对比敏感度值

CONTRASTSENSITIVITYCSV-1000NORMSCONTRASTVALUESFORTHECSV-1000E:ThefollowingtablesshowthecontrastsensitivityscoresfortheCSV-1OOOEforbothlinearandlogvalues.Forstatisticalanalysis,useofthelogvaluesisrecommended.ContrastSensitivityValuesfortheCSV-1OOOE:S12345678Row(CPD)A(3.0)(0.1)510152231436185120B(6.0)(0.2)8162436507099138193C(12.0)(0.4)4812182535507099D(18.0)(0.6)1.534.579.513182536ContrastSensitivityValuesfortheCSV-1OOOEinLogUnits:S12345678Row(CPD)A(3.0).7011.171.341.491.631.781.932.08B(6.0).911.211.381.551.701.841.992.142.29C(12.0).61.911.081.251.401.541.691.841.99D(18.0).17.47.64.81.961.101.251.41.55Nozerovalueexistsonalogarithmicscale.Forresearchpurposes,donotenterazeroinyourdataifthepatientcannotseethefirstgrating(samplegrating).Toobtainalogvalueifnogratingsarevisible,subtract.3logfromthelowestscoreontherow(i.e.RowA.4,RowB.61,RowC.31andRowD-.13).PopulationNorms(ChildrenAgeGroup:6-10and11-19YearsofAge):Thetablebelowprovidespopulationnormalvaluesforchildrenbetweentheagesof6to10yearsoldand11to19yearsold.ThisdatawascollectedaspartofalargerstudyinwhichProfJ.KrasnyandcolleaguesfromtheDepartmentofOphthalmology,UniversityHospitalintheCzechRepublicstudiedtheusefulnessoftheCSV-1000todetectearlyocularchangesinchildren.*Ages6to10SpatialFrequencyAverageStandardDeviationRowA(3cpd)1.82(Contrastlevel6).13RowB(6cpd)2.04(Contrastlevel6).14RowC(12cpd)1.74(Contrastlevel6).11RowD(18cpd)1.29(Contrastlevel6).11Ages11to19SpatialFrequencyAverageStandardDeviationRowA(3cpd)1.92(Contrastlevel6).09RowB(6cpd)2.19(Contrastlevel7).12RowC(12cpd)1.89(Contrastlevel7).10RowD(18cpd)1.42(Contrastlevel7).12*Čes.aslov.Oftal.,62,2006,No.6,p.372-380.PopulationNorms(YoungerAgeGroup:20-55YearsofAge):Thefollowingtablesshowdatacollectedasbaseline(preoperative)measurementsinanFDAclinicaltrialforrefractivesurgery.Theseresultsarebasedontheevaluationof156normaleyes(79patients)withanagerangeof21-55yearsofage(36.6yo+9.02years).Averagepreoperativeacuityforthesepatientswas20/16+2.35(numberofletters:45.07+3.08).PhotopicConditionsSpatialFrequencyLogAverage(ContrastLevel)StandardDeviationRowA(3cpd)1.84(6.38).14(0.93)RowB(6cpd)2.09(6.67).16(1.08)RowC(12cpd)1.76(6.46).17(1.15)RowD(18cpd)1.33(6.50).19(1.31)MesopicConditionsSpatialFrequencyLogAverage(ContrastLevel)StandardDeviationRowA(3cpd)1.61(4.85).21(1.43)RowB(6cpd)1.66(3.77).23(1.50)RowC(12cpd)1.08(2.33).32(1.56)RowD(18cpd)0.56(1.97).35(1.52)PopulationNorms*(OlderAgeGroup:50-75YearsofAge):SpatialFrequencyAverageStandardDeviationRowA(3cpd)1.56(Contrastlevel4).15RowB(6cpd)1.80(Contrastlevel5).165RowC(12cpd)1.50(Contrastlevel5).15RowD(18cpd).93(Contrastlevel4).25*PomeranceG,EvansD.Test-RetestReliabilityoftheCSV-1000ContrastTestandItsRelationshiptoGlaucomaTherapy.InvestOphthalmolVisSci.1994.35(9);3357-3361.Testfor1.5cycles/degreeforevaluationofmesopiccontrastsensitivityorlowvisionTheCSV-1000-1.5cpdisaspecialtestfacedesignedforFDAclinicaltrialsandforlowvisionassessment.Thefollowingprovidestheanswerkeyforthistestfaceandthecontrastvaluesinlogunits.AnswerKeyS12345678BAABBBABContrastSensitivityValuesfortheCSV-1000-1.5cpdinLogUnitsS12345678.60.901.071.221.371.521.671.821.97TheCSV-1000-1.5cpdhasbeenadoptedfortheFDAclinicaltrialstoevaluatemesopiccontrastsensitivitytestingandmesopicglaresensitivitytestingforrefractivesurgeryandcertainintraocularlenses(IOLs).IfthereareanyquestionsconcerningtheuseoftheCSV-1000instrumentformesopiccontrastorglaretesting,pleasecontactus.PlottingaContrastSensitivityCurve:Mostcommerciallyavailablecontrastsensitivitytestsprovidemeasuresfor4or5sizebarpatterns(spatialfrequencies).Eachofthesespatialfrequenciesispresentedat8to10contrastlevels.Toplotthecurve,simplydeterminethehighestcontrastsensitivitylevelapatientcandetectforeachspatialfrequency.ThecurveontherightshowsanexamplefortheCSV-1000contrastsensitivitytest.OnrowAoftheCSV-1000,thehighestcontrastsensitivitylevelthepatientcandetectislevel5.OnrowB,thehighestlevelis7.OnrowCandDthehighestlevelsare6and5,respectively.Toplotthecurve,checkthenumber5incolumnA,7incolumnB,6incolumnCand5incolumnD.Connectthesecheckmarksandtheresultisacontrastsensitivitycurve.Visitotherpartsofourwebsitetodeterminehowthiscurvecanbeusedtoassesscataracts,glaucoma,diabetes,refractivesurgery,contactlenses,etc.Contrastsensitivitydeterminesthelowestcontrastlevelwhichcanbedetectedbyapatientforagivensizetarget.Normallyarangeoftargetsizesareused.Inthiswaycontrastsensitivityisunlikeacuity.Contrastsensitivitymeasurestwovariables,sizeandcontrast,whileacuitymeasuresonlysize.