Thank you Ian, I did make the assumption that the lens had a peripheral curve that allowed the lens to come to a edge thickness of equal value to the lenses center thickness.
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Thank you Ian, I did make the assumption that the lens had a peripheral curve that allowed the lens to come to a edge thickness of equal value to the lenses center thickness.
Fantastic information, I too would often have the lab tip the edge with a 12.50 or 18.00 depending on a flat or steep lens. I keep my outside curves to 1.5mm of the total overall diameter of the...
Close I can see how you came up with that as a hypothesis.
S1 refers to the sag of the front curve which must be calculated in this instance and s2 refers to the base curve or back curve radius'...
The base curve radius is 43.25 and the power needed is -1.50, this can be used to find the front curve power:
front curve + back curve = power
front curve + (-43.25) = (-1.50)
front curve =...