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Iris Bombe in Dogs

Complete Posterior Synechiae in Dogs

Synechiae refer to the abnormal adhesions formed between the iris and other ocular structures. Iris bombe develops when there is a total adhesion between the iris and the lens capsule, leading to a complete 360-degree area of attachment. Consequently, the iris protrudes forward into the eye, creating a billowing effect. Iris bombe can manifest in both dogs and cats.

Symptoms and Types

The signs associated with iris bombe comprise:

  • Squinting
  • Corneal lesions, such as ulcers
  • Excessive tearing
  • Glaucoma
  • Changes in the color of the iris
  • Opacity of the lens
  • Uveitis
  • Reduced papillary response to light


The origins of iris bombe may include:

  • Persistent infection
  • Corneal ulcers
  • Injury from foreign bodies to the eye
  • Hyphema (blood accumulation in the anterior chamber of the eye)
  • Penetrating eye wounds
  • Surgical procedures


Identifying iris bombe relies on an ophthalmic evaluation, which entails inspecting the eye’s structures. Tonometry might be conducted to gauge the intraocular pressure (the pressure inside the eye).


In certain instances, treatment may not be required. Nevertheless, when glaucoma arises, intervention becomes imperative. In such scenarios, laser surgery might be essential to alleviate the adhesions.

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