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Technical Data
| 1.56 Semi Finished Photochromic FT-28 Lens(Brown/Gray) | ||
Material: 1.56 Index Resin(Ne=1.56, Abbe=42, Specific Gravity=1.15) Segment Placement=5mm down~5mm in Add Power: +1.00 to +3.50 in 0.25D steps Segment Size=28mm |  | |
| CONVEX SURFACE | CONCAVE SURFACE | |||||||
| Mominal Curve | True Curve | Sag (sagitta: 40mm) | Radius | Radius | CT(mm) | ET(mm) | Dia(mm) | |
| 1.549 | ||||||||
| 2.00 | 70 | |||||||
| 4.00 | 4.17 | 1.50 | 131.74 | 132.50 | 8.0 | 8.0 | ||
| 6.00 | 6.35 | 2.30 | 86.45 | 88.80 | 8.0 | 7.0 | ||
| 8.00 | ||||||||
Product Features
1) How Do Bifocal Lenses Work?
Bifocal lenses are perfect for people suffering from presbyopia- a condition in which a person experiences blurred or distorted near vision while reading a book. To correct this problem of distant and near vision, bifocal lenses are used. They feature two distinct areas of vision correction, differentiated by a line across the lenses. The top area of the lens is used for seeing distant objects while the bottom part corrects the near-vision. |  |
2) Benefits of Photochromic Lenses
They are highly adjustable to varying lighting conditions in indoor and outdoor environments
Protect your eyes from harmful UVA and UVB rays of the sun
They eliminate the use of separate prescription glasses as they are suitable for most frames and prescriptions
Photochromic lenses are versatile as they can be enhanced using additional treatments like anti-glare coating and scratch-resistance coating
Can be used by both adults and children
Since they are distortion free, they can be worn in rains
Ideal for everyday use
3) Why Choose Photochromic Flat Top Lenses?
----Our Flat Top 28 Bifocal Photochromic lenses are manufactured using the same high quality NK55 material(imported from Japan) as our standard lenses, with ultraviolet filter and scratch resistant coating. Flat Top 28 Bifocals provide you with clear, sharp distance and reading vision.
----FT-28 Photochromic Lenses contain light-sensitive molecules that darken and lighten according to the intensity of ultraviolet light. Recent advances in Photochromic technology ensure that they perform consistently across a wide range of temperatures and climates.
----The greater the intensity of the UV rays, the darker the lens becomes. The moment the UV rays are no longer present, the lens begins to fade back to almost clear. Photochromic Lenses do not change while driving in a car. All Photochromic lenses come with 100% UV protection.
Coating Choice
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.
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