Glasses

Glasses

Industry: Eyewear

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Glasses

Clip-on

Eyewear; Glasses

A small device with sunglass lenses that hooks onto your prescription eyeglasses. Clip-ons are handy, convenient and easy to use.

20/20 vision

Eyewear; Glasses

The clarity or sharpness of vision measured at a distance of 20 feet. See also What is 20/20 Vision?

Axis

Eyewear; Glasses

Indicates the placement in degrees of the astigmatic lens.

Backside coating

Eyewear; Glasses

Polycarbonate lenses and high-index plastic lenses are thinner and have flatter prescription curves and so require a hard backside coating to protect them from scratching.

Ballistic

Eyewear; Glasses

Involves high velocity projectiles. Ballistic eyewear is shatter-resistant, rugged and exceeds ANSI Z87.1 safety and military MIL-STD-662 standards.

Base curve

Eyewear; Glasses

The curve on the back surface of the contact lens.

Bifocal

Eyewear; Glasses

Corrective eyewear lenses containing regions with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hypermetropia, ...