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Ophthalmic Lenses

Mineral Glass LensesResin LensesPMMA Lenses

Mineral Glass 1.523 & 1.700 Ophthalmic Lenses
Quality Standard:
1. The tolerance limits:
A) SPHERICAL POWERS   + AND -
                                                                tolerance limits          
                                                        sphero               astigmatic
from 0.00 to 6.00                             +/-0.03
from 6.25 to 12.00                           +/-0.06                +/-0.06
over             12.00                           +/-0.09
B) TORIC POWERS   + AND -
                                                     tolerance limits of cylinder powers
                                                                  from 0.25 to 2.00
from 0.00 to 6.00                                             +/-0.03
from 6.25 to 12.00                                           +/-0.06
over             12.00                                           +/-0.09
2. The prism tolerance
0.00 -- +/-0.50                                    0.15^
+/-0.75 -- +/-2.00                            < = 3.0mm
+/-2.25 -- +/-6.00                            < = 2.0mm
+/-6.25 -- +/-20.00                          < = 1.5mm
3. Cosmetic issues:
                    center (Diameter:30mm)                edge
point No    < Diam.0.10mm    two
line No width < 0.015mm, length < 10mm   two
         Range
          I.        n=1.523
          0.00 -- +/-6.00
          0.00 -- +/-6.00/+/-0.25 -- +/-2.00
Color: White or Pink
Diameter: 60mm, 65mm or 70mm
II.       n=1.700
-3.00 -- -20.00
-2.00 -- -14.00/-0.25 -- -2.00
-2.00 -- -8.00/-0.25 -- -4.00
Color: White or Pink
Diameter: 65mm or 70mm
* We also have other mineral glass products such as lenses index 1.600, photochrometic lenses, sunglasses lenses and high qualified blanks.
 
Resin Lenses (Cr-39 lenses)
Range: 0.00 -- +/-6.00
           0.00 -- +/-6.00/+/-0.25 -- +/-2.00
PMMA Lenses

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