Originally Posted by
ravenclaw
Hi. I'm working on a project, please check my math.
What is overall power if the intent were to make a spherical lens with the ideal back curve for equidistance to eye as it moves.
Back Curve -6 (equidistant for eye as it moves)
Index 1.74
Base Curve (Front Curve) .50 (on box)
Power = (Back Curve + Front Curve) * (.74/.53)
= (-6+.5) ( .74/.53)
= 7.68
{another way to ask my question, when one says the ideal spherical back curve is -6D, is that -6 based on a 1.53 index, and should be adjusted based on the index. If so, I think my math is correct??}
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