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Cataract

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cataract surgery and affection in pets

cataract surgery and affection in pets

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  • 1. Cataract Opacity of lens is known as cataractCataracts are the most common cause of treatable blindness in dogs
  • 2.  severe cataracts cause blindness By disrupting the ability of the lens to focus light rays onto the retina toy poodle, miniature and standard poodle, English cocker
  • 3.  Spaniel, Boston terrier, golden retriever, rottweiler, Labrador retriever, Miniature schnauzer, bichon frise, and chow chow
  • 4.  prevalence of cataracts increases with age in dogs Diabetes mellitus is the second most common cause of cataracts in the dog less common causes include other metabolic diseases, toxins, drugs, congenital abnormalities, dietary deficiencies, trauma, radiation therapy, and aging
  • 5. Tapetum Eyeshine occurs in a wide variety of colors including blue, green, yellow, pink and red.
  • 6.  Incipient cataracts involves <10% to 15% of the lens
  • 7.  Immature cataracts vary widely in appearance and may affect only a small portion of the lens to almost the entire lens
  • 8.  By definition, a tapetal reflection is apparent with immature cataracts, although vision may be diminished if the cataract is well developed.
  • 9. A mature cataractaffects the entire lensA mature cataractappears as a solidwhite opacity of thelens, and affected dogsare severely impairedvisually
  • 10.  Hypermature cataracts have undergone liquefaction and resorptionHypermature cataracts often have a crystalline appearancewith wrinkling of the lens capsule
  • 11. A tapetal reflection mayor may not be present.Vision with hypermaturecataracts is variabledepending upon thedegree of liquefaction.
  • 12.  Congenital/ aquired Complete/ partial Stationary / progressive Senile/toxic Juvenile cataract – prognosis is good
  • 13.  Capsular/ cortical/ lamellar(bet. Lens nucleus and cortex)/nuclear/diff use(entire lens substance)
  • 14.  Themost common treatment for cataracts is surgical removal by phacoemulsification.(Phaco- lens and emulsification- liquifying/ breaking)
  • 15.  Tests indicated prior to surgery include a complete ophthalmic examination, complete blood count, biochemical panel, urinalysis, electroretinography (ERG), and ocular ultrasonography.
  • 16.  Discission/ Treatment needling : ant . Capsule is incised in cruciate fashion, using a cataract needle – aqu.humour in contact with lens substance- facilitate resorption – repeated many times
  • 17.  Removal of lens : intracapsular (with capsule)- difficult in animals – sus.lig is tough Extra capsular (without capsule)- successful
  • 18. Procedure Extracapsular: fix the eye ball Canthotomy may be done to increase the exposure Incise the cornea at limbus- graefe’s knife/ scissors Incise the anterior capsule of lens Catract scoop is used to remove the lens substance Suture the corneal wound In man dissolution of the opaque lens by using 0.02% trypsine has been reported.