used as pesticides throughout the world, and many unfortunate incidents of acute intoxication have been reported (Grob and Harvey, I953; Goldman and Teitel, I958; Healy, 1959; Dinman, I964; Quinby, I964; Crowley and Johns, I966; Eye symptoms include spasm of the ciliary muscle and constriction of the pupil (Namba, Nolte, Jackrel, and Grob, 197I). Recent evidence of chronic intoxication (Namba and others, 1971; Ishikawa, I97I) due to environmental exposure to the compounds has also indicated a severe effect on refraction, i.e. permanent myopia (Ishikawa and Ohto, 1973).
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Suzuki et al. (1974) studied this question.