![]() ![]() When the tissue attachment releases, the gland rises up and becomes visible at the leading edge of the third eyelid. The gland is normally attached out of sight to the base of the third eyelid, at the inside corner of the eye. The prolapse occurs due to a weakness of the connective tissues that hold the gland in place. This disorder is caused by mutation of the paired-like homeodomain 2 (PITX2) gene. Iris hypoplasia (IH) is rare autosomal dominant disorder characterized by a poorly developed iris stroma and malformations of the eyes and umbilicus. Some animals only recover partially and recurrence is rare. The prognosis for idiopathic diseases is generally good with spontaneous improvement typically occurring within 8 weeks. There is no known treatment for horner syndrome itself. How is Horner’s syndrome treated in dogs? Microphthalmia results from a vitamin A deficiency during gestation which produces under-developed eyes that are smaller than normal. Microphthalmia is an inherited eye disease affecting dogs.
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