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Medium index 1.56
Ophthalmic lenses with an medium index of 1.56 are a common choice if you have moderate prescriptions and want thinner, lighter lenses compared to lower index lenses.
Parameters
| Article | Medium index, single view |
| Refractive index | 1.56 |
| Abbe index | 38 |
| Transmittance | 90% |
| Specific Gravity | 1.28 |
| UV protection | UV385 & UV400 & UV++ |
| Design | Spherical, Aspherical, Bifocal Aspherical |
| Diameter | 55/60/65/70/75 mm |
| Coating | UC, HC, Tintable HC, HMC, HMC+EMI, Super hydrophobic, Lux-vision, Blue Cut |
| Coating Dye | Green, blue, yellow-green, magenta, gold, etc. |
| Availability | Finished, semi-finished |
Power Range
*Powers beyond the range mentioned above are also available through prescription production (RX).
Flat and Thin
⌀55/60
A special flat and thin design to provide the presbyopic lens with very light weight and smooth edges. Available in diameters of 55 mm and 60 mm
- Lighter than a standard 1499 CR39 lens
- Higher UV blocking rate, protects eyes from damage caused by UV rays.
- Better clarity with 90% transmittance.
Parameters
| Power Index | Curved Base | Thickness (mm) |
| +0.25～+0.50 | 200 | 1.6 |
| +0.75～+1.00 | 200 | 1.4 |
| +1.25～+2.00 | 200 | 1.2 |
| +2.25～+3.00 | 75 | 1.2 |
| +3.25～+10.00 | 75 |
Blade edge design |
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