## Overview Medial strabismus is an inward deviation of the eye. In some Appaloosas it can be a normal breed variation. Acute onset suggests paralysis of the lateral rectus muscle from cranial nerve VI damage, which can result from brain disease, equine protozoal myeloencephalitis, or trauma. ## Causes Congenital variation or acquired abducens nerve paralysis. ## Diagnosis Observation of eye position, neurologic examination, and further testing if acute or accompanied by other neurologic signs. ## Treatment None for congenital variation. Treat the underlying neurologic disease if acquired. ## Recovery and Prognosis Depends on the cause. Congenital cases are static. Acquired cases vary with the primary disease. ## Prevention Depends on etiology.
eye turned inward; may be normal in some Appaloosas; acute onset suggests cranial nerve VI damage
## Overview Medial strabismus is an inward deviation of the eye. In some Appaloosas it can be a normal breed variation. Acute onset suggests paralysis of the lateral rectus muscle from cranial nerve VI damage, which can result from brain disease, equine protozoal myeloencephalitis, or trauma. ## Causes Congenital variation or acquired abducens nerve paralysis. ## Diagnosis Observation of eye position, neurologic examination, and further testing if acute or accompanied by other neurologic signs. ## Treatment None for congenital variation. Treat the underlying neurologic disease if acquired. ## Recovery and Prognosis Depends on the cause. Congenital cases are static. Acquired cases vary with the primary disease. ## Prevention Depends on etiology.
eye turned inward; may be normal in some Appaloosas; acute onset suggests cranial nerve VI damage