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Optical Plastic Lens SEMI-FINISHED LENS

CR-39 Progressive (17mm) Lens

Meterial : CR-39 Index Resin (Ne=1.499, Abbe=58, Density=1.32)
Add Power : +1.00 to +3.50 in 0.25D steps.
Corridor Length : 17mm

CONVEX SURFACE Concave
Curve
C.T
(mm)
E.T
(mm)
Dia
(mm)
Nominal
Curve
Actual
Curve
Sag
(sagitta:40mm)
Sag
(sagitta:50mm)
Radius Radius
4.50 4.04 1.61 2.52 123.53 83.00 9.8 13.2 75
6.50 6.01 2.40 3.78  83.03 10.7 11.0

Add Prism(Down):
ADD 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50
Prism 0.66 0.83 0.99 1.16 1.32 1.49 1.65 1.82 1.98 2.15 2.31

Prescription Range:
Nominal Base Curve Recommended Diopter in Base Cylinder
4.50 -4.00 to +2.00 0-6.00
6.50 +2.25 to +4.50 0-6.00