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1、1DiseaseofthelensEYENo.12AnatomyandPhysiologyofthelensPosition:Thelensconnectedwiththeciliarybodybythesuspensoryligamentthatfixesitbehindtheiris,infrontofthevitreous.EYENo.23Anatomy:Thelensiscomposedoflenscapsuleandlensfiber.Thelenscapsuleisalayerofelastichomogeneousmembrane.Thelensfibersaretheexte
2、nsionandelongationforwardsandbackwardsoftheepithelialcellsattheequator.4Itisapproximately9mmindiameterand4-5mminthethickness.Butweonlyuse2.5-4mminthecenter(becausetheiriskeepsouttherestlensandonlycanviewsthecenterportionthroughthepupil.)5PhysiologyofthelensThelensisskindoftransparentandnon-bloodves
3、seltissue.Itisanimportantpartofrefractivemediaoftheglobe.Thelens’nourishmentareofferedbyaqueoushumor.6Thedisorderofthelenscommonlyiflossofitstransparency(cataract)andabnormalityofitsposition;bothcaninduceseverevisualdisturbance.7CataractCataractisthefirstcauseofblindnessinChinaandothermanydevelopin
4、gcountry.Thereareonemillionofcataractsuffererwhoareinneedofoperationtorestoretheirvisions.EYENo.48ClassificationAccordingtotheageofoccurring:CongenitalcataractInfantilecataractJuvenilecataractAdultcataractAge-relatedcataract(senile)EYENo.59Accordingtoetiology:Traumaticcataract:bluntorpenetratinginj
5、uryComplicatedcataract:uveitisMetaboliccataract:diabetesDrug-inducedortoxiccataractDevelopingcataractAfter-cataract10age-relatedcataractItisthemostcommoncataract,oftenseenintheoldswithagemorethan50yearsold.Theincidenceofthediseaseis100%whenthepatientexceed80yearsold.EYENo.611PathologicmechanismThed
6、iseaseisrelatedwithseveralfactor:UltravioletrayGeneticfactorSystemicdiseasesuchasdiabetes,hypertension.Lensnourishmentandmetaboliccondition12Clinicalfindings:BilateraldiseaseFixedblackspotbeforetheeyesVisualdecreasewithoutpainRefractivechangeEYENo.713classificationAccordingtothesitewherecataractbeg
7、instoform:corticalAnteriorcapsulePosteriorcapsulesubcapsularAge-relatedcataractEYENo.8nuclear14corticalcataractItisdividedinto4stages:Incipientstage:Tobeginopacityappearsattheperipheryofanteriorandposterior
