contact lenses howmed lectures medical lectures and 隐形眼镜的howmed医学讲座，讲座.ppt

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1、CONTACTLENSESCONTACTLENSESCONTACTLENSESOpticaldevicesplaceddirectlyinfrontandadjacenttocorneaTorectifyrefractiveerrorsToprovideprotectionToimprovecosmeticsCLASSIFICATIONOFCONTACTLENSESAnatomicalpositionScleralcontactlensesSemi-scleralcontactlensesCornealcontactlensesNatureofmaterialRig

2、idnon-gaspermeablecontactlenses(PMMA)Rigidgaspermeablecontactlenses(CAB)Softcontactlenses(HEMA)ModeofwearDailywearcontactlenses(hardcontactlenses)Extendedwearcontactlenses(softcontactlenses)DisposablecontactlensesCLASSIFICATIONOFCONTACTLENSESFDAcontactlensclassificationGroup1–Lowwaterc

3、ontent(<50%),nonionicpolymersGroup2-highwatercontent(>50%),nonionicpolymersGroup3-lowwatercontent(<50%),ionicpolymersGroup4-highwatercontent(>50%),ionicpolymersRefractivecorrectionSphericalcontactlensesToriccontactlensesBifocalcontactlenses(annular,segmental,diffractive,aspheric)ColorG

4、reenBrownBlueUvblockingWithorwithoutUVblockerINDICATIONSOFCONTACTLENSESOpticalindicationsAnisometropiaUnilateralaphakiaHighmyopiaAstigmatismKeratoconusContdTherapeuticindications(BCLs)CornealdiseasesNonhealingcornealulcerRecurrentcornealerosionsyndrome(cornealdystrophy)Bullouskeratopat

5、hyFilamentarykeratitisIrisdiseasesAniridia,coloboma,albinismOtherconditionsPostsurgery(cornealtransplant,LASIK,PRK)Bell’spalsyBlebleakposttrabeculectomyLidabnormalities(Entropion,lidlag,trichiasis)INDICATIONSOFCONTACTLENSESPreventiveindicationsSymblepharon,restorationoffornicesinchemic

6、alburnsExposurekeratitisCosmeticindicationsCornealscarsCosmeticsclerallensesinpthisisbulbiTochangecolorOccupationalindicationsSportsmenPilotsMiscellaneousPtosis–hapticcontactlensifnoBell’sphenomenonOccluders–amblyopiainchildrenVehiclefordrugdelivery–soakingasoftcontactlensProtectionofn

7、ormalcornealepitheliumintrichiasisorthreatenedexposurekeratopathyINDICATIONS(CONTD)AdvantagesoverspectaclesVisualfieldsOpticalaberrationAccommodationandconvergencePrismsTintCLINICALLYIMPORTANTFEATURESFieldofvisionlargerfieldavoidperipheraldistortionImagesizeCLINICALLYIMPORTANTFEATURE