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| Lens Materials - Middle Index ( R.I 1.56) |
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| Clear, colorless, lighter, thinner, better resistance to abrasion, chemicals, heat and radiation, excellent mechanical and optical properties, less chromatic aberration than polycarbonate, hard coated by default. |
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| Density (g/cm3) |
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1.216 |
| Hardness
Barcol (15 sec value) |
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38-40 |
| Refractive index (nd 20) |
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1.556b |
| Abbe number |
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37.7 |
| Transmittance % (400-700nm) |
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92.93 |
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