|CR-39 Semi Finished Progressive(14mm) Lens|
Material: CR-39 Index Resin(Ne=1.499, Abbe=58, Specific Gravity=1.32)
Add Power: +1.00 to +3.50 in 0.25D steps
|CONVEX SURFACE||CONCAVE SURFACE|
|Mominal Curve||Actual Curve|| |
|Nominal Base Curve||Recommended Diopter in Base||Cylinder|
|2.00||-10.00 to -4.25||0~-6.00|
|4.00||-4.00 to +2.00||0~-6.00|
|6.00||+2.25 to +4.50||0~-6.00|
|8.00||+4.75 to +7.00||0~-6.00|
What are progressive lens?
Progressive lenses offer no-line, multi-focal viewing zones for the most convenient vision correction. If you are over 40 and having difficulty with your vision, chances are you are experiencing presbyopia, the common gradual loss of near vision. But there is good news: you have more choices today than ever before. You don't have to carry a separate pair of glasses for reading or wear lined bifocal lenses like your parents did. Now, you can have no line bifocal reading glasses.
|Progressive lenses offer a smooth transition from distance vision through intermediate vision to near vision, and they supply all the in-between corrections as well. This means that instead of having just two different viewing zones (near and distant), like with bifocals, progressive lenses have progressive powers of correction (from bottom to top), easing eye strain and providing he most natural vision correction.|
Advantages of progressive lens:
Natural, clear and balanced vision from far to near
Low astigmatism provides visual comfort and easy adaptation
Larger far zone and comfortable reading zone
The most important benefits of anti-reflective (AR) coating may be the unseen advantage–relief from fatigue and eyestrain caused by glare. AR does have a big cosmetic advantage, but removing the distracting reflections and ghost images that contribute to eyestrain clearly is a bigger benefit. Being more comfortable in anything we do is a benefit, especially when wearing glasses.