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October 19, 1964

Laser Warning Sign

Author Affiliations

University of Oregon Dental School Portland, Ore

JAMA. 1964;190(3):253. doi:10.1001/jama.1964.03070160077029

To the Editor:—  Some 500 groups in the United States—involving as many as several thousand people—now work with lasers.1 Many investigators are apparently unaware of, or scantily appreciate, the energy levels of such devices. However, there is increasing concern about the little-known dangers from acute, and especially chronic, exposure to laser light or coherent radiation,2,3 including visual impairment and laser-induced blindness. The need for knowledge about these hazards applies, in particular, to those personnel outside the biosciences.We propose as an analog of the universally used, recognized, and accepted radioactivity warning sign a standard laser-light warning sign. This is an appropriate and distinctive laser symbol together with the word CAUTION or DANGER above that symbol and the expression LASER LIGHT below the device. The sign is simple and can be of any convenient size. The warning symbol has an arrow representing laser light emitted from a stylized trumpet-like

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