1、The advantages of the 1.499 index. ① The highest impact resistance among other index lenses ②The most easily tinted than other index lenses, such as 1.56, 1.61, 1.67, 1.74 and 1.59 pc. ③The highest transmittance as compared with middle index lenses and high index lenses. ④The highest ABBE value(57) providing the most comfortable visual experience than other index lenses. ⑤The most reliable and consistent lens product physically and optically.2、Advantages of round-top bifocals ①The wearers can see the near things by the round shape and see the distance things by the rest of the lenses. ②The wearers don't need change two different visions glasses when they both reading book and watching TV. ③The wearers can keep the same posture when they look both the near thing or far thing.
3. 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 |
| 1.499 round-top bifocal optical lens | |
| Model: | 1.499 optical lens |
| Place of Origin: | Jiangsu, China |
| Brand: | SETO |
| Lenses Material: | Resin |
| Function | Round-top bifocal |
| Lenses Color | Clear |
| Refractive Index: | 1.499 |
| Diameter: | 65/28MM |
| Abbe Value: | 58 |
| Specific Gravity: | 1.32 |
| Transmittance: | >97% |
| Coating Choice: | HC/HMC/SHMC |
| Coating color | Green |
| Power Range: | Sph: -2.00~+3.00 Add: +1.00~+3.00 |