disease of lens. anatomy lens capsule + lens fibe character transparent avascular avascular...
TRANSCRIPT
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Disease of lensDisease of lens
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Anatomy Anatomy lens capsule + lens fibelens capsule + lens fibe
CharacterCharacter transparenttransparent
avascular avascular
nourishment come from aqueous humornourishment come from aqueous humor
LensLens
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CataractCataract
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General description of cataractGeneral description of cataract
DefinitionDefinition When there are changes of When there are changes of aqueous humor componentaqueous humor component
osmotic character of lens capsuleosmotic character of lens capsule
metabolic disturbancemetabolic disturbance
caused by various factorscaused by various factors
lens protein lens protein degenerationdegeneration
transparent lens becomes opaquetransparent lens becomes opaque
called cataractcalled cataract
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According to According to
CauseCause age-related traumatic complicated age-related traumatic complicated
Age occurredAge occurred congenital acquired congenital acquired
Site of opacitySite of opacity nuclear cortical capsular subcapsular nuclear cortical capsular subcapsular
Shape of opacityShape of opacity punctate coronary lamellar punctate coronary lamellar
Degree of opacityDegree of opacity incipient immature mature hypermature incipient immature mature hypermature
ClassificationClassification
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Clinical findingsClinical findings
Progressive blurred vision Progressive blurred vision
Contrast sensitivity changeContrast sensitivity change
Increase in the refractive indexIncrease in the refractive index
Monocular diplopia or polyopiaMonocular diplopia or polyopia
DazzleDazzle
Change of color sensationChange of color sensation
Defect of visual fieldDefect of visual field
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Age-related cataract (senile Age-related cataract (senile
cataract)cataract)
Clinical findingsClinical findings
progressive blurred visionprogressive blurred vision
3 categories3 categories
cortical cataractcortical cataract
nuclear cataract nuclear cataract
subcapsular cataract subcapsular cataract
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Cortical cataractCortical cataract
4 stages4 stages
incipient stageincipient stage
intumescent stage or immature stageintumescent stage or immature stage
mature stagemature stage
hypermature stagehypermature stage
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Incipient stageIncipient stage
cuneiform opacity in peripheralcuneiform opacity in peripheral
tip towards to centretip towards to centre
pupillary area not affected pupillary area not affected
difficult to find without mydriasisdifficult to find without mydriasis
no blurred vision take placeno blurred vision take place
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Intumescent stageIntumescent stage
uneven milk-white opacityuneven milk-white opacity
vision decrease obviouslyvision decrease obviously
fundus difficult to be seenfundus difficult to be seen
swollen cortex ---push iris forwardswollen cortex ---push iris forward
---shallow anterior chamber------shallow anterior chamber---
glaucomaglaucoma
be careful to mydriasisbe careful to mydriasis
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maturemature stagestage
entire lens appear as grey-white opacityentire lens appear as grey-white opacity
fundus can not to be seenfundus can not to be seen
vision decrease to FC or HMvision decrease to FC or HM
swollen cortex decrease---normal anterior chamberswollen cortex decrease---normal anterior chamber
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Hypermature stage—Morgagni cataractHypermature stage—Morgagni cataract
cortex fibers decomposed cortex fibers decomposed
entire lens reduced capsule shrankentire lens reduced capsule shrank
nucleus fallen downnucleus fallen down
anterior chamber become deeper anterior chamber become deeper
iridodonesisiridodonesis
vision increasevision increase
lens-induced uveitislens-induced uveitis
Phacolytic glaucomaPhacolytic glaucoma
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nuclear cataractnuclear cataract
develop slowlydevelop slowly
from embryonic nucleus to adult’s nucleusfrom embryonic nucleus to adult’s nucleus
grey-yellowish in centre grey-yellowish in centre
less affect vision in early stageless affect vision in early stage
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Posterior subcapsular cataractPosterior subcapsular cataract
