Nearsightedness is the most common distancerefractive erroramong children and young adults. It occurs in 30% to 40% of adults in the U.S. and Europe and in up to 80% to 90% of theAsianyoung adult population. The medical term for nearsightedness ismyopia. The prevalence of myopia has ...
longsighted 英[lɒŋˌsaɪtɪd]美[[lɒŋˌsaɪtɪd] adj.远视的,目光长远的 farsighted 英['fɑ:'saɪtɪd] 在后面加上 - ness 就变成名词形式。 farsightedness 英['fa:saɪtɪdnɪs]...
The number of nearsighted people has risen rapidly in recent years, and researchers have predicted that half the world will be myopic by 2050. One study by the College of Optometrists found that myopia is more than twice as common among kids in the U.K. now than it was the 1960s. ...
The co-author model by Jackson/Wolinsky (1996) is used as an example. The co-author model formulates a tension between stability and efficiency when actors are myopic. Limitedly farsighted actors can overcome this tension but only if the network is small enough. Thus, changing the micro-...
、“The number of nearsighted people has risen quickly in recent years, and researchers have predicted that half the world will be myopic by 2050.”以及“One study by the College of Optometrists found that myopia is more than twice as common among kids in the U.K. now than it was the ...
Farsightedness, or hyperopia, is a common refractive error. It happens when the eye is shorter than normal. The lens of the eye focuses an image on the back of the eye, called the retina. The retina is covered with photoreceptor cells. It converts light into neural signals to be sent...
Nearsightedness and farsightedness occur when the focusing is not perfect. When nearsightedness (myopia) is present, a person is able to see near objects well and has difficulty seeing objects that are far away. Light rays become focused in front of the retina. This is caused by an eyebal...
This gives a hawk vision that is eight times more acute than a human's. A hawk might have 20/2 vision! Errors of Refraction Normally, your eye can focus an image exactly on the retina: Nearsightedness and farsightedness occur when the focusing is not perfect. When nearsightedness (...
Nowadays, there are more and more students becoming short-sighted. Some students get short-sightedness when they are little. There are fifteen students wearing glasses in my class. Being short-sighted is common among students, even in primary school. ...
The most common cause of blurry vision is a one or a combination of the four main refractive errors: nearsightedness, farsightedness, astigmatism andpresbyopia. All four vision conditions can be treated with corrective eyewear that can be prescribed easily after an eye exam with your local eye...