71m/m Low Placement Rd. 22 m/m Bi-focals

Semi-Finished:

Material: CR-39*

Base Curves: 2.00, 4.25, 6.25, 8.25, 10.25

Additions:

.50 thru 10.00 in .25 steps (ex. 1.25, 1.50, 1.75, 2.00)

Higher additions available upon request

71 m/m (10.25 Base) in .50 steps only

71 m/m Extra Thick also available

Material: CR-39* Plastic Specific Gravity: 1.32

Index of Refraction: 1.498 Low Placement Rd. 22m/m Bi-focal
Abbe Value: 58

Note:*

Lens Actual Nominal Actual Back Sag Seg Seg

Style Size Curve Curve Curve 50m/m C.T. E.T. Inset Drop

Rd.-22 71m/m 2.00 2.00 2.25 1.191 11.2 11.5 0.0 12.5

Rd.-22 71m/m 4.25 4.25 6.25 2.573 9.0 10.4 0.0 12.5

Rd.-22 71m/m 6.25 6.25 6.25 3.864 8.2 11.5 0.0 12.5

Rd.-22 71m/m 8.25 8.25 6.25 5.240 10.8 11.5 0.0 12.5

Rd.-22 71m/m 10.25 10.25 6.25 ** ** ** ** **

Note: *Over 10.00 Diopter addition adds THICKNESS and changes ALL BACK CURVES to -2.25.

Note: **Information Not Available At Press Time.