CR-39 1.499 Anti-glare Prescription Lenses In Progressive Multifocal Lenses
I. Specifications:
| Index | 1.499 | Diameter | 75mm |
| Monomer | CR39 | Abbe Value | 58 |
| Corridor | 14&17mm | Specific Gravity | 1.32 |
| Transmission | 97% | Guarantee | 3~5 years |
| SPH | 0.00~+-3.00 | ADD | +1.00~+3.50 |
II. Progressive/Multifocal Lens:
- Who Use Progressive Lens?
All of a sudden, you might have trouble pushing a thread through the eye of the needle or you may have to hold your newspaper far away from your face so that you can read it. These are the first signs of advanced age vision problems. It is a normal process and no cause for concern. After all, good glasses and progressive lenses are now available to ensure that you can enjoy eagle’s eye vision.
 | It begins somewhere between the age of 40 and 50: The lens and the ring muscle inside your eyes might lose elasticity. The eye is no longer able to automatically adjust and zoom in on different distances, a process enabled by what experts call accommodation. It makes the lens of the eye bend to adjust to the distances. |
However, if this process does not work as nature intended, this causes problems with close-up vision. If the lens maintains a flat shape when looking at objects that are close-by, its refractory force is significantly impaired. Consequently, light beams that penetrate the eye from near-by are bundled behind the retina and deliver a blurred image.
In this situation, progressive lens is a good choice for you.
- The Advantages Of Progressive Lens
1. The additional lens power required for clear vision at different viewing distances is accounted for by the natural position of the eye during the majority of day to day tasks, and can be further adjusted by tilting the head to sight through the appropriate part of the vertical progression.
2. The lens location of the correct addition power for the viewing distance usually only requires small adjustments to head position, because near vision tasks such as reading are usually low in the visual field and distant objects higher in the visual field.
3. Progressive addition lenses avoid the discontinuities (image-jumps) in the visual field created by the majority of bifocal and trifocal lenses and are more cosmetically attractive. Because bifocal and related designs are associated with 'old age', proponents have suggested the lack of segments on the lens surface of a progressive lens appears more 'youthful' because the single vision lenses associated with younger wearers are free of segments or lines on the surface.
4. Progressive lenses can use the optimization principle, which is based on linearization and represents the lens surface using spline functions. The lens’ power progressively increases between the low-power and high-power region of the lens. This specialized lens surface provides an accurate power distribution for both near and distant vision and reduces the number of optical aberrations.
III. Comfortable Vision At More Distances Than Bifocals:
| Bifocal Lens Bifocal lenses have only two powers: one for seeing across the room and the other for seeing up close. Objects in between, like a computer screen or items on a grocery store shelf, often remain indistinct with bifocals. To attempt to see objects at this "intermediate" range clearly, bifocal wearers must bob their heads up and down, alternately looking through the top and then the bottom, to determine which part of the lens works better. Bifocals also put you at greater risk for computer vision syndrome (CVS) when using a computer for extended periods. Bifocal wearers have to sit closer to the screen and tilt their heads back to see through the bottom part of their lenses. This unnatural posture can lead to muscle strain, neck pain and other symptoms of CVS. | | Progressive Lens Progressive lenses more closely mimic the natural vision that you enjoyed before the onset of presbyopia. Instead of providing just two lens powers like bifocals, progressive lenses are true "multifocal" lenses that provide a smooth, seamless progression of many lens powers for clear vision across the room, up close and at all distances in between. With progressive lenses, there's no need to bob your head up and down or adopt uncomfortable postures to see your computer screen or other objects at arm's length.Holding your head in a comfortable position, you can simply look straight ahead to see in the distance, move your eyes slightly downward to view your computer through the intermediate zone and lower your gaze a bit farther to read comfortably up close. |
IV. Technical Data:
V. Packing&Shipping:
| 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 |
| 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 |
| Payment terms | 30% T/T in advance, the balance before shippment |
VI. Our factory:
VII. Purchase Process:
1. If you need the samples, we will check the samples fee and the shipping cost, and we will delivery the samples to you in three days after we receive the payment.
If you do not need the samples, we can send the price list to you.
2. If you are satisfied with our samples or the price list, you can show us your order list.
3. We will do a proforma invoice which show you the total cost including the goods fee, shipping cost, the size of the lenses and some other important information.
4. We will start the order when we receive your despoit, the 30% of the total cost.
5. We need about 15~40 days to produce the order which up to your quantity, and keep update the producing process to you in time.
6. When we finish the producing, we will inform you to pay for the rest of the money. And we will delivery to you asap when we receive the balance.
7. We will offer the tracking number and the documents for you to clearance at customs.
Product Tags:
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CR 39 1.499 Prescription Anti Glare Lenses Multifocal Vision 75mm Diameter Images
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