Direct measurement of acuity target images as formed by excised steer and cat eyes indicates the blur of the retinal image to be much greater than theoretically expected. For example, a 3-sec black line produces a retinal image of maximum contrast 0.5%. The author believes the discrepancy between theory and measurement to be due to the neglect, in theoretical calculations, of entoptic stray light. The measured characteristics of the image are discussed in relation to existing data on entoptic stray light, glare, and acuity.
© 1959 Optical Society of AmericaFull Article | PDF Article
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