65 m/m or 71 m/m Reverse-Slab Rd. 25m/m Bi-focal

 

Semi-Finished

Material: CR-39*

                                                                             

Base Curves: 2.00, 4.25, 6.25, 8.25, 10.25, 12.00 *(12.00 not available in 71m/m)

 

Segment Placement: 4 down & 4 in - Rights or Lefts

 

Additions: 1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00, 3.25, 3.50, 3.75, 4.00, 4.25, 4.75, 5.00, 5.25, 5.50, 5.75, 6.00, 6.25, 6.50, 6.75, 7.00, 7.25, 7.50, 7.75, 8.00, 8.25, 8.50, 8.75, 9.00, 9.25, 9.50, 9.75,10.00

 

(Higher additions available upon request)

 

 1-20 Diopter Steps

 (Higher diopter steps may be available upon request)

 

Material CR-39*                                                                                  Specific Gravity: 1.32

Index of Refraction: 1.498                                                         Round 25m/m Reverse Slab

Abbe Value: 58                                                                               65m/m & 71m/m Blanks

 

Note:* Note:** Note:***

 

 


Lens         Actual        Nominal      Actual            Back           Sag                                                Seg        Seg

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

 


Rd-25       65m/m               2.00          2.00              2.25        1.191         ***           ***              4.0        4.0

Rd-25       65m/m               4.25          4.25              6.25        2.573         ***           ***              4.0        4.0

Rd-25       65m/m               6.25          6.25              6.25        3.864         ***           ***              4.0        4.0

Rd-25       65m/m               8.25          8.25              6.25        5.240         ***           ***              4.0        4.0

Rd-25       65m/m            10.25        10.25              6.25        6.742         ***           ***              4.0        4.0

Rd-25       65m/m            12.00        12.00              6.25        8.207         ***           ***              4.0        4.0

 

Rd-25       71 m/m              2.00          2.00              2.25        1.191         ***           ***              4.0        4.0

Rd-25       71 m/m              4.25          4.25              6.25        2.573         ***           ***              4.0        4.0

Rd-25       71 m/m              6.25          6.25              6.25        3.864         ***           ***              4.0        4.0

Rd-25       71 m/m              8.25          8.25              6.25        5.240         ***           ***              4.0        4.0

Rd-25       71 m/m           10.25        10.25              6.25

 

Note: * Over 5 Degrees of Prism Slab adds THICKNESS and Changes ALL 65m/m BACK CURVES to -2.75

 

Note: ** Over 5 Degrees of Prism Slab adds THICKNESS and Changes ALL 71m/m BACK CURVES to -2.25

 

Note: *** Center Thickness and Edge Thickness CHANGES with DEGREE of PRISM SLAB.