Difference between revisions of Presbyopia

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===Caveats===
===Caveats===


I’m not entirely sure how cylinder affects this measurement, so you’ll have to refine the technique if you have cylinder.
This technique might need to be refined for cylinder, if spherical equivalent is not used.


The cornea and lens actually have more power because the total power has to focus the image on your retina, but they cancel out in the subtraction step, so it’s easier to ignore them.
The cornea and lens actually have more power because the total power has to focus the image on your retina, but they cancel out in the subtraction step, so it’s easier to ignore them.
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