Hot Keywords:
- All
- Product Name
- Product Keyword
- Product Model
- Product Summary
- Product Description
- Multi Field Search
 |
| Quantity: | |
|---|---|
Product Show
Technical Data
1.499 S/F ROUND 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 | 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 |
Bifocals in General
 | RT-28 in bifocals
|
Bifocal lens can be called a multi purpose lens. It has 2 different fields of vision in one visible lens. The larger of the lens usually has the prescription necessary for you to see for distance. However, this can also be your prescription for computer use or intermediate range, as you would normally be looking straight when you view through this particular part of the lens. The lower part, also called the window, typically has your reading prescription. Since you generally look down to read, this is the logical place to put this range of vision assistance.
Advantages of round-top bifocals 1. The wearers can see the near things by the round shape and see the distance things by the rest of the lenses. 2. The wearers don't need change two different visions glasses when they both reading book and watching TV. 3. The wearers can keep the same posture when they look both the near thing or far thing. |  |
Contact Us
