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. 白內(nèi)障

In one study, light smokers were found to be more than twice as likely to get cataracts as non-smokers. 一項(xiàng)研究表明，輕度煙民患白內(nèi)障的比例是不吸煙者的兩倍以上。