1）Where is blue light? Nowadays, we spend more time using a wide variety of digital devices to work, learn and be entertained. Recent digital screens are often equipped with powerful light source such as LED. These digital screens emit intense blue light and can cause eye strain after long exposure. 2）Protect your eyes from blue light 1. Avoid damages to macular caused by blue light. 2. Protect macular the acutest part of vision from blue light and segregate its damages. 3. Make sight more clear and increase the contrasting of red and green. Also reducing the forming of halo and influence of eyesight by blue light will ensure traffic safety. 4. Reduce the transmission of blue light and photophobia stimulus can relieve eye fatigue, the effect of which is greatly different from the common tinting lenses in the markets.3) The advantages of the 1.67 Index: 1. Lighter weight and thinner thickness, up to 50% thinner and 35% lighter than other lenses 2. In the plus range, aspherical lens is up to 20% lighter and thinner than spherical lens 3. Aspheric surface design for outstanding visual quality 4. Flatter front curvature than non-aspheric or non-atoric lenses 5. Eyes are less magnified than with traditional lenses 6. High resistance to breakage (very suitable for sports and children’s spectacles) 7. Full protection against UV rays 8. Available with blue cut and photochromic lens
4) What is the difference between HC, HMC and SHC？
| Hard coating | AR coating/Hard multi coating | Super hydrophobic coating |
| makes the uncoated lens hard and increases the abrasion resistance | increases the transmittance of the lens and reduces surface reflections | makes the lens waterproof, antistatic, anti slip and oil resistance |
| 1.67 semi-finished blue block single vision optical lens | |
| Model: | 1.67 optical lens |
| Place of Origin: | Jiangsu, China |
| Brand: | SETO |
| Lenses Material: | Resin |
| Bending | 50B/200B/400B/600B/800B |
| Function | blue block & semi-finished |
| Lenses Color | Clear |
| Refractive Index: | 1.67 |
| Diameter: | 70/75 |
| Abbe Value: | 32 |
| Specific Gravity: | 1.35 |
| Transmittance: | >97% |
| Coating Choice: | UC/HC/HMC |
| Coating color | Green |