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Technical Data
| 1.56 Semi Finished Photochromic Progressive(12mm) Lens(Brown/Gray) | ||
Material: 1.56 Index Resin(Ne=1.56, Abbe=38, Specific Gravity=1.20) Add Power: +1.00 to +3.50 in 0.25D steps Corridor Lenghth=12mm |  | |
| CONVEX SURFACE | CONCAVE SURFACE | ||||||||
| Mominal Curve | Actual Curve | Sag (sagitta: 40mm) | Sag (sagitta:50mm) | Radius | Radius | CT(mm) | ET(mm) | Dia(mm) | |
| 1.549 | |||||||||
| 3.00 | 1.45 | 0.53 | 0.82 | 378.571 | 83.00 | 7.9 | 13.8 | 75 | |
| 4.00 | 3.52 | 1.28 | 2.00 | 155.882 | 83.00 | 8.6 | 11.8 | ||
| 5.00 | 5.90 | 2.14 | 3.37 | 92.982 | 83.00 | 9.3 | 8.5 | ||
| 6.00 | 8.03 | 2.92 | 4.62 | 68.387 | 83.00 | 10.4 | 6.9 | ||
Add Prism(Down):
| ADD | 1.00 | 1.25 | 1.50 | 1.75 | 2.00 | 2.25 | 2.50 | 2.75 | 3.00 | 3.25 | 3.50 |
| Prism | 0.35 | 0.44 | 0.53 | 0.61 | 0.70 | 0.79 | 0.88 | 0.96 | 1.05 | 1.14 | 1.23 |
Prescription Range:
| Nominal Base Curve | Recommended Diopter in Base | Cylinder |
| 3.00 | -13.50 to -4.75 | 0~-6.00 |
| 4.00 | -4.50 to +1.00 | 0~-6.00 |
| 5.00 | +1.25 to +4.50 | 0~-6.00 |
| 6.00 | +4.75 to +7.50 | 0~-6.00 |
Product Features
Today’s technologies make our lenses thinner, lighter, stronger, and better able to cope with the wear and tear of daily use, more so than anyone could have dreamt of just a generation ago.These technologies all address individual issues. Need protection from bright sunlight? Use a tint or a transition lens. As the grow older, your eyes can not see good things near or far? Use a progressive lens. If you have these two confuse, photochromic progressive lens is the best choice for you.
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Progressive lens are also called No-Line Bifocals. They actually have three fields of vision – distance, computer, and reading. You can custom your Rx so you can use them for different distances, but that’s usually what people use them for. The progressive lens will progress from one “vision” to the next as you move your eye down through the lens, being that the top is distance and progresses to computer and then reading. |
This style of lens takes some time to get used to, and for sure will one day take over the entire market away from old school bifocals.
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Potochromic lenses are optical lens that darken on exposure to specific types of light of sufficient intensity, most commonly UV radiation. In the absence of activating light the lenses return to their clear state. Photochromic lenses may be made of glass, polycarbonate, or another plastic. They are principally used in eyeglassses that are dark in bright sunlight, but clear in low ambient light conditions. They darken significantly within about a minute of exposure to bright light, and take somewhat longer to clear. A range of clear and dark transmittances are available. |
Why Go For Photochromic Progressive Lenses?
If you choose photochromic progressive lenses
They offer a younger looking appearance
Provide 100% protection from the sun’s UVA and UVB rays
They give you a comfortable and continuous field of vision with reduced distortion
They eliminate the use of reading glasses because they have the power to correct all areas of vision
Eliminate the problem of image jump
Reduce the chances of eyestrain
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