复曲硬性透气隐形眼镜的种类和外观设计

,TORICRIGIDGASPERMEABLECONTACTLENSTYPESANDDESIGNS复曲硬性透气隐形眼镜的种类和外观设计Module3.7,CopyrightNoticeTheIACLEContactLensCourse(allformats)isthesolepropertyoftheInternationalAssociationofContactLensEducators(IACLE)andisprotected,withoutlimitations,bycopyright.Byaccessingthismaterial,youagreetothefollowingtermsandconditions:YoumayonlyaccessandusetheIACLEContactLensCourseforpersonaloreducationalpurposes.AnydisseminationorsaleoftheIACLEContactLensCourse,eitherinwholeorinpart,oruseofthematerialsforotherthaneducationalandpersonalpurposes,isstrictlyprohibitedwithouttheexpresswrittenconsentofIACLE.Exceptasdeclaredbelow,youmaynotreproduce,republish,post,transmit,ordistributeanymaterialincludedintheIACLEContactLensCourse.Youmayprintmaterialsforpersonaloreducationalpurposesonly.Allcopyrightinformation,includingtheIACLElogo,mustremainonthematerial.AppropriatereferencemustbeprovidedtoanyuseofthecontentoftheIACLEContactLensCourse,includingtext,images,&/orillustrations.,SPONSORS,DevelopmentanddeliveryofcontactlenseducationbyIACLEissupportedthrougheducationalgrantsandin-kindcontributions,MajorIn-KindSupporters,IndustrySupporters,PublishedinAustraliabyTheInternationalAssociationofContactLensEducatorsFirstEdition1997TheInternationalAssociationofContactLensEducators1996Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmitted,inanyformorbyanymeans,withoutthepriorpermission,inwriting,of:TheInternationalAssociationofContactLensEducatorsIACLESecretariat,POBox656KensingtonNSW1465AustraliaEmail:,CONTRIBUTORS,ToricRigidGasPermeableContactLensTypesandDesigns:Ma.MeredithReyes,OD,MA&RobertTerry,BOptom,MScForacompletelistofacknowledgementspleaseseeourwebsite:,LENSTYPES,FrontsurfacetoricBacksurfacetoricBitoricPeripheraltoric,FITTINGREQUIREMENTS,PhysicallycompatibilityStablemeridionalorientation,FORCESAFFECTINGLENSORIENTATION,LidtorqueGravityTearfilmsurfacetensionLenstocorneafittingrelationshipLidtensionLidposition,FRONTSURFACETORICS,SphericalbacksurfaceBasedownprismCylindricalfrontsurfaceCirculardesignTruncateddesign,SPHERICALBACKSURFACE,Startwith:Opticalzoneabout7.70mmTotaldiameterabout9.20mmTricurve,BASEDOWNPRISMS,MeridionalorientationRequires1-1.75prismdioptresProvidethickness/weightdifferentialNasaloffsetby10-15degrees,RIGHTEYE,UPPERLID,CORNEA,LENS,LOWERLID,PRISMBASEAT280o,BASEDOWNPRISM,ThetendencyforthelenstorotatewithablinkiscounteractedbythethicknessdifferentialofthelensTheheavierprismbasehelpstomaintainmeridionalorientationofthecylindricalcorrection,BASEDOWNPRISM,ThereisacontinuousvariationinthethicknessacrossthelensApexisthethinnestportionandthebasethethickest,CYLINDRICALFRONTSURFACE,Theastigmaticcorrectionisprovidedbyapluscylinderonthelensfrontsurface,CIRCULARDESIGN,OpticalzoneiscentredBasedownprismEasiermanufactureandduplication,TRUNCATEDDESIGN,InferiorpartoflensistruncatedResetsagainstlowerlidforstabilityPrismballastOpticalzoneisdecentredsuperiorly,TRUNCATEDLENS,TRUNCATEDDESIGN,PossiblecontourTaperfromfronttobackFlatbaseTaperfrombacktofront,a,b,c,TRUNCATEDDESIGN,ShapedtomatchlowerlidcontourRemovessomeoftheprismballasteffect(moreinminuspowersthaninplus),TRUNCATION,TRUNCATEDDESIGN,DOUBLETRUNCATION,Asuperiortruncationcanbeaddedtoincreaselensstabilityifasingletruncationisnotsufficient,DOUBLETRUNCATION,UPPERLID,CORNEA,TRUNCATIONS,LOWERLID,LENS,DOUBLETRUNCATION,BACKSURFACETORIC,Thebacksurfacetoricdesignischosentooptimizethelens-to-corneabearingrelationshipthatwouldbeunsatisfactorywithasphericallens,FITTINGREQUIREMENTS,Cornealcylinderof2.00DorgreaterPhysicalcompatibilitywiththecorneaStablemeridionalorientation,LENSDESIGN,BacksurfaceistoricFrontsurfaceisspherical,BACKSURFACETORICLENSDESIGN,FullalignmentmodelLow-toricstimulationmodelOptimaldesignforeachprincipalmeridian,BITORIC,Abitoriclensisrequiredwhenabacksurfacetoric/sphericalfrontsurfacelensresultsinanunacceptableamountofresidualastigmatism,LENSDESIGN,ToricbacksurfaceforphysicalfitToricfrontsurfaceforastigmatismcorrectionRotationalstability,PERIPHERALTORIC,Atoricperipherywithasphericalbackopticzoneisdesignedtoimprovethefitonthecorneaofmoderatetoricity,PERIPHERALTORIC,Atoricperipheralcurve(s)designallowsevenbearingand/orclearanceattheperiphery,resultinginimprovedcentrationandcomfort,LENSDESIGN,SphericalbackopticzoneToricbackperipheralcurvesSphericalfrontopticzoneandperipheralcurvesovalshapedopticzone,10.60,8.60,9.00,11.00,Steepersecondaryandperipheralcurves,Flattersecondaryandperipheralcurves,PERIPHERALTORICFEATURES,ImprovedlenscentrationReducedunevenbearingPreventsperipheralbubbleformation,MANUFACTURING,Mostcommonprocedure:CutandpolishsphericalradiusinablankInsertblankincrimperRecutthelenswithasphericalradiusPolishthelensCheckparameters,MANUFACTURING,Prismcanbegeneratedbyfinishingthebacksurfaceandthencuttingandpolishingthefrontsurfacewithitsaxisatanangletotheplaneoftheposteriorsurface,THANKYOU,TableofContents,CLICKtoretu