题目内容：
Questionsarebasedonthefollowingpassage. Anewhigh-performancecontactlensunderdevelopmentatthedepartmentforappliedphysicsattheUniversityofHeidelbergwillnotonlycorrectordinaryvisiondefectsbutwillenhancenormalnightvisionasmuchasfivetimes,makingpeople’svisionsharperthanthatofcats.
Billeandhisteamworkwithanopticalinstrumentcalledanactivemirror—adeviceusedinastronomicaltelescopestospotnewlyemergingstarsandfardistantgalaxies.Connectedtoawave-frontsensorthattracksandmeasuresthecourseofalaserbeamintotheeyeandback,thealuminummirrordetectsthedeficienciesofthecornea,thetransparentprotectivelayercoveringthelensofthehumaneye.Thehighlyprecisedatafromthetwoinstruments—which,Billehopes,willonedaybefoundattheopticians（眼镜商）allovertheworld—serveasabasisfortheproductionofcompletelyindividualizedcontactlensesthatcorrectandenhancethewearer’svision.
Byday,Bille’scontactlenseswillfocusraysoflightsoaccuratelyontheretina（视网膜）thattheimageofasmallleafortheoutlineofafardistanttreewillbeformedwithasharpnessthatsurpassesthatofconventionalvisionaidsbyalmosthalfadiopter（屈光度）.Atnight,thelenseshaveanevengreaterpotential.“Becausethenewlens—incontrasttothealreadyexistingones—alsoworkswhenit’sdarkandthepupiliswideopen,”saysBille,“lenswearerswillbeabletoidentifyafaceatadistanceof100meters”—80metersfartherthantheywouldnormallybeabletosee.Inhisexperimentsnightvisionwasenhancedbyaneve
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