白内障英文课件.ppt

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1、DiseaseofthelensEYENo.11广西医科大学第一临床医学院眼科AnatomyandPhysiologyofthelensPosition:Thelensconnectedwiththeciliarybodybythesuspensoryligamentthatfixesitbehindtheiris,infrontofthevitreous.EYENo.22Anatomy:Thelensiscomposedoflenscapsuleandlensfiber.Thelenscapsuleisalayerof

2、elastichomogeneousmembrane.Thelensfibersaretheextensionandelongationforwardsandbackwardsoftheepithelialcellsattheequator.3Itisapproximately9mmindiameterand4-5mminthethickness.Butweonlyuse2.5-4mminthecenter(becausetheiriskeepsouttherestlensandonlycanviewsthecenter

3、portionthroughthepupil.)4PhysiologyofthelensThelensisskindoftransparentandnon-bloodvesseltissue.Itisanimportantpartofrefractivemediaoftheglobe.Thelens’nourishmentareofferedbyaqueoushumor.5Thedisorderofthelenscommonlyiflossofitstransparency(cataract)andabnormality

4、ofitsposition;bothcaninduceseverevisualdisturbance.6CataractCataractisthefirstcauseofblindnessinChinaandothermanydevelopingcountry.Thereareonemillionofcataractsuffererwhoareinneedofoperationtorestoretheirvisions.EYENo.47ClassificationAccordingtotheageofoccurring:

5、CongenitalcataractInfantilecataractJuvenilecataractAdultcataractAge-relatedcataract(senile)EYENo.58Accordingtoetiology:Traumaticcataract:bluntorpenetratinginjuryComplicatedcataract:uveitisMetaboliccataract:diabetesDrug-inducedortoxiccataractDevelopingcataractAfte

6、r-cataract9age-relatedcataractItisthemostcommoncataract,oftenseenintheoldswithagemorethan50yearsold.Theincidenceofthediseaseis100%whenthepatientexceed80yearsold.EYENo.610PathologicmechanismThediseaseisrelatedwithseveralfactor:UltravioletrayGeneticfactorSystemicdi

7、seasesuchasdiabetes,hypertension.Lensnourishmentandmetaboliccondition11Clinicalfindings:BilateraldiseaseFixedblackspotbeforetheeyesVisualdecreasewithoutpainRefractivechangeEYENo.712classificationAccordingtothesitewherecataractbeginstoform:corticalAnteriorcapsuleP

8、osteriorcapsulesubcapsularAge-relatedcataractEYENo.8nuclear13corticalcataractItisdividedinto4stages:Incipientstage:Tobeginopacityappearsattheperipheryofanterio