Directional Sensitivity of the Rods and Cones**The author is greatly indebted to Dr. W. S. Stiles for discussion and personal information on the subject of this chapter.
1962; Elsevier BV; Linguagem: Inglês
10.1016/b978-1-4832-3089-4.50012-1
Autores Tópico(s)Ocular and Laser Science Research
ResumoThis chapter presents the directional sensitivity of the rods and cones. The luminous efficiency of a light ray entering the pupil of the human eye and terminating on the retinal image of the light source is dependent upon the point in the pupil through which the ray has passed. This directional sensitivity of the retina, known as the Stiles–Crawford effect, was discovered by Stiles and Crawford in 1933. It was subsequently established that it is essentially a property of the cones. A given flux of light entering through the outer zones of the pupil contributes less to the apparent brightness than an equal flux entering near the center. Stiles and Crawford compared photometrically the subjective brightness of surfaces sending to the eye two narrow beams of light, one of which entered the eye through a small area near the centre of the pupil, the other through another small area at different distances from the pupil center.
Referência(s)