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Visual comfort probability (VCP), also known as Guth Visual Comfort Probability, is a metric used to rate lighting scenes. It is defined as the percentage of people that will find a certain scene (viewpoint and direction) comfortable with regard to visual glare. [1][2] It was defined by Sylvester K. Guth in 1963. [3][4]


  1. ^ Visual Comfort and Productivity,; retrieved February 16, 2014 via Wayback Machine
  2. ^ Ward, G.J. (1991). "RADIANCE Visual Comfort Calculation". Rapport interne, LESO, EPFL.
  3. ^ Guth, SK (1963). "A method for the evaluation of discomfort glare". Illuminating Engineering. 58 (5): 351–364.
  4. ^ Guth, Sylvester K. (October 1966). "Computing Visual Comfort Ratings For a Specific Interior Lighting Installation" (PDF). Illuminating Engineering: 634–642.