Far / Near Bifocal Semi Finished Lenses , 1.56 Round Top AR Coating Lens Blanks

For Far And Near Bifocal 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

II. Semi finished lens:

1. Semi-finished lenses need to have high qualified rate in power accurancy, stability and cosmetics quality.

2. High optical features, good tinting effects and hard-coating/AR coating results, realizing the maximum production capacity are also available for a good semi-finished lens.

3. Semi finished lenses can reprocessing to RX production, and as semi-finished lenses, not just superficial quality, they are more focus on the internal quality, such as precise and stable parameters, especially for the popular freeform lens.

4. Freeform lab requests for high quality of semi-finished lenses in precise and stable base curves/radiusg/thickness. Unqualified semi-finished lenses will lead to much waste in capacity, labor, clicking charge, delivery postpone, the consequence of which will be more than the
semi-finished lens cost.

III. Round top-28 optical lenses:

1. As the name suggests these lenses are designed to help with vision at 2 different distances. Round top lenses are usually made with the top part of the lens having the long distance prescription and the bottom part having the close work prescription. Bifocals can be made with the reading portion in a number of different shapes.

2. Round top-28 are two prescriptions combined into a single lens.

Round top-28 were originated by Benjamin Franklin in the 18th century when he cut the halves of two spectacle lenses and fitted them into one frame.

Round top-28 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.

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 pictures:

V. Packing:

VI. Shipping:

VII. Purchase chase:

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.