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Synechiae in Dogs

Dogs Adhesions of the Iris of the Eye in Dogs

Synechiae, observed in both dogs and cats, refer to adhesions formed between the iris and other ocular structures. These adhesions develop due to inflammation within the iris, often associated with anterior uveitis (inflammation of the eye’s dark tissues) or eye trauma.

Symptoms and Types

Synechiae can manifest as either anterior or posterior in nature. Anterior synechiae refers to the attachment between the iris and the cornea, the transparent covering of the eye’s front. Posterior synechiae involve the adherence of the iris to the lens capsule. Symptoms associated with synechiae include squinting, corneal ulcers, increased tear production, glaucoma, iris color changes, lens opacity, uveitis, and reduced pupillary response to light.


The causes of synechiae include injuries from cat fights, chronic infections, corneal ulcers, foreign objects in the eye, hyphema (bleeding in the front part of the eye), penetrating eye wounds, and surgical procedures.


The diagnosis of synechiae relies on an ophthalmic evaluation, which entails the examination of eye structures. Furthermore, corneal dyes may be employed to identify corneal injuries, while tonometry may be conducted to assess intraocular pressure (the pressure inside the eyeball).


In numerous instances, treatment may not be required. However, if an underlying cause is identified, it should be addressed accordingly. When glaucoma is present, laser surgery may be attempted to correct the synechiae.

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