Issue Description A small hollow structure either attached to
the iris of the eye or floating free in the anterior chamber. An iris
cyst is composed of a single cell layer of epithelium and is filled
with fluid. It is most commonly seen as secondary to inflammation in
the eye, especially with glaucoma. Other Names Iris Cyst
Breeds Affected Golden Retrievers, Labrador Retrievers, and
Boston Terriers are the most commonly affected breeds.
Symptoms Iris cysts usually cause no symptoms, but in
large numbers they can cause glaucoma by obstructing the drainage
angle of the eye.
Diagnosis Iris cysts need to be differentiated from iris
melanoma, a tumor, by demonstrating their hollowness.
Treatment A light directed at an iris cyst will cause it
to transilluminate. Iris cysts can be collapsed if necessary by a
veterinarian with a small needle carefully introduced into the
anterior chamber. The cysts may also be destroyed by use of a
semiconductor diode laser.