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
A new high-performance contact lens under development at the department for applied physics at the University of Heidelberg will
A new high-performance contact lens under development at the department for applied physics at the University of Heidelberg will
admin
2018-05-11
44
问题
A new high-performance contact lens under development at the department for applied physics at the University of Heidelberg will not only correct ordinary vision defects but will enhance normal night vision as much as five times, making people’s vision sharper than that of cats.
Bille and his team work with an optical instrument called an active mirror—a device used in astronomical telescopes to spot newly emerging stars and far distant galaxies. Connected to a wave-front sensor that tracks and measures the course of a laser beam into the eye and back, the aluminum mirror detects the deficiencies of the cornea, the transparent protective layer covering the lens of the human eye. The highly precise data from the two instruments—which, Bille hopes, will one day be found at the opticians (眼睛商) all over the world—serve as a basis for the production of completely individualized contact lenses that correct and enhance the wearer’s vision.
By day, Bille’s contact lenses will focus rays of light so accurately on the retina (视网膜) that the image of a small leaf or the outline of a far distant tree will be formed with a sharpness that surpasses that of conventional vision aids by almost half a diopter (屈光度). At night, the lenses have an even greater potential. "Because the new lens—in contrast to the already existing ones—also works when it’s dark and the pupil is wide open," says Bille, "lens wearers will be able to identify a face at a distance of 100 meters"—80 meters farther than they would normally be able to see. In his experiments night vision was enhanced by an even greater factor in semi-darkness, test subjects could see up to 15 times better than without the lenses.
Bille’s lenses are expected to reach the market in the year 30, and one tentative plan is to use the Internet to transmit information on patients’ visual defects from the optician to the manufacturer, who will then produce and mail the contact lenses within a couple of days. The physicist expects the lenses to cost about a dollar a pair, about the same as conventional one-day disposable lenses.
What do the two instruments mentioned in the second paragraph refer to?
选项
A、The astronomical telescope and the wave-front sensor.
B、The aluminum mirror and the wave-front sensor.
C、The aluminum mirror and the laser beam.
D、The active mirror and the contact lens.
答案
B
解析
第2段第2句提到“铝镜和波前传感器连接在一起。前者用来测量角膜的缺陷,角膜是在人眼睛晶状体外的起保护作用的一层透明物体;后者是追踪测量激光束往返人眼的过程。由此可知,这两种仪器指的是铝镜和波前传感器,答案为B。
转载请注明原文地址:https://kaotiyun.com/show/60T7777K
0
大学英语六级
相关试题推荐
ALetterofInvitationForthispart,youareallowed30minutestowritealettertoyourforeignlanguageteachertoinvit
A、Aheaterisnotneededatall.B、Devicescanbeusedforfree.C、Itisasbasicaspossible.D、Itcanbefreelymoved.D录音提到移动
A、It’ssettingupjointventures.B、It’sbranchingoutintopolitics.C、Itcomputerizesmanagement.D、Itacceptsinstallmentpay
A、Keepinghertopicfocusedandsupportingheropinionswithfacts.B、Readingextensivelyandcollectingasmuchreferenceaspo
A、Becauseyoungpeoplecan’trememberthevillages.B、BecausethetwoWorldWarsdestroyedmanyvillages.C、Becausethereareno
A、Theydevelopaseriesoflanguagebooksforteaching.B、Theyprovidereadingandwritingpracticestotoddles.C、Theykeepusi
TowardstheendofJune,auniquejointexpeditionbeganinthewatersnearIndonesia.Inanareaofremarkablemarinediversity
Tosaythatthechildlearnsbyimitationandthatthewaytoteachistosetagoodexampleoversimplifies.Nochildimitatese
Tosaythatthechildlearnsbyimitationandthatthewaytoteachistosetagoodexampleoversimplifies.Nochildimitatese
随机试题
行头部MRV扫描时,将饱和带置于扫描区域的下方,其目的是
A.阳气不足B.营血亏损C.阳气暴脱D.中寒腹痛E.虚阳上越
赭石的颜色和表面特征是
有关原发性痛经,错误的说法是
申请投资主办人注册的人员应当具备的条件包括()。Ⅰ.取得证券从业资格Ⅱ.取得证券经纪人资格Ⅲ.具备良好的诚信记录及职业操守Ⅳ.具有3年以上证券投资、研究、投资顾问或类似从业经历
企业所得税前可以扣除税金()万元。该企业2003年应缴纳的企业所得税()万元。
在日常生活中,我们强调一些卫生常识,如饭前便后要洗手,从预防传染病流行的角度来看是为了()
下列选项中,属于学习迁移现象的是
患儿,男性,5岁,家长请教医生幼儿刷牙能否用含氟牙膏,医生的回答是()。
A、wasinspiredbyafriendofMark’swhoworksatNASAB、isthenameofanonlineeducationdiscussionlistC、wasstartedbya
最新回复
(
0
)