Astigmatism is a common vision problem caused by an error in the shape of the cornea. With astigmatism, the lens of the eye or the cornea, which is the front surface of the eye, has an irregular curve. This can change the way light passes, or refracts, to your retina. This causes ...
2024年公共英语考点真题库 [单项选择题]What does the woman do 关键词: does woman A.She is a teacher. B.She is a nurse. C.She is a writer (作者,作家). 本题来源:2016年公共英语考试真题卷(4) 查看最佳答案和解析
But in a limited number of cases — usually due to changes that can occur in the lens inside the eye, with or without LASIK surgery — some nearsightedness, farsightedness and/or astigmatism can return over time, causing blurry vision. If a regression of this sort occurs and becomes bothe...
Astigmatism: Light doesn’t focus on the retina correctly because the cornea or lens is misshapen. This can cause both near and far objects to look blurry. Presbyopia: Less flexible lenses and weaker muscles around them cause farsightedness. This happens to everyone as they get older. Glasses ...
They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people’s eyes become cloudy because of cataracts (白内障). Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them. Having two good eyes...