The eye has several surprising optical properties: although it is an extremely wide angle (almost 180 degrees) system, no vignetting is noticed. This is due to the peripheral image being closer to the principal point, thus producing a smaller and brighter image to compensate for the reduced pupil area. Also, The central image does not have a small image as the image is focussed behind the retina, hyperopia of normal eye. The cone shape tends to defocus any light not absorbed by the visual pigment outside of the fovea. The dark adaptation of the rods and cones is more similar than is given in standard references on the subject. The significance of these properties is discussed in relation to retinal injury levels and flash blindness from laser exposures.
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ILSC '99: Proceedings of the International Laser Safety Conference — Volume 4a
March 8–11, 1999
Orlando, Florida, USA
ISBN:
0-912035-17-4
PROCEEDINGS PAPER
The Optics and Physiology of the Eye in Relation to Laser Injury Available to Purchase
Myron L. Wolbarsht
Myron L. Wolbarsht
Duke University
Box 90086 Durham NC 27708-0086, England
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Published Online:
March 01 1999
Citation
Myron L. Wolbarsht; March 8–11, 1999. "The Optics and Physiology of the Eye in Relation to Laser Injury." Proceedings of the ILSC '99: Proceedings of the International Laser Safety Conference — Volume 4a. ILSC '99: Proceedings of the International Laser Safety Conference — Volume 4a. Orlando, Florida, USA. (pp. pp. 93-100). ASME. https://doi.org/10.2351/1.5056488
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