Other names forshortsightednessare: myopia and nearsightedness. In many parts of the world, the wordsmyopia, nearsightednessandshortsightednessare used interchangeably. Myopia is the medical term for the condition, and the other two are commonly used names. If you're into etymology (the study ...
What type of lens is used to correct nearsightedness? A. Convex lens B. Concave lens C. Plane mirror D. Prism 相关知识点: 试题来源: 解析 B。解析:近视是由于眼睛的晶状体对光线的会聚能力太强,需要用凹透镜来矫正。选项 A 凸透镜用于矫正远视眼;选项 C 平面镜主要用于反射;选项 D 棱镜用于光...
What is the main idea of the passage? A. Children's short-sightedness can be cured. B. There are several causes of childre n's short-sightedness. C. Spending more time outdoors can lead to better eyesight. D. Children who spend more time outdoors are much healthier. ...
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a4、It can be argued that memory and foresightedness are the essence of intelligence; that man’s ability to manipulate time, to employ both past and future as guides to presentation, is what makes him human. 4、它可以被争论记忆和深谋远虑是智力精华; 人的能力操作时刻,过去使用两和未来作为对...
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What can be learnt from the passage? A. Nearsightedness may cause other health problems. B. There are more nearsighted students in the United States. C. 70 percent of Chinese students in primary school are nearsighted. D. Pathological myopia is most likely to cause blindness. ...
Long the subject of debate on the "genes versus environment" theme, an animal model shows that at least some myopia may be acquired. G Kolata 被引量: 0发表: 1985年 What causes myopia? Myopia (nearsightedness) is a highly common eye condition that is predominantly caused by an axial ...
Spherical contact lenses correct blurry, farsighted eyesight. Be sure to consider all of your options, like how often you’d like to change your contacts or how long you’ll be wearing them in one day. Prescription glasses Eyeglasses are another option for correcting farsightedness. It’s a...
Farsightedness is the result of an eyeball that is too short or a cornea with too little curve, and light projects behind the retina instead of on it. Myopia vs. astigmatism –Astigmatism is another type of blurry vision caused by an irregular eye structure. In the case of astigmatism, ...