SF CR39 1.499 Uncoated Flat Top Bifocal Lenses In Semi Finished Lens Blanks For Far And Near Vision
I. Technical Data:
| 1.499 S/F FLAT TOP BIFOCAL BLANKS |
| MARTERIAL REFRACTIVE INDEX=1.499 TOOLING INDEX=1.530 |
| Diameter(mm) | Nominal
Curve | Front
Radius | T.C | Back
Radius | BACK
T.C | CT/ET | Frong sag
Ring 50mm | RX Range
Recommended |
| ɸ70 | 200B | 234.27 | 2.26 | 94.93 | 5.58 | 10.0/14.0 | 1.34 | -5.25Dto-8.00D |
| ɸ70 | 400B | 127.62 | 4.15 | 94.93 | 5.58 | 10.0/12.0 | 2.47 | +2.00Dto-5.00 |
| 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. Semi finished lens:
| Semi-finished lens is the raw blank used to produce the most individualized RX lens according to thepatient's prescription. Different prescription powers request for different semi-finished lens types or base curves. The semi-finished lenses are produced in a casting process. Here, liquid monomers are first poured into moulds. Various substances are added to the monomers, e.g. initiators and UV absorbers. The initiator triggers a chemical reaction that leads to hardening or "curing" of the lens, while the UV absorber increases the UV absorption of the lenses and prevents yellowing. |  |
III. The classic bifocal product for presbyopes:
Flat top lens are two prescriptions combined into a single lens. Flat top lens are needed because the distance glasses do not suffice to focus sufficiently for near. As age increases, (in India 38-40 years is the presbyopic age) reading glasses are required to read at a comfortable distance. Rather than taking out the distance glasses and putting on near glasses each time, a person who wishes to work at the near point could use the lower segment comfortably.
 | The flat top is also called the style multifocal lens. This design has a segment width that ranges from 25mm to 45mm. The Flat Top is regarded as one of the easiest multifocal lenses to adapt to, hence it is the most commonly used bifocal (FT 28mm is referred to as the standard size). This lens style is also one of the most readily available in almost any medium and including comfort lenses. The Flat Top utilizes the complete width of the segment giving the user a definitive reading and distance transition |
IV. Factory Pictures:
V. Packing&Shipping:
| Envelope | Carton | Lenses Pair | Size | Weight | Lead Time |
| Choice 1 | White Envelope | Stand Export Carton | Finished optical lens: 1 pcs/envelope, 500 pairs/carton | 38*48*35 cm | 21 KG | Depend on the order quantity |
| Choice 2 | Your design with your logo | Semi-finished optical lens: 1 pcs/envelope, 100 pairs/carton | 15 KG |
| Carrier | We can choose for you or you offer us your cooperative company |
| All the numbers provided above are estimated number, the actual number need to be measured according to the order you make. |
| Payment Term | 30% T/T in advance, the balance before shipment |
VI. Our service:
1. Our Customer service will begin to track the product processing every day until you receive the goods and verify the product quality when you finish the payment.
2. Online via SKYPE,Whatsapp;Also through mail, voice phone, message could contact us at any time!
3. Follow up the case, record the entire process. Solution will be provide with 24 hours.
Meanwhile,the problem complaint will be reported to QC department.
QC will find defect from which department ,who is in charge to identify responsibility.
4. Collect and record all the voice from each customer respond , suggestion, requirement.
5. We own the best after-sale service,if any problems happen,our team will do our best to solve for customers.
Product Tags:
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SF CR39 Uncoated Flat Top Bifocal Lenses Blanks Far / Near Vision 1.499 Index Images
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