Jiangsu Aogang Optical Glasses Co., Ltd.
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Middle-Index 1.56 Flat-Top Uncoated Prescription Bifocal Lenses For Presbyopes
I. Specifications:
| Refractive Index | Monomer | Place Of Origin | Brand |
| 1.56 | NK55, imported from Japan | China | Aogang |
| Abbe Value | Specific Gravity | Transmission | Coating |
| 42 | 1.21 | 94% | uncoating |
| Diameter | Flat Top Segment | Power Range | |
| 70mm | 28mm | SPH:0.00~+3.00,0.00~-3.00,CYL:+1.00~+3.50 | |
II. Flat Top Bifocals:
As their name suggests, bifocal eyeglass lenses have two lens powers — one for distance and one for near.
The lower half of a bifocal lens contains the near segment for reading and other close-up tasks. The rest of the lens is usually a distance correction, but sometimes has no correction at all in it, if you have good distance vision.
The Franklin bifocal design remained in style for more than a century. Then in the early 1900s, the invention of fused bifocals offered thinner and more attractive lenses.
In a fused bifocal, a small lens segment for near vision is attached (fused) to a full distance lens.
 | The most popular fused bifocal today has a D-shaped near segment rotated 90 degrees so that the flat part of the "D" is facing up. For this reason, D-seg bifocals also are called "flat-top" (FT) or "straight-top" (ST) bifocals.
Flat-top bifocals are further described by the width of the near segment, measured in millimeters (mm). The most popular FT bifocal is the FT-28, a flattop bifocal with a near seg that is 28 mm wide. |
FT-28 offers a wide field of forward vision and allows the user to see objects at close range without changing spectacles. This lens gives the wearer a wide range of long-distance vision and, at the same time, allows viewing of objects at close range such as meters, navigation screens and expressway tickets. This type can also be used for sports such as golf.
III. Technical Data:
IV. Packing&Shipping:
| Envelops | 1) standard white envelop |
| 2) color envelop with customer design | |
| Outer box | standard export paper carton 38cm*48cm*35cm ( 0.064 CBMS ) |
| Include around 500 pairs of finished lenses, 21kgs | |
| Include around 100 pairs of semi finished lenses, 15kgs |
| Shipping | Samples | By Fedex, DHL, UPS, TNT etc. |
| Delivery time: within 3 days | ||
| Batch goods | By air, sea, express | |
| Delivery time: 10-30 days, depend on your quantity | ||
| Carrier | We can choose for you or offer us your cooperative company | |
| Payment terms | 30% T/T in advance, the balance before shippment | |
V. Why Choose Us:
1. About Us
Jiangsu Aogang Optical Glasses Co.,Ltd is a professional optical lens manufacturer for more than 10 years in China. All lenses are exported to European countries, Japan, Korea, North and South America, Middle East, Southeast Asia and Africa market. We guarantee the quality to all buyers all over the world, and got a high reputation about quality from buyers in the past 8 years exporting time. Our producing process is in vacuum dust-free shop, like prepare material, mixed material and take out .Four times quality checking during production process. In Aogang Optical, you can find high quanlity lenses with the most competitive prices.
2. Samples
Just send us your requirements, then we will send samples accordingly. We only need 1~2 days to finish the sample production. Samples are free, but according to our company rule, our customers need to assume the shipping cost.