65m/m Minus Front Base Single Vision (Extra Thick)

Semi-Finished Material: CR-39*

Edge Thickness: Approx. 21 m/m

Base Curve: -2.75, -4.50, -6.25, -8.25 -10.25

 

 

 

 

 

Material: CR-39* Plastic                                                                                                                     Specific Gravity: 1.32

Index of Refraction: 1.498                                                                                                                        Minus Front Base

Abbe Value: 58                                                                                                                                    65m/m Single Vision

                                                                                                                                                             Round 22m/m Bi-focal
                                                                                                                                                             Round 25m/m Bi-focal
                                                                                                                                                             Round 28m/m Bi-focal


                                        MINUS FRONT BASE

                        Single Vision, Rd. 22, Rd. 25, Rd. 28m/m
                                             EXTRA THICK

Lens         Actual       Nominal    Actual         Back           Sag                                                       Seg                 Seg

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

S.V.           65m/m         -2.75         -2.87        2.25            -1.722        17.2              22.0            S.V.                 S.V.

S.V.           65m/m         -4.50         -4.75        2.25            -2.890        15.6              22.0            S.V.                 S.V.

S.V.           65m/m         -6.25         -6.50        2.25            -3.829        13.4              22.0            S.V.                 S.V.

S.V.           65m/m         -8.25         -8.62        2.25            -5.511        11.6              22.0            S.V.                 S.V.

S.V.           65m/m       -10.25       -10.62        2.25           -7.042         11.8              24.0            S.V.                 S.V.

Bif.            65m/m         -3.00         -3.12        2.25            -1.831        17.0              22.0            0.0                  4.0

Bif.            65m/m         -6.25         -6.50        2.25            -3.829        13.4              22.0            0.0                  4.0

Bif.            65m/m         -8.25         -8.62        2.25            -5.511        12.0              22.0            0.0                  4.0