硬性角膜接触镜.ppt

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2024-11-11 发布于广东
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硬性角膜接触镜.ppt

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**Whilesoftlensesalsocanbeevaluatedwiththeaidofmovementandpositioningclues,therealmessagecomesthroughtheloudestwiththeaidoffluorescein.Thistoolenablesthecontactlensprofessionaltodeterminewhetherthelensisproperlyfitforthepatientand,moreimportantly,enablesthemtodeterminehowtoimproveafitthatneedsimprovement.WORKBOOK#11**ThesephotosgoevenonestepfurtherandusetheyellowWrattenfilterinfrontoftheeyepieceontheslitlamp.Nowitiseveneasiertodeterminethedifferentareasoftearvolume.Pointouttotheattendeestheareasinwhichtherearealotoftearsandareaswheretearsarelessabundant.Describetothemtheneedfordifferentvolumesoftearsbeneaththelens:thecentershouldbealigned,themid-peripheryshouldbeclosertoaidinpositioningofthelensandtheedgeshouldbebrightersinceitisatearreservoir.Lettheattendeesknowthatthisisunderstoodbythemanufacturerswhohavedesignedthelensestomeettheseneeds.***THERESHOULDBEAWRATTENFILTERFOREVERYATTENDEEINTHEIRWORKBOOKSWORKBOOK#11**Now,thisprincipleofRGPdesignfitsinperfectlywiththegeneralschemeofthings.Statethisasarule,amantra,aprincipleofmovableobjects:anRGPlenswillmoveintheareathatitencountersitsleastresistance.WORKBOOK#8**Thefirstevaluationcanbedonewithouttheaidoffluoresceinandinvolveshowthelensmovesontheeye.Ifthelensmovestoomuch,thepatientwillcertainlynoticeit.Ifthelensmovestoolittle,thecorneawillcertainlynoticeit.Thegoalistoallowthelenstohaveunobstructedmovementintheverticalmeridianwhilenotmovinghorizontally.Thismeansthatthelensshouldbeabletomovefreelyupanddownwiththeblink,butnotsidetoside.Thelenswillbepusheddownonthecloseoftheblink,bepulledupontheopeningoftheblinkandthencomeslowlytorestinitsproperposition.