Abstract

<p>A résumé is presented of the results obtained in an extensive research into the many ways in which glare affects visibility.</p><p>Visibility was studied chiefly by the method of least perceptible contrasts of brightnesses. Results are presented showing the influence of adaptation and of form and size of test-object upon contrast sensitivity.</p><p>The results of the investigation show that the least perceptible brightness-difference between an object and its background increases directly with the illumination at the eye from the dazzle-source; varies approximately inversely with the square of the angle which the glaresource makes with the line of vision; and is practically independent of the brightness, size, type, distance, etc. of the dazzle-source.</p><p>Considerable study has been given to the variations of the pupil under steady, fluctuating, and glaring lights and of their influence upon vision. Results of the investigations upon irradiation, after-images, blinding-glare and light-shocks are also presented.</p>

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