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Optical Plastic Lens SEMI-FINISHED LENS

1.56 Photochromic Progressive (14mm) Lens (Brown / Gray)

Meterial : 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 : 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 2.87 1.04 1.63 191.33 76.40 10.0 15.2 70
4.50 4.36 1.58 2.48 125.87 10.0 13.5
6.50 6.61 2.40 3.78  83.03 10.0 10.5
8.00 8.07 2.94 4.65  68.00 12.0  9.7

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 -12.00 to -4.75 0-6.00
4.50 -4.50 to +2.25 0-6.00
6.50 +2.50 to +5.00 0-6.00
8.00 +5.25 to +7.50 0-6.00