A. Is there anything on line that will give the approximate best-form base curve based on lens power?
B. If it could vary by material, that would be quite nice.
The reason: the VSP lab made a pair of -1.00 D poly lenses for a zyl frame with a +4.50 base, but the front keeps flattening and the glasses fall off.
I'm going to try to remake on a steeper curve, and 1.) I don't know if +6.00 is unreasonable, and 2.) I don't know if +4.50 is corrected curve.
Any help on either of these?
I need a reference resource.
B. If it could vary by material, that would be quite nice.
The reason: the VSP lab made a pair of -1.00 D poly lenses for a zyl frame with a +4.50 base, but the front keeps flattening and the glasses fall off.
I'm going to try to remake on a steeper curve, and 1.) I don't know if +6.00 is unreasonable, and 2.) I don't know if +4.50 is corrected curve.
Any help on either of these?
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