cataracts are layers over a person's eyes that prevent them from seeing properly. Cataracts usually develop because of old age or illness. 白内障

In one study, light smokers were found to be more than twice as likely to get cataracts as non-smokers. 一项研究表明，轻度烟民患白内障的比例是不吸烟者的两倍以上。