眼科学教学课件:07 英文版角膜病白内障PPT文件格式下载.pptx
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眼科学教学课件:07 英文版角膜病白内障PPT文件格式下载.pptx
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CORNEADISEASE,ThecorneaistheeyesopticalwindowthatmakesitpossibleforhumanstoseeTheOphthalmologistisonlyabletodiscernstructuresintheinterioroftheeyebecausethecorneaistransparentAt43diopters,thecorneaisthemostimportantrefractivemediumintheeye.,Shapeandlocation,ThecorneascurvatureisgreaterthanthesclerascurvatureItfitsintothescleralikeawatch-glasswithashallowsulcus(thelimbusofthecornea)markingthejunctionofthetwostructures.,Embryology,ThecornealtissueconsistsoffivelayersThecorneaandthescleraareformedduringthesecondmonthofembryonicdevelopmentTheepitheliumdevelopsfromectoderm,andthedeepercorneallayersdevelopfrommesenchyme,Morphologyandhealing,ThesurfaceofthecorneaisformedbystratifiednonkeratinizedsquamousepitheliumthatregeneratesquicklywheninjuredAnintactepitheliumprotectsagainstinfection,Morphologyandhealing,AthinbasementmembraneanchorsthebasalcellsofthestratifiedsquamousepitheliumtoBowmanslayerThislayerishighlyresistantbutcannotregenerateInjuriestoBowmanslayerusuallyproducecornealscarring,Morphologyandhealing,Thecornealstroma,BeneathBowmanslayer,manylamellaeofcollagenfibrilsformthecornealstromaThestromaisahighlydedydrateandavasculartissueItrepresents90%ofthecornealthinkness,Morphologyandhealing,Descemetsmembraneisarelativelystrongmembrane.Itwillcontinuetodefinetheshapeoftheanteriorchamberevenwherethecornealstromahascompletelymelted,Morphologyandhealing,ThecornealendotheliumisresponsibleforthetransparencyofthecorneaThecornealendotheliumdoesnotregenerate;@#@defectsintheendotheliumareclosedbycellenlargementandcellmigration.,Specularmicroscopypermitsapreciseendothelialcellcount(CD=2159endothelialellspermm2)whilesimultaneouslymeasuringthethicknessofthecornea(pachymetrypachy=572m,Keratitis,KeratitisoccupiesanimportantplaceinkeratopathyOneofmaincausesofblindnessAlmostallkeratitiesarecausedbyexternalinfections,Keratitis,lPathogenicfactorExternal:
@#@Trauma,Infection:
@#@Viruses,Bacteria,Acanthamoeba,Fungi.Internal:
@#@self-immunoreactionlClassification:
@#@classificationofkeratitisisntunifiedyetlThenomenclaturesusedinclinicatpresentdependsonetiology,illsiteandshape,ProtectiveMechanismsoftheCornea,ReflexiveeyeclosingFlushingeffectoftearfluid(lysozyme)ItshydrophobicepitheliumformsadiffusionbarrierEpitheliumcanregeneratequicklyandcompletely,Notissuenecrosis,Inflammationdevelops,surfacelayernecrosis,exfoliated,hypopyon,Anterior,posteriorsynechiaofiris,small,large,Fistulaformation,bacteriaentertheeye,Pathogenicfactor,Thepathogenicprocessofcornealinflammation,Diagnosisofkeratitis,lHistory:
@#@trauma,influenza,localorsystemicimmunosuppression,systemicdiseaselSymptoms:
@#@visualdecrease,pain,tearing,photophobia,blepharospasm,Sign:
@#@ciliary/mixedcongestion、cornealeademaandinfiltration、cornealulcer、2%fluoresceinpositivecornealstainFL(+),reactiveiridocylitis、secondaryglaucoma,Labexamination,Identifyingthepathogenandtestingitsresistance.ThisisdonebytakingasmearfromthebaseoftheulcertoobtainsamplematerialandinoculatingculturemediaforbacteriaandfungiWearersofcontactlensesshouldalsohaveculturestakenfromthelensestoensurethattheyarenotthesourceofthebacteriaorfungus.,Labexamination,Slidesofsmears,unstainedandtreatedwithGramandGiemsastains,areexaminedtodetectbacteriaWhereaviralinfectionissuspected,testingcornealsensitivityisindicatedasthiswillbediminishedinviralkeratitis,Principleoftreatment,PathogeniccausemustbeeliminatedSelectsuitableantibioticorantiviralagentsTopicalinstillationfrequentlyorbulbarsubconjunctivalinjectionarerationalwaytousethesemedicinesMydriasiswithatropine,Secondarydiseasetreatment,DerceasecornealscarNebula:
@#@thinandtranslucentscarCornealmacula:
@#@relativethickoneLeukoma:
@#@verythickwhitishone,Secondarydiseasetreatment,SecondaryglaucomashouldbetreatedbysurgerySeverelyimpairsvision,opticaliridectomyorcornealgraftingshouldbedone,BacterialKeratitis,Over90%ofallcornealinflammationsarecausedbybacteriaThepathogenslistedareamongthemostfrequentcausesofbacterialkeratitisintheurbanpopulationintemperateclimates.,StaphylococcusaureusInfectionprogressesslowlywithlittlepainStaphylococcusepidermidisAsinStaphylococcusaureusinfectionStreptococcuspneumoniaTypicalserpiginouscornealulcer:
@#@thecorneaisrapidlyperforatedwithearlyintraocularinvolvement;@#@verypainful,PseudomonasaeruginosaBluishgreenmucoidexudate,occasionallywitharingshapedcornealabscess.ProgressionisrapidwithatendencytowardmeltingofthecorneaoverawideareapainfulMoraxellaPainlessovalulcerintheinferiorcorneathatprogressesslowlywithslightirritationof
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