A system was established for the evaluation of sources of optical radiation with respect to recommended ocular exposure limits. This system consists of a diode array radiometer calibrated for absolute radiometric measurements and software for the application of the currently accepted threshold limits for exposure to various wavelengths of radiation. Absolute calibration of the array radiometer was accomplished to within 3% of values obtained with a conventional instrument. Day-to-day repeatability of the instrument indicates the possibility of absolute calibration of the detector array responsivity for everyday use in the measurements of continuous sources to an accuracy of plus-or-minus 2.8%. It was also determined that the output of several optical sources used in amateur photography can exceed the retinal thermal Threshold Limit Value. One typical 35-mm photographic flash exceeded the threshold at a range of 3 m. Other threshold expressions were not exceeded at significant distances or exposure durations for these sources.

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The abstract of this article may alsobe accesssed at: http://www.imaging.org/store/epub.cfm?abstrid=2822 ISSN:0747-3583 Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

Document Type


Department, Program, or Center

Chester F. Carlson Center for Imaging Science (COS)


RIT – Main Campus