Jiangsu Aogang Optical Glasses Co., Ltd.
Bring the clear world back to you
Add to Cart
1.56 Round-top AR Coating Semi Finished Lens Blanks In Multi Purpose Lens
I. Technical Data:
| 1.56 Semi Finished Round Top Bifocal Lens Blanks | |
| Material: 1.56 Index NK55 Resin (Ne=1.549, Abbe=38, Specific Gravity=1.28) Segment Placement: 5mm down -5mm in Add Power: +1.00 to +3.50 in 0.25D steps Segment Size: 28mm |  |
| Diameter(mm) | Nominal Curve | Front Radius | T.C | Back Radius | BACK T.C | CT/ET | Frong sag Ring 50mm | RX Range Recommended |
| ɸ70 | 200B | 260.199 | 2.04 | 94.93 | 5.58 | 10.0/14.0 | 1.20 | -4.25Dto-8.00D |
| ɸ70 | 400B | 127.62 | 4.15 | 94.93 | 5.58 | 6.0/8.0 | 2.47 | +2.00Dto-4.00 |
| ɸ70 | 600B | 87.18 | 6.08 | 161.04 | 3.29 | 9.0/6.0 | 3.66 | 0.00Dto+4.00D |
| ɸ70 | 800B | 66.49 | 7.97 | 161.04 | 3.29 | 13.0/6.0 | 4.88 | -4.25Dto+6.00D |
II. Round top bifocal lens:
Some time after age 40, you will begin to notice the symptoms of presbyopia, including that feeling that your arms "aren't long enough" to hold a newspaper or magazine at a position where you can read it clearly.
If you already wear prescription eyeglasses, this generally means you will need to begin wearing bifocal lenses, such as round top bifocals to continue to see clearly at all distances.
Round-top bifocal eyeglass lenses contain two or more lens powers to help you see objects at all distances after you lose the ability to naturally change the focus of your eyes due to age (presbyopia).
Though RT bifocal lenses usually are prescribed for adults over age 40 to compensate for presbyopia, in some cases bifocals are prescribed for children and young adults who have eye teaming or focusing problems that cause eye strain when reading. In these cases, the bottom portion of the bifocal lens reduces the amount of focusing effort required to see near objects clearly.
III. Coating Choice:
| ---AR Coating/HMC
To protect the lens effectively from reflection, enhance functional and charity of your vision
---Hard Coating(HC)
To make the uncoated lens are easily subjected and exposed to scraeches
---Base lens/Uncoated lens
Inner surface of the lens adopt imported element material --- NK55, has excellent performance . | |
IV. Production Process:
V. Packing:
| Envelops | 1) standard white envelop |
| 2) color envelop with customer design weight: 157g size: 9*9*9cm | |
| 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 |
VI. 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 |