71m/m Round 35m/m Bi-focal

Semi-Finished Material: CR-39*

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

Available in 71m/m Blanks only

Additions: .50, .75, 1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00, 3.25, 3.50, 3.75

Higher additions also available upon request

Material CR-39* Plastic Specific Gravity: 1:32

Index of Refraction: 1.498 71m/m Rd. 35m/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-35 71m/m 2.00 2.00 2.25 1.191 11.2 11.5 0.0 4.0

Rd-35 71m/m 4.25 4.25 6.25 2.573 9.0 10.4 0.0 4.0

Rd-35 71m/m 6.25 6.25 6.25 3.864 8.2 7.4 0.0 4.0

Rd-35 71m/m 8.25 8.25 6.25 5.240 10.8 7.4 0.0 4.0

Rd-35 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.