巩膜搜索线圈对微扫视性眼球运动幅度影响的观察与分析

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1、万方数据天津医科大学硕士学位论文AbstractObjectiveThisstudywastoobserveandanalyzewhetherwearingascleralsearchcoilhasanimpactonthemagnitudeofmicrosaccades．Methods1．Thefirststepwastomeasurethesystemprecisionofthevideoeyetrackerandevaluatetheeffectoftherelatedfactorsontheresult．TheEyeLink2000hi曲speedvideoeyetrackera

2、ndapairofartificialeyeswereusedinthisstudy．Firstlytheartificialeyeswerefirmlyfixedtothecorrespondingpositionastherealhumaneyes，andthenrelatedparametersweresetbeforerecording．Eachsessionofrecordingwasundertakenunderdifferentcombinedconditionsofinfraredillumination(100％，75％and50％)andindoorilluminat

3、ion(1lux，301ux，3001uxand22001ux)．Thesamplingfrequencyofbinocularrecordingis1000Hz．Eachsessionofrecordinglastedfor60seconds．Thesystemprecisionwascalculatedastherootmeansquare(RMS)ofangulardistancesbetweensuccessivedatapoints．SPSS17．0statisticalsoftwarewasusedtoperformtheone．wayANOVAtoanalysethedif

4、ferenceamongsystemprecisionsunderthesameinfraredilluminationorthatunderthesameindoorillumination．TheS—N．Ktestwaschosentoperformtheposthocmultiplecomparisons．2．Weusedcustomizedscleralsearchcoilsastheexperimentalmaterial．Themicrosaccadeeyemovementsofthehealthyvolunteerswithoutametropiaunderdifferen

5、tconditionswiththeoptimalsystemprecisionofthevideoeyetrackerwererecorded．Thevolunteers’eyesweretopicallyanesthetizedbeforewearingthescleralsearchcoils．Thevolunteersfixatedatthetargetonthescreeninfrontofthem，andtherecordinglastedforlmin．WeusedaMatlabprogramtodetectandanalyzethemicrosaccadeevents，T

6、heSPSS17．0statisticalsoftwarewasadoptedtoperformthepaired—samplesttesttoanalyzethedifferenceofthetwoeyesineachgroup．Results1．Thehighestsystemprecisioncameouttobe0．00501。±O．00020。underthe万方数据天津医科大学硕士学位论文100％infraredilluminationand1luxindoorillumination．Undertheindoorilluminationof1lux，301ux，3001ux

7、and22001uxrespectively,thesystemprecisionsshowedstatisticallysignificantdifferencewhentheinfraredilluminationchanged(F11．x=3791．447，P<0．01；F301。x=3716．024，P<0．01；F3001,,x=3120．527，P<0．0l；F2200lux=3325．239，P<0．01)．Thedi