at subcapsular cortex in posterior pole of lens at subcapsular cortex in posterior pole of lens
appear as plate shapeappear as plate shape
blurred vision take place in early stageblurred vision take place in early stage
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Congenital cataractCongenital cataract
EtiologyEtiologyGenetic factor Genetic factor
autosomal dominant inheritanceautosomal dominant inheritance
Environmental factorEnvironmental factor
viral infection rubellaviral infection rubella
nourishment disturbance Vit Dnourishment disturbance Vit D
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Morphology Morphology
anterior polar cataractanterior polar cataract
posterior polar cataractposterior polar cataract
perinuclear or zonular cataractperinuclear or zonular cataract
coronary cataractcoronary cataract
total cataracttotal cataract
Congenital cataractCongenital cataract
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Complicated cataractComplicated cataract
Induced by ocular inflammation or
degenerative disorders
Anterior segment disorder---cortex opaque
Posterior segment disorder---nucleus opaque
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Metabolic cataractMetabolic cataract
diabetic cataractdiabetic cataract
galactose cataractgalactose cataract
tetany cataracttetany cataract
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Diabetic cataractDiabetic cataract
Combine with senile cataractCombine with senile cataract
Single diabetic cataract Single diabetic cataract
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Tetany cataractTetany cataract
Hypocalcemia Hypocalcemia
After extraction of parathyroid After extraction of parathyroid
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Drug-induced or toxic cataractDrug-induced or toxic cataract
Glucocorticosteroid cataractGlucocorticosteroid cataract
Chlorpromazine cataractChlorpromazine cataract
Miotic cataractMiotic cataract
Trinitrotoluence cataractTrinitrotoluence cataract
Metal-induced cataractMetal-induced cataract
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Traumatic cataractTraumatic cataract
Contusive cataractContusive cataract
Penetrating cataractPenetrating cataract
Radiative cataractRadiative cataract
Electric cataractElectric cataract
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After cataractAfter cataract
After extracapsular cataract extraction After extracapsular cataract extraction
or aspiration of lens or aspiration of lens
Symptom blurred visionSymptom blurred vision
Treatment YAG laserTreatment YAG laser
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Dislocated lensDislocated lens
Hereditary lens dislocation
Traumatic lens dislocation
partial dislocation partial dislocation
completely dislocation completely dislocation
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Surgery of cataractSurgery of cataract
OccasionOccasion
ExaminationExamination
Method Method
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Surgery proceduresSurgery procedures
Intracapsular cataract extraction Extracapsular Intracapsular cataract extraction Extracapsular
cataract extraction + IOL implantation cataract extraction + IOL implantation
ECCE + IOLECCE + IOL
Phacoemulsifaction + IOL implantationPhacoemulsifaction + IOL implantation
PHACO + IOLPHACO + IOL
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Intracapsular cataract extractionIntracapsular cataract extraction
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白内障现代囊外摘除术 +人工晶体植入术 ECCE+IOL
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PHACO + IOLPHACO + IOL
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SUMMARY
CATARACTCATARACT
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I.I.Classification of cataractClassification of cataract
※※ Congenital cataractCongenital cataract
※※ Senile cataractSenile cataract
※※ Traumatic cataractTraumatic cataract
※※ Secondary cataractSecondary cataract
※※ Complicated Complicated cataractcataract
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((一一 ) ) Cortical Cortical cataractcataract 1. incipient stage 2. premature stage 3. mature stage 4. hypermature stage
(( 二二 ) ) Neuclear Neuclear cataractcataract
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II.II.Diagnosis of cataractDiagnosis of cataract
(1) age(1) age
(2) gradual decrease of vision(2) gradual decrease of vision
(3) lens opacity(3) lens opacity
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III.III.Treatment of cataractTreatment of cataract
operation methods:operation methods:
•Intracapsular cataract extraction (ICCE)
•Extracapsular cataract extraction (ECCE)
•PhacoemusificationPhacoemusification
ECCE+IOLECCE+IOL
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Thank You !