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    Lightweight frames weigh 15 grams or lighter without the lenses.

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How to Read an Eyeglass Prescription
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Play How to Read an Eyeglass Prescription
SPH (Sphere)

Spherical error, or overall power of lens is the basic part of your prescription. A (+) means you have trouble seeing near, and a (-) means you have trouble seeing things faraway.

CYL (Cylinder) & Axis

A cylinder value indicates astigmatisms or perpetually blurry vision. Axis—measured between 1 and 180°— tell us the orientation of the astigmatism

ADD (Addition)

This number is sometimes written NV for near vision and is used for multifocal lenses and readers

PD (Pupillary Distance)

It's just what sounds like—the distance in millimeters (mm) between your pupils. An average PD measurement is 63 mm, but varies by person. If it's not on the prescription, you can measure it yourself by:
• printing the downloadable PD ruler.
• watching our tutorial video.

PRISM

We can process prism prescriptions to correct eye orientation

Vertical Prism is used to help correct vertical eye misalignments and is prescribed in opposite directions for both eyes

Horizontal Prism is used to help correct lateral eye misalignments and is always prescribed in the same direction for both eyes

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    Features of Single Lenses

    A benefit of wearing single vision glasses is the variety of options you can choose from for your lenses. When selecting your frames and lenses, it’s important to consider what will best suit your day-to-day wear, like the material of the lenses, the designs, and the coatings.

    Three popular eyeglass lens materials include plastic, polycarbonate, and high-index plastic. Plastic lenses are desirable for many eyeglasses because it is lightweight, has excellent optics, and is inexpensive.

    Polycarbonate lenses are lightweight and the most durable of the three lens materials. They’re ideal for children or for those who play sports because they are very difficult to shatter.

    Finally, high-index plastic lenses are also thin and lightweight and block 100 percent of UV rays.

    Once you’ve established which lens material is the most beneficial for your frames, you can decide on a lens coating so you’ve got the most comfortable, durable, and stylish eyeglasses possible. Common eyeglass coatings include anti-scratch, anti-reflective, UV-blocking treatment, and photochromic treatment.

    All lightweight lens materials are softer than traditional glass and are more susceptible to scratches. Most scratch-resistant coatings will make your lenses as tough as glass. Anti-reflective coatings are ideal because they make your lenses practically invisible, reduce the number of reflections you see through your lenses, and eliminate contrast and clarity issues you can have at night.

    UV-blocking and photochromic treatment lenses deal with light and the sun. A UV-blocking coating needs to be applied if you choose a material like plastic. Polycarbonate and high-index plastic lenses have UV protection built in. You’ll need that extra boost to protect your eyes against UV damage.

    Photochromic treatment coatings allow your lenses to darken in response to light or UV detection and are clear when indoors.

    Discover Your Perfect New Eyeglasses

    To find your ideal new single vision eyeglasses, explore our full catalog of men’s, women’s, and children’s frames. At EyeBuyDirect, we guarantee you’ll love your new frames. That’s why we offer all of our customers a 14-day fit and style guarantee and a 12-month guarantee on all of our eyeglasses and prescription sunglasses.

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