Glare and the Four Fundamental Factors in Vision

This paper reopens the subject of "glare." Experimental data, consisting of measurements of visibility, are presented, showing the effect of a range of glare conditions upon a wide variety of test-objects. These confirm earlier work upon the subject, and in addition show that the result of the measurement depends in a noteworthy way upon the test-object selected. Suggestions as to the improvement of present-day lighting-for-work are made, with a view to the reduction of glare to a negligible minimum.