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Adhesions of the Eye’s Iris and Swelling of Eye in Cats

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Iris Bombe - Complete Posterior Synechiae in Cat


Synechiae are adhesions between the iris and other structures in the eye, either the cornea or lens. Iris bombe occurs when there is a complete adhesion between the cat’s iris and the capsule of the lens of the eye, creating a 360 degree area of adhesion. This degree of adhesion results in a billowing of the iris forward into the eye.


Symptoms and Types


Symptoms seen with iris bombe include:


  • Eye bulging
  • Eye pain
  • Red eyes
  • Squinting
  • Corneal lesions, such as ulcers
  • Excessive tearing and discharge
  • Glaucoma
  • Variation in the color of the iris
  • Opacity of the lens
  • Uveitis
  • Decreased papillary reaction to light




  • Cat fight injury
  • Chronic infection
  • Corneal ulcer
  • Foreign body injury to the eye
  • Hyphema (bleeding in the front part of the eye)
  • Penetrating wounds to the eye
  • Surgery




Diagnosis is based on an ophthalmic examination, which involves examining the structures of the eye. Tonometry may be performed to measure the intraocular pressure (the pressure within the eyeball).



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