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2015-05-29 19:44:06
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http://www.clarkvision.com/imagedetail/eye-resolution.html
What is the focal length of the eye? I did a google search and found many "answers" ranging from 17mm to 50mm (50 is totally absurd). For the correct answer, is Reference: Light, Color and Vision, Hunt et al., Chapman and Hall, Ltd, London, 1968, page 49 for "standard European adult":
Object focal length of the eye = 16.7 mm
Image focal length of the eye = 22.3 mm
The object focal length is for rays coming OUT OF THE EYE. But for an image on the retina, the image focal length is what one wants. E.g. see: http://galileo.phys.virginia.edu/classes/531.cas8m.fall04/l11.pdf.
So this explains the commonly cited ~17mm focal length, but the correct value is ~22 mm focal length
사람 눈의 초점거리는 바깥쪽으로 17mm, 안쪽으로 22mm정도이며 50mm는 틀린 답이라 합니다