Photