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Math of the Eye
- Morgan Hager
- Feb 29, 2016
- 1 min read
*Corneal radius: r = 337.5/K
*The SRK formula is calculated easily by hand as P = A - 0.9 K - 2.5 L, where P is the IOL power to be used for emmetropia, A is the IOL specific A constant, K is the average corneal refractive power (diopters), and L is the length of the eye (mm). The SRK II formula adjusts the A constant utilized depending on the axial length: increasing the A constant for short eyes and decreasing the A constant for long eyes.
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