Retinal Image & Visual Angle

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4 Terms

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Rule 1

If you keep the OBJECT SIZE the same and double the VIEWING DISTANCE then the visual angle is HALVED.

2
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Rule 2

If you keep the VIEWING DISTANCE the same and double the OBJECT size then the visual angle is DOUBLED.

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What is the exception to Rule 1 and 2?

The rules are good approximations for small angles, but not angles greater than ~5 degrees

4
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How much of the retina is subtended by 1 degree of visual angle?

~0.3mm(0.288mm exactly)