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Round Top Bifocal lens can automatically adjust the color with the change of the ambient light, generally in the outdoor strong light will become dark, to protect the eyes from ultraviolet and other harmful light damage; It will revert to a transparent or lighter color indoors or in low light environments to ensure clear vision .
This lens usually has dual optical function, seeing far and seeing near, suitable for people who need to correct farsightedness and presbyopia at the same time.
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02Gray: can absorb infrared and 98% of the ultraviolet, any color spectrum can be balanced absorption, watching the scene will only become dark but no obvious color difference, show the real natural feeling, belongs to the neutral color system, suitable for all people.
Brown: can absorb 100% of the ultraviolet, filter a lot of blue light, can improve visual contrast and clarity, in the case of serious air pollution or fog wearing effect is better, but also can block the smooth bright surface of the reflected light, is the ideal choice for drivers.
Other colour: Other colors are selected according to customer preference.
Index | 1.523 |
Material | photochromic |
Diameter | 70/28mm |
Power Range | SPH: -6.00~ +6.00 |
| ADD: 0~ +3.00 | |
Abbe Value | 37.8 |
Coating | HC/HMC/SHMC |
Design | Round Top |
Photo color | Grey/Brown |
The difference between round top bifocals and flat-top bifocals in the method of determining the machining reference line and the apex of the sub-lens, as well as the suitable eye distance. The difference between the invisible bifocal and the other two is its appearance, the invisible bifocal fuses the small lens in the large lens, and there is no obvious boundary between the size of the lens, which does not affect the appearance. However, this design will also lead to the inevitable phenomenon of image jump and image defect.
If you have any questions or suggestions about our prescription lenses, please contact us, we will reply as soon as possible.
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