You know, I misread you! I used theta/90 to give me a percentage multiplier for the cyl power:
(I'm in Green)
I like yours better for lower arcs off the axis, mine's a
little less forgiving closer to the 90.
(Sorry my graph chopped off the arc values)
For test taking--yours is a fast easy slam dunk. Using mine for guaging unwanted prism is seemingly a far weaker case--(and I should say I erred on the side of caution when using this shortcut for quick math--close calls got reviewed by the doc.)
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On a tangental subject (pun intended,) care to share more on oblique fuzziness?
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