. Dr. Evans' How to keep well; . e general causes of ac-quired squint are imperfect vision in one eye from opacities of the cornea ordiseases of the choroid, retina, or optic nerve, rendering it unable to par-ticipate in binocular single vision. Causes of paralytic squint may affect either the muscles themselves, thenerve trunks, or the nerve centers. Lesions of the nerve trunks are mostfrequent and are caused by syphilis, rheumatism, hemorrhage, tumors, alco-holism, influenza, and other acute diseases. Paralytic squint may be congeni-tal. In the early stages of paralytic squint the treatment
. Dr. Evans' How to keep well; . e general causes of ac-quired squint are imperfect vision in one eye from opacities of the cornea ordiseases of the choroid, retina, or optic nerve, rendering it unable to par-ticipate in binocular single vision. Causes of paralytic squint may affect either the muscles themselves, thenerve trunks, or the nerve centers. Lesions of the nerve trunks are mostfrequent and are caused by syphilis, rheumatism, hemorrhage, tumors, alco-holism, influenza, and other acute diseases. Paralytic squint may be congeni-tal. In the early stages of paralytic squint the treatment will depend uponthe cause. ISTon-paralytic squint is more common and occurs in early childhood. Itis convergent; that is, one eye turns in toward the nose. The defect ismanifested early in life—in fact, when the child begins to use his eyes fornear vision, looking at picture books, etc. The majority of such childrendevelop a squint before the age of three. As a rule the squint develops slowly, and the parents are not the first. SQUINT 125 to notice it. They generally assign as the cause an illness such as measles orthe imitation of a squinting companion. In some cases we observe the squint only when the child gazes on anear subject. In others the squint is constant, but more marked when thefocusing power is brought into play or when the child is tired. Most chil-dren who see equally well with each eye often squint with either indifferently. Contrary to the common belief, children seldom grow out of it. Ifneglected, the squinting eye usually becomes blind from disuse. Neglectedcross eyes are responsible for many blind eyes in adults. If prescribed sufficiently early, correct glasses accomplish cures in manyof the cases. Even very young children can wear glasses without danger. The treatment by glasses,which is so efficacious in theyoung, is naturally much lessso in older patients who havehad squint for some years, andthen operative interference isnecessary. The condition where
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