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Optical Plastic Lens SEMI-FINISHED LENS

CR-39 Progressive(14mm) 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=14mm

CONVEX SURFACE
Concave
Curve
C.T
(mm)
E.T
(mm)
Dia
(mm)
Nominal
Curve
Actual
Curve
Sag
(Sagitta :40mm)
Sag
(Sagitta :50mm)
Radius
Radius
2.50
2.68
1.07
1.67
185.95
126.50
10.5
12.5
75
4.50
4.04
1.61
2.52
123.53
83.00
9.8
13.2
6.50
6.01
2.40
3.78
83.03
10.7
11.0
8.00
7.34
2.94
4.65
68.00
12.4
10.0

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
2.50 -10.00 to -4.25 0-6.00
4.50 -4.00 to +2.00 0-6.00
6.50 +2.25 to +4.50 0-6.00
8.00 +4.75 to +7.00 0-6.00