Abstract
Gloss and reflected light on written or printed texts can lead to different types of disturbance in reading or writing. Veiling reflections and reflected glare resulting from excessively high reflected luminances in the field of view can cause impairment of visual performance and visual comfort. Experiments with glossy papers show that the conditions for good visual performance and good subjective ratings are not necessarily correlated. For good visual performance adequate values of contrast and luminance are required. For comfort strong specular reflections should not occur. From the viewpoint of visual comfort, a value, pmax, can be defined, which is the maximum percentage contribution of the offending zone to the overall illuminance at the visual task, if discomfort is to be avoided.
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