1 / 61

Disease of lens

Disease of lens. Lens. Anatomy lens capsule + lens fibe Character transparent avascular nourishment come from aqueous humor. Cataract. General description of cataract Definition When there are changes of aqueous humor component

fruma
Download Presentation

Disease of lens

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Disease of lens

  2. Lens Anatomy lens capsule + lens fibe Charactertransparent avascular nourishment come from aqueous humor

  3. Cataract

  4. General description of cataract Definition When there are changes of aqueous humor component osmotic character of lens capsule metabolic disturbance caused by various factors lens protein degeneration transparent lens becomes opaque called cataract

  5. According to Classification Cause age-related traumatic complicated Age occurred congenital acquired Site of opacity nuclear cortical capsular subcapsular Shape of opacity punctate coronary lamellar Degree of opacity incipient immature mature hypermature

  6. Clinical findings Progressive blurred vision Contrast sensitivity change Increase in the refractive index Monocular diplopia or polyopia Dazzle Change of color sensation Defect of visual field

  7. Age-related cataract (senile cataract)Clinical findingsprogressive blurred vision3 categoriescortical cataractnuclear cataract subcapsular cataract

  8. Cortical cataract • 4 stages • incipient stage • intumescent stage or immature stage • mature stage • hypermature stage

  9. Incipient stage cuneiform opacity in peripheral tip towards to centre pupillary area not affected difficult to find without mydriasis no blurred vision take place

  10. Intumescent stage uneven milk-white opacity vision decrease obviously fundus difficult to be seen swollen cortex ---push iris forward ---shallow anterior chamber---glaucoma be careful to mydriasis

  11. maturestage • entire lens appear as grey-white opacity • fundus can not to be seen • vision decrease to FC or HM • swollen cortex decrease---normal anterior chamber

  12. Hypermature stage—Morgagni cataract • cortex fibers decomposed • entire lens reduced capsule shrank • nucleus fallen down • anterior chamber become deeper • iridodonesis • vision increase • lens-induced uveitis • Phacolytic glaucoma

  13. nuclear cataract • develop slowly • from embryonic nucleus to adult’s nucleus • grey-yellowish in centre • less affect vision in early stage

  14. Posterior subcapsular cataract • at subcapsular cortex in posterior pole of lens • appear as plate shape • blurred vision take place in early stage

  15. Congenital cataract Etiology Genetic factor autosomal dominant inheritance Environmental factor viral infection rubella nourishment disturbance Vit D

  16. Congenital cataract • Morphology • anterior polar cataract • posterior polar cataract • perinuclear or zonular cataract • coronary cataract • total cataract

  17. Complicated cataract • Induced by ocular inflammation or degenerative disorders • Anterior segment disorder---cortex opaque • Posterior segment disorder---nucleus opaque

  18. Metabolic cataract • diabetic cataract • galactose cataract • tetany cataract

  19. Diabetic cataract • Combine with senile cataract • Single diabetic cataract

  20. Tetany cataract • Hypocalcemia • After extraction of parathyroid

  21. Drug-induced or toxic cataract • Glucocorticosteroid cataract • Chlorpromazine cataract • Miotic cataract • Trinitrotoluence cataract • Metal-induced cataract

  22. Traumatic cataract • Contusive cataract • Penetrating cataract • Radiative cataract • Electric cataract

  23. After cataract • After extracapsular cataract extraction or aspiration of lens • Symptom blurred vision • Treatment YAG laser

  24. Dislocated lens • Hereditary lens dislocation • Traumatic lens dislocation partial dislocation completely dislocation

  25. Surgery of cataract Occasion Examination Method

  26. Surgery procedures • Intracapsular cataract extraction Extracapsular • cataract extraction + IOL implantation ECCE + IOL • Phacoemulsifaction + IOL implantation PHACO + IOL

  27. Intracapsular cataract extraction

  28. 人工晶状体

  29. 白内障现代囊外摘除术+人工晶体植入术ECCE+IOL

More Related