CONTACTLENSES-howMedLectures-MedicalLecturesand隐形眼镜的howmed医学讲座，讲座

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1、CONTACTLENSESCONTACTLENSESCONTACTLENSESOpticaldevicesplaceddirectlyinfrontandadjacenttocorneaTorectifyrefractiveerrorsToprovideprotectionToimprovecosmeticsCLASSIFICATIONOFCONTACTLENSESAnatomicalpositionScleralcontactlensesSemi-scleralcontactlensesCornealcontactlenses

2、NatureofmaterialRigidnon-gaspermeablecontactlenses(PMMA)Rigidgaspermeablecontactlenses(CAB)Softcontactlenses(HEMA)ModeofwearDailywearcontactlenses(hardcontactlenses)Extendedwearcontactlenses(softcontactlenses)DisposablecontactlensesCLASSIFICATIONOFCONTACTLENSESFDAcon

3、tactlensclassificationGroup1–Lowwatercontent(<50%),nonionicpolymersGroup2-highwatercontent(>50%),nonionicpolymersGroup3-lowwatercontent(<50%),ionicpolymersGroup4-highwatercontent(>50%),ionicpolymersRefractivecorrectionSphericalcontactlensesToriccontactlensesBifocalco

4、ntactlenses(annular,segmental,diffractive,aspheric)ColorGreenBrownBlueUvblockingWithorwithoutUVblockerINDICATIONSOFCONTACTLENSESOpticalindicationsAnisometropiaUnilateralaphakiaHighmyopiaAstigmatismKeratoconusContdTherapeuticindications(BCLs)CornealdiseasesNonhealingc

5、ornealulcerRecurrentcornealerosionsyndrome(cornealdystrophy)BullouskeratopathyFilamentarykeratitisIrisdiseasesAniridia,coloboma,albinismOtherconditionsPostsurgery(cornealtransplant,LASIK,PRK)Bell’spalsyBlebleakposttrabeculectomyLidabnormalities(Entropion,lidlag,trich

6、iasis)INDICATIONSOFCONTACTLENSESPreventiveindicationsSymblepharon,restorationoffornicesinchemicalburnsExposurekeratitisCosmeticindicationsCornealscarsCosmeticsclerallensesinpthisisbulbiTochangecolorOccupationalindicationsSportsmenPilotsMiscellaneousPtosis–hapticconta

7、ctlensifnoBell’sphenomenonOccluders–amblyopiainchildrenVehiclefordrugdelivery–soakingasoftcontactlensProtectionofnormalcornealepitheliumintrichiasisorthreatenedexposurekeratopathyINDICATIONS(CONTD)AdvantagesoverspectaclesVisualfieldsOpticalaberrationAccommodationandc

8、onvergencePrismsTintCLINICALLYIMPORTANTFEATURESFieldofvisionlargerfieldavoidperipheraldistortionImagesizeCLINICALLYIMPORTANTFEATURE