Farsightedness, also referred to as “hyperopia” by eye doctors, is the common term describing eyesight that is blurry on objects that are nearby, but clear when you look at anything in the distance. So, watching TV may be a problem, but reading a highway billboard probably isn’t. ...
What is farsightedness? Medically referred to as hyperopia, farsightedness occurs when light is focused behind the retina instead of directly on it. Farsightedness is caused by a flat cornea, or if the eyeball is too short. Different from being nearsighted, a far-sighted person will be ab...
The exact causes of farsightedness are unknown, but it seems to be hereditary. If your parents have hyperopia, there’s a greater chance that you will too. About 5%-10% of Americans are farsighted. Farsightedness can be due to an eyeball that is too short in length from front to bac...
ButBlattnerassuresthattakingnapscanalsobebeneficial.“Nappingisnotalwaysacausefor concern.Takinganapcanberefreshingandenjoyable,”shesays.“Thekeyis,areyoumissing outonthingsthatyouenjoybecauseyouaretoosleepytostayawake—thatcanindicatea problem—ordoesthenaphelpyougetmoreoutofyourday?” “Takingabriefnapcan...
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 Farsightedness? 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 ne...
Myopia (nearsightedness) is a highly common eye condition that is predominantly caused by an axial elongation of the eye. Myopia can usually be corrected with negative glasses, contact lenses, and/or laser refractive surgery. Unfortunate... V Verhoeven 被引量: 0发表: 2015年 What causes myopia...
SEE RELATED:Is your child at risk for myopia? Early detection Detection of myopia in early childhood is very important. Some children who develop myopia at a young age can go on to developprogressive myopia, which can reach severe nearsightedness, calledhigh myopia. ...
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...
Kolata, Gina