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Exposure at close range is particularly dangerous
EDITOR,--Jean-Paul Yih's editorial on injuries to the eye caused by O-chlorobenzylidene malono-nitrile (CS) gas, or tear gas, draws attention to the short term effects of the gas on the eye and suggests that such injuries may well be a future problem as individual police officers in Britain will soon be carrying pocket aerosols of CS gas. 1 Yih implies that the ocular toxicity of CS gas is rapidly reversible; however, the ocular irritation from 1-chloroacetophenone (another tear gas agent) typically lasts only 15 minutes but may persist for up to three days....