首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Famed singer Stevie Wonder can’t see his fans dancing at his concerts. He can’t see the hands of his audience as they applaud wi
Famed singer Stevie Wonder can’t see his fans dancing at his concerts. He can’t see the hands of his audience as they applaud wi
admin
2011-05-29
81
问题
Famed singer Stevie Wonder can’t see his fans dancing at his concerts. He can’t see the hands of his audience as they applaud wildly at the end of his Superstition.
Blind from birth, Wonder has waited his whole life for a chance to see. Recently, Wonder visited Mark Hamayan, a vision specialist. He thought that a new device currently being studied by Humayan might offer him that chance.
The device, a retinal prosthesis, is a tiny computer chip implanted inside a patient’s eye. The chip sends images to the brain and allows some sightless people to see shapes and colors. Wonder hoped the retinal prosthesis might work for him. "I’ve always said that if ever there’s possibility of my seeing," said Wonder, "then I would take the challenge."
Unfortunately for Wonder, that challenge will have to wait. Humayan explained that the device isn’t ready for people who have been blind since birth. Their brains may not be able to handle signals from a retinal prosthesis because their brains have never handled signals from a healthy eye.
The retinal prosthesis and other devices, however, show great promise in helping many other sightless people who once had vision see again. Perhaps one day soon, some formerly sightless people may be in Wonder’s audience looking up—and seeing him—for the very first time.
Wonder’s willingness to take part in retinal prosthesis studies and the results of those studies are giving new hope to people who thought they would be blind for the rest of their lives. More than one million people in the United States are considered legally blind, meaning that their eyesight is severely impaired. Another one million are totally blind.
Two types of specialized cells in the retina—rods and cones—are critical for proper vision. Light enters the eye and falls on the rods and cones in the retina. Those cells convert the light to electrical signals which travel through the optic nerve to the brain. The brain interprets those signals as visual images. Rods detect light at low levels of illumination. For instance, rods allow you to see faint shadows in dim moonlight. Cones, on the other hand, are most sensitive to color. Some diseases can damage cells in the retina. For instance, macular degeneration causes blindness and other vision problems in 700,000 people in the United States each year. The condition is caused by a lack of adequate blood supply to the central part of the retina. Without blood, the rods, cones, and other cells in the retina die.
Devices such as the retinal prostheses won’t prevent or cure our eye diseases, but they may help patients who have eye disorders regain some of their vision. Different forms of retinal prostheses are currently being developed. On one type, a tiny computer chip is embedded in the eye. The chip has a grid of about 2,500 light-sensing elements called pixels.
Light entering the eye strikes the pixels, which convert the light into electrical signals. The pixels then send the electrical signals to nerve cells behind the retina. Those cells send signals via the optic nerve to the brain for interpretation.
Many people who have had a retinal prosthesis implanted say they can see shapes, colors, and movements that they couldn’t see before. "It was great," said Harold Churchey, who received his retinal prosthesis 15 years after he became totally blind. "To see light after so long—it was just wonderful. It was just like switching a light on."
(572 words. Current Science. April 7, 2000)
Why does macular degeneration cause blindness and other vision problems?
选项
A、Macular degeneration causes improper interpretation by the brain.
B、Macular degeneration makes the retina less sensitive to the light.
C、Macular degeneration changes the functions of rods and cones.
D、Macular degeneration is the result of inadequate supply of blood in the retina.
答案
D
解析
答案的依据在第七段的最后两句:The condition is caused by a lack of adequate blood supply to the central part of the retina. Without blood, the rods, cones, and other cells in the retina die.
转载请注明原文地址:https://kaotiyun.com/show/cL6O777K
0
考博英语
相关试题推荐
ReadtheinformationaboutThomasEdison.Choosethecorrectwordtofilleachgap,fromA,BorC.Foreachquestion29-
Lookatthelistbelow.Forquestions6-10,decidewhichkindofservice(A-H)eachpersonontheoppositepageneeds.Foreachqu
Areyoualwayssureyouknowwhatpeoplemeanwhentheytrytodescribetheirfeelingstoyou?Weusebothwordsandgesturesto
ItisnotoftenrealizedthatwomenheldahighplaceinsouthernEuropeansocietiesinthe10thand11thcenturies.Asawife,
Itwasallagreedthatthefirstproblemthenewgovernmentwouldhaveto______wasunemployment.
WhenIwasakid,Ineverknewwhatmyparents—oranyoneelse’s—didforaliving.AsfarasIcouldtell,allgrownupshadm
MostcriticalplotpointsinHarryPotterandtheSorcerer’sStonecamefromJ.K.Rowling’simagination,butFlamelandhispowe
Ofalltheareasoflearningthemostimportantisthedevelopmentofattitudes.Emotionalreactionsaswellaslogicalthought
(86)Eachday,50,000shiny,fire-engine-redGalaapplesworkthewaythroughasprawlingfactoryinSwedesboro,N.J.(87)Ins
Hequickly______behindthebuildingtoavoidbeinghurtbythestonesthrowninhisdirection.
随机试题
肾交感神经节后纤维释放的去甲肾上腺素可调节
代谢性碱中毒的代偿中,哪项是恰当的
腺体鳞状上皮化生后发生恶性变,所形成的恶性瘤称为
最适于地面消毒皮肤
上市公司及其控股股东或实际控制人最近36个月内存在未履行向投资者作出的公开承诺的行为,不得公开发行证券。()
定势是一种消极的心理活动准备状态。()
外交家考虑问题显然不如法学家那么___________,也不如经济学家那样“___________”,能否就某一议题达成共识完全取决于国内政治力量的妥协和谈判桌上的临场发挥。至于最后谈判文本对本国福利的影响以及如何从法律上得以保证文本的执行,外交家们保留了
简述新闻本源和来源的区别。(中南财经政法大学,2008年)
Ibecameinterestedinwritingatanearlyage.Sowhenmyfourth-gradeteachertoldmeabouta【C1】________writer’sconference
Jason:Hi,Jane.Doyouhaveanychange?Ihavetomakeacallonthepayphone.Jane:______
最新回复
(
0
)