Does anyone have the equation for figuring out the dynamic plus power of a lens when you move the vertex distance away from the eye??? Lets say you move +.50 lens out to 93cm or 930mm. What is the perceived visual power in diopters at that distance
Does anyone have the equation for figuring out the dynamic plus power of a lens when you move the vertex distance away from the eye??? Lets say you move +.50 lens out to 93cm or 930mm. What is the perceived visual power in diopters at that distance
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+.50 / (1 + -.930 x +.50) = +.935
De = DL / 1 + dDL
De = new effective power
DL = orginal lens power
d = change in vertex distance in meters
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