LECTURE II.—STRAIN OF THE OCULAR MUSCLES IN BINOCULAR VISION.
Second Group:—The ocular affections to which I wish to invite your attention to-day, create disturbances in the nervous system also by strained muscular action. But while a person with abnormal refraction may suffer from nervous symptoms whether he sees with one eye or with both, the group of affections now before us can trouble the person only when he uses both eyes together. The nervous symptoms caused by this second group are due to unusual demands upon the ocular muscles to maintain binocular vision.
Binocular vision is only possible if the visual line of each eye (i. e. the straight line drawn from the macula through the center of rotation of the eye) connects the macula with the object, or as it is usually expressed, both eyes must be turned directly towards the object. The slightest deviation of the one visual
HOTZ FC. EYE TROUBLES WHICH CONSTITUTE A FREQUENT SOURCE OF HEADACHE, VERTIGO AND NAUSEA, AND OTHER NERVOUS DISORDERS.Series of four lectures delivered at the Fourth Special Course of the Chicago Policlinic. JAMA. 1893;XX(3):67–70. doi:10.1001/jama.1893.02420300013001e
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