Diseases of the nervous system : a text-book of neurology and psychiatry . Normal Eye-ground (average tint). (Norris and Oliver.) Fig. 2. Ophthalmoscopic Appearances in Early Stage of Optic Neuritis. (Norris and Oliver.) DISEASES OF THE OPTIC PATHWAYS 189 Etiology.—The chief causes are alcohol and tobacco. Other lessfrequent poisonings are by carbon bisulphide, in the rubber indus-tries, arsenic, lead, sulphuric acid,anemia (anchylostoma), diabetes,aniline, gasoline. Hereditary Forms.—These oc-cupy intermediary positions. Onetype affects usually the males,passing through unaffected females(Kni
Diseases of the nervous system : a text-book of neurology and psychiatry . Normal Eye-ground (average tint). (Norris and Oliver.) Fig. 2. Ophthalmoscopic Appearances in Early Stage of Optic Neuritis. (Norris and Oliver.) DISEASES OF THE OPTIC PATHWAYS 189 Etiology.—The chief causes are alcohol and tobacco. Other lessfrequent poisonings are by carbon bisulphide, in the rubber indus-tries, arsenic, lead, sulphuric acid,anemia (anchylostoma), diabetes,aniline, gasoline. Hereditary Forms.—These oc-cupy intermediary positions. Onetype affects usually the males,passing through unaffected females(Knights move in heredity). Thesedevelop acute or subacute head-aches about the age of 20, withgradually diminishing vision. Un-equal bilateral scotomata appearand gradually increasing centralblindness. There is usually asubacute and progressive stage forabout six months, one eye laggingbehind the other in its deterioration. Gradually increasing central sco-tomata show. Nyctalopia is fre-quent. The marginal vision isretained, save for colors. Totalblindness develops in about two-thirds of the cases. One-thirdremain more or less sta
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