When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

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Each row of an Rx has three main sections: Sphere (SPH), Cylinder (CYL), and AXIS. The SPH section corrects nearsighted or farsighted vision. The CYL and AXIS sections correct  an astigmatism.

The thickness of the lens is related to the refractive index. The higher the refractive index, the thinner the lens. You can choose the lens that is more suitable for you according to your own habits and preferences.

If you don't know how to choose the Refractive Index,you can refer to these informations,and you can get the most comfortable prescription glasses.

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You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

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The well-known Wratten gelatin filters, an industry standard for many years, are now being replaced by 'Wratten 2' filters. They are manufactured in ...

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This is needed for the manufacturer of the eyeglasses to know where to place the optical center on each lens, so you can see well with the glasses.

202233 — What is Lens Formula and Magnification? · Magnification produced by a lens (m) · m = Height of the image / Height of the object · m = hi / h · m ...

PD stands for Pupillary Distance, which is the measurement from the center of one pupil to the center of the other. Your PD is an important factor and tells you where you look through the lens of your glasses and should be as accurate as possible. For people with strong prescription, this is especially important. You can normally find your PD on your prescription. Generally speaking, the PD numbers for adults stays the same. The average PD range for adults is 57-72 mm and for kids is about 43-58 mm.

If your Sphere (SPH) is ‘+’,you are farsighted,please tell us that after you put on the glasses, do you see further clearly or see near clearly compared with not  wearing glasses.

by E Gentzsch · 2017 · Cited by 1 — Generation of Circularly Polarized Light. A circular polarization state can be generated using linearly polarized light and a quarter ...

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Jun 28, 2016 — Researchers at MIT and elsewhere have found a new way of using mid-infrared lasers to turn regions of molecules in the open air into glowing ...

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The depth of field (DOF) is the distance between the nearest and the farthest objects that are in acceptably sharp focus in an image captured with a camera.

There may also be a fourth section on the Rx , NV-ADD (for Near Vision-Reading ADDition), which could be used to order a pair of bifocal or progressive glasses with a close-up   vision section in the bottom part of the lens.

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A full list of the countries where we ship glasses is available on the Payment Page. For more info you can check out our Shipping Information page

Brand New and High quality, See the difference with Cyxus Polarized Sunglasses.Wear polarized sunglasses to see the test card, you will see the hidden colorful pattern. This is the most convenient and fast way to judge whether the polarized sunglasses are authentic or not. Take it and found the real polarizer for you.

The LUCY Drawing Tool is an improved adaptation of the classic camera lucida. Serving as an art tracing tool for drawing and painting, it functions like an ...

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

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Optelec product groepen · Optelec PowerMag+ Illuminated Pocket Magnifier 6D, 100mm · Optelec PowerMag+ Illuminated Pocket Magnifier 8D, 85mm · Optelec PowerMag+ ...