Difference between revisions of Eyeballs
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→Focusing Power: General fixes, typos fixed: For example → For example,
(give rough estimate of focusing power.) |
Viceroy Sam (talk | contribs) m (→Focusing Power: General fixes, typos fixed: For example → For example,) |
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==Focusing Power== | ==Focusing Power== | ||
As a back-of-the-envelope calculation for the focusing power of an [[emmetropic eye]], we might estimate the [[axial length]] as around 2.5cm. For [[distance vision]] (parallel incident light) that number is simply the [[focal length]] of the eye at rest, giving 40 [[Diopters]]. If we take the near point as about 25cm, that requires an additional 4 dpt of focusing power from the lens. (For example using the thin lens equation <math>\frac{1}{x} + \frac{1}{y} = \frac{1}{f}</math>.) | As a back-of-the-envelope calculation for the focusing power of an [[emmetropic eye]], we might estimate the [[axial length]] as around 2.5cm. For [[distance vision]] (parallel incident light) that number is simply the [[focal length]] of the eye at rest, giving 40 [[Diopters]]. If we take the near point as about 25cm, that requires an additional 4 dpt of focusing power from the lens. (For example, using the thin lens equation <math>\frac{1}{x} + \frac{1}{y} = \frac{1}{f}</math>.) | ||
== Axial Length == | == Axial Length == | ||