医学教学课件：散光硬镜验配.ppt

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1、RGPlensforAstigmatism.SchoolofOptometry&Ophthalmology,WenzhouMedicalCollege1RGPlensforAstig.SphericalRGPFirstconsideration<3.00DMostlyworksToricRGPAfew2SphericalRGPlensFittingprinciple:refertolast“Chapter”TearLens34567ToricRGPLensesStabilizedfittingImprovedlenstocorneafit

2、tingrelationshipBettercornealphysiologythansofttoriclens8FitToricRGPLensesRGPLensesshouldmoveupanddownduringtheblink42.0046.0042.0046.0046.0042.0046.00RGPLensesshouldnotmovefromsidetoside9SphericalRGPLensesAsphericalRGPlensonamoderatelyastigmaticcorneaisaperfectfit10Toric

3、RGPLensesWhentherearesignificantareasofbearingandlift,aspecialRGPlenscanbecreated11FluoresceinPatternsHighlyastigmaticcorneatooloosevertically--toomuchlift1245.0042.0013SamecorneawithasteeperbasecurveBetteralignmentintheverticalButtoomuchtouchinthehorizontal14FluoresceinP

4、atternsAstigmaticcorneathatistootighthorizontally15DoubletheCurves…DoubletheFunTofitacorneawithmoderatetohighamountsofcornealastigmatism,alenscanbedesignedwithtwoseparatecurvesonthebacksurface.Inside/backsurface44.0042.001617DoubletheCurves…DoubletheFunBecausealensshouldn

5、otmovefromsidetoside…...thehorizontalmeridianshouldbefitonhorizontal“K”orslightlysteeperthanhorizontal“K”18DoubletheCurves…DoubletheFunBecausealensshouldfreelymoveupanddowntheverticalmeridianshouldbefitslightlyflatterthanvertical“K”19FrontSurfaceToricLensesWhenthecorneaha

6、slessthan2.00Dofcornealastigmatismandthereisadiscrepancyintheamountofrefractiveastigmatism“K”42.00@180/42.50@90Rx-2.50-2.50x18020SphericalRigidContactLensesCanOnlyImpacttheAstigmatismFoundontheSurfaceoftheCornea2122232425FrontSurfaceToricLenses“K”42.00@180/42.50@90Rx-2.

7、50-2.50x180ROL-0.25-2.00x178Lens42.00D-2.50D9.4mm26FrontSurfaceToricLensesFinal42.00-2.75-2.00x1789.4ROL-0.25-2.00x178Lens42.00-2.509.4PrismBallasted272829DoubletheCurves…DoubletheFunParameterChoiceExerciseRx:-3.00D/-4.50Dx180K:42.00D/46.50D@903042.00DPlacethehorizontal“K

8、”valueonthehorizontalaxis:42.00@1803146.50DPlacethevertical“K”valueontheverticalaxis:46.50@9032