视光学理论与方法：屈光与屈光不正.pdf

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1、2015/9/21Eyerefraction&AmetropiaJingjingXuSchoolofOptometry&Ophthalmology2015-09-21Eye:compoundopticalsystem12015/9/21CameraVSeyeballBasicconditionsforclearvisionClearrefractingmediaAnclearandnot-too-smallimageofthesubjectisrightonthefoveaofretinalntactandno

2、rmalvisualpathway,includingretina,opticnerve,optictract,opticradiationandcerebralcortex22015/9/21InterestingSinceallthingsforminvertedimagesontheretina,whydoweseeanerectedworldStrattontest-theinvertedimageistrue,aswellastheerectedworldHowtounitethetworeverse

3、dfacts—withpsychologyofvision,namelyexperienceOpticalcomponentsoftheeye•Cornea•AqueoushumorCrystallinelens•gradientindexVitreoushumor•Retina\32015/9/21CorneaEllipse:V

4、orsurface:6.8mmRefractiveindex:1.376Refractivepower??AnteriorchamberAqueousrefractingmediamaintainIOPandnormalshapeoftheeyeballDepthofAC1mm≈1.4D42015/9/21CrystallinelensBiconvexlensOneofrefractivecomponentsImportantfunction:accommodationAccommodation5

5、2015/9/21AccommodationFarpointandnearpointAmplitudeofacc.AgeandAcc.AccommodationLinkageofnearvisionAccommodationVergenceSmallinPupilsize62015/9/21OpticalmodeloftheeyePositionoftherefractivecomponentsAxiallengthoftheeyeRadiusofcurvatureAsphericityRefractiv

6、eindexSchematicandreducedeyemodelsSchematiceyesGullstrandSchematicEyeNo.1orGullstrandexactschematiceyeGullstrand-EmsleySchematicEyeorGullstrandschematiceyeNo.2wideangleopticalmodaloftheeyeEmsley’sreducedeye72015/9/21SchematicandreducedeyemodelsSchematiceyes:Gul

7、lstrandSchematicEyeNo.1orGullstrandexactschematiceyeGullstrand-EmsleySchematicEyeorGullstrandschematiceyeNo.2wideangleopticalmodaloftheeyeEmsley’sreducedeyeGullstrandSchematicEyeNo.16refractingsurfacescornea:2lens:4Axiallength:24mm82015/9/21GullstrandSchematicE

8、yeNo.1corneaH’Hn=1.336nc=1.376t=0.5mmr1anteriorcurvature=7.7mm;r2posteriorcurvature=6.8mmF1=48.83DF2=–5.88DFe=43.05Df1=–23.227mmf2=31.031mmGullstrandSchematicEyeNo.1crystall