Certified Ophthalmic Medical Technologist (COMT) Practice Exam

Horner's Syndrome is characterized by a triad of symptoms resulting from damage to the sympathetic nerves supplying the eye and surrounding structures. One of the hallmark features is miosis, which is the constriction of the pupil in the affected eye. In the case of Horner's Syndrome, this occurs due to the loss of sympathetic innervation, leading to an imbalance between sympathetic and parasympathetic stimulation. The other symptoms associated with this syndrome include ptosis (drooping of the upper eyelid) and anhidrosis (lack of sweating) on the affected side of the face. While diplopia (double vision) and photophobia (sensitivity to light) can result from other eye conditions, they are not direct characteristics of Horner's Syndrome. Exophthalmos, or protrusion of the eyeball, is also not associated with Horner's; in fact, in this syndrome, there may be a slight ptosis or retraction of the eye instead, depending on the specific case. Therefore, miosis remains the key identifying feature of Horner's Syndrome.