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Optical Plastic Lens SEMI-FINISHED LENS

1.56 Photochromic Progressive (12mm) Lens(Brown/Gray)

Material : 1.55 Index Resin (Ne=1.549, Abbe value=43, Specific gravity=1.14)
Add Power : +1.00 to +3.50 in 0.25D steps.
Corridor Length : 12mm

CONVEX SURFACE Concave
Curve
C.T
(mm)
E.T
(mm)
Dia
(mm)
Nominal
Curve
True
Curve
Sag
(sagitta:40mm)
Sag
(sagitta:50mm)
Radius Radius
1.549  
1.50 1.45   0.53 0.82 378.571 83.00 7.9 13.8 75
3.50 3.52   1.28 2.00 155.882 8.6 11.8
5.75 5.90   2.14 3.37 92.982 9.3  8.5
7.75 8.03   2.92 4.62 68.387 10.4 6.9
Center Thickness:0.5mm Edge Thickness:0.5mm Diameter Ranges:0.5mm

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 0.35 0.44 0.53 0.61 0.70 0.79 0.88 0.96 1.05 1.14 1.23

Prescription Range:
Nominal Base Curve Recommended Diopter in Base Cylinder
1.50 -13.50 to -4.75 0-6.00
3.50 -4.50 to +1.00 0-6.00
5.75 +1.25 to +4.50 0-6.00
7.75 +4.75 to +7.50 0-6.00