i need thickness formula to find out thickness acording to size for plus power lenses
i need thickness formula to find out thickness acording to size for plus power lenses
I hope this helps.
Thickness in mm = (Radius squared X power)/2000 (index of refraction-1)
Once computed, add the thickness to the predetermined edge thickness for plus lenses and the center thickness for minus lenses.
- the radius is (decentration doubled + the ED)/2
- the power is located in the strongest meridian of the lens
Ophthalmic Optician
Society to Advance Opticianry
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