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
35
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)
Whom is Mark’s retinal prosthesis ready for?
选项
A、For those who have been blind from birth.
B、For those who still have faint vision.
C、For the blind who once had eyesight.
D、For those who still have one healthy eye.
答案
C
解析
答案的依据在第五段的第一句:The retinal prosthesis and other devices, however show great promise in helping many other sightless people who once had vision see again.
转载请注明原文地址:https://jikaoti.com/ti/9J5YFFFM
0
考博英语
相关试题推荐
Lookatthelistbelow.Itshowsthecontentsofabusinessmagazine.Forquestions6-10,decidewhichsection(A-H)wouldbemost
Lookatthegraphbelow.Itshowstheaveragesharepricesofthreecompanies-GrantInternational,HDCUnionandtheLindelGr
A、The11ammeetingispostponedbecausePeter’strainwascancelled.B、Peterwillarriveatthe11ammeetinglatebecausehis
Readthenewspaperarticlebelowaboutapartnershipbetweenindustryandschools.Aresentences16-22belowthearticle"Ri
Questions16-22-Readthearticlebelowaboutinventorycontrolmanagementinanorganisation.-Aresentences16-22’Right’o
ItispossibleforstudentstoobtainadvanceddegreesinEnglishwhileknowinglittleornothingabouttraditionalscholarlyme
Thevegetativeformsofmostbacteriaarekilledbydryinginair,althoughthedifferentspeciesexhibitpronounceddifferences
Changesinthevolumeofunemploymentaregovernedbythreefundamentalforces:thegrowthofthelaborforce,theincreaseino
Thecompanywill______toitsagreement,nomatterhowcostlytheprocessmaybe.
Heneverfailedto______hisaccomplishmentsbypointingtohisbrother’seminence.
随机试题
2001年12月,美国克莱顿公司向我国某海事法院起诉,根据其对我国巴林顿公司货轮“明星号”享有的货款抵押权求偿。经法院调查,“明星号”是我国巴林顿公司从英国租用的一艘在利比亚登记并挂利比亚国旗的光船。我国该海事法院在处理该案时,应适用下列哪一法律?( )
某工程预计工期10个月,施工合同价款为600万元人民币。根据《建筑工程施工许可管理办法》的规定,建设单位在申请领取施工许可证时,应当到位的资金原则上不得少于()万元人民币。
根据《建设工程质量管理条例》,下列选项中,( )符合勘察、设计单位质量责任和义务的规定。
下列公式中错误的是()
甲公司为乙公司的母公司,2014年3月31日发生如下业务,甲公司以500万元的价格将其生产的产品销售给乙公司,其销售成本为350万元。乙公司购买该产品作为管理用固定资产使用。乙公司对该固定资产按3年的使用期限采用年限平均法计提折旧,预计净残值为0。乙公司在
方针目标管理通过PDCA循环,以()相结合的经济责任制为考核手段,确保方针目标管理全过程的实现。
甲、乙两地点之间有三条道路相连。某地理活动小组测绘了这三条道路的纵向剖面图(图3)。在对应的地形图上可以看出()。
悉尼歌剧院的设计者是()人。
简述民事法律关系。[中山大学2016年研]
并行数据库系统中,对关系进行划分并把它们分布到多个磁盘,所采用的主要技术有3种:轮转法、散列分布和【】。
最新回复
(
0
)