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    Lightweight frames weigh 15 grams or lighter without the lenses.

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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 our downloadable PD ruler.

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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    Why Do People Need Bifocal Lenses?

    Bifocals help people who are both nearsighted and farsighted see clearly. Bifocal glasses have two different corrective lenses to accommodate this specific vision problem. In some cases, wearing bifocal eyeglasses can also improve vision of those diagnosed with astigmatism or other refractive issues.

    Signs You May Need a Bifocal Prescription

    One of the main signs your eyes are changing and require bifocal correction is if you notice you see things up close more clearly, when you take off the glasses you are currently wearing. Looking through a pair of prescription bifocal lenses with a special lens insert at the bottom of each lens will allow you to read or see what is written on a computer screen without taking off your old glasses.

    If you can read something better while wearing your current glasses and holding the book or pill bottle at arm's length, you probably need bifocal glasses.

    Recurring headaches, neck strain and upper shoulder pain may indicate your eyes have changed and need a different prescription. Unconsciously squinting or holding your head a certain way for long periods will eventually cause muscle discomfort in your face, neck and shoulder areas.

    Bifocal Glasses Improve Astigmatism and Presbyopian

    Even if you are not nearsighted or farsighted, bifocal lenses can reduce blurriness due to astigmatism, a vision disorder caused by having a misshapen eye lens or elongated cornea. Astigmatism also creates issues with glare in sunlight or partial sunlight that may interfere with your ability to see and drive at night.

    Bifocals are also prescribed to people with presbyopia, a condition common to those over 40. Aging naturally causes a reduction in the eye's ability to quickly focus on up-close objects. Presbyopia is not a disorder or disease, nor is it similar to farsightedness. Instead, presbyopia is attributed to decreased flexibility in the eye's lens due to aging.

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