The eyeball is comprised of several structures including the cornea, iris, lens, chambers, and the retina. The eyeball is located within the bony socket of the head and is partially protected by the three eyelids.
Microphthalmia is a condition in which the eyeball is smaller than normal. Usually, the internal structures of the eyeball are abnormal as well. Microphthalmia is inherited in Australian Shepherds, Great Danes, Beagles, Collies, Borzoi, Dobermans, Sealyham Terriers, Bedlington Terriers, Portuguese Water Dogs, Shelties, Akitas, Miniature Schnauzers, Labrador Retrievers, Dachshunds, and Cavalier King Cocker Spaniels.
Microphthalmia can also occur in newborns whose mothers received certain medications during pregnancy.
What are the symptoms?
The eyeball will appear smaller than normal for the breed. Signs of visual impairment will also be noticed.
What are the risks?
Many dogs become visually impaired or completely blind.
What is the management?
There is no treatment, and affected individuals should not be bred.