GP MATERIALS

SGP I (Designed for gas permeable lenses using thin designs, allowing increased comfort without sacrificing sharp vision or oxygen permeability)

Refractive Index: 1.471
Wetting Angle :30
DK: 19
Specific Gravity : 1.130
Hardness: 84 D

SGP II (Designed for gas permeable lenses, providing an excellent balance between increased oxygen permeability and lens stability. A popular choice for daily-wear lenses, offering a compromise of comfort and oxygen permeability.)

Refractive Index: 1.475
Wetting Angle :27
DK: 44
Specific Gravity : 1.126
Hardness: 82D

SGP III (A newer generation gas permeable material, which offers both the stability of SGP I, and the high oxygen permeability of SGP II, and then adds a fluorine chemical composition for increased deposit resistance.)

Refractive Index: 1.481
Wetting Angle :27
DK: 44
Specific Gravity : 1.126
Hardness: 82D

Colors: blue, brown, clear, green, gray.

Click here for general information on Gas Permeable Materials

PMMA MATERIALS

PMMA (polymethyl mehtacrylate) Sterling provides a wide range of different color PMMA lens blanks. This material offers excellent light transmittance, combined with toughness and stability. PMMA is hydrophobic and has low oxygen permeability.

  • Refractive index 1.490
  • Wetting angle 18
  • DK 00
  • Specific Gravity 1.195
  • Hardness > 90D

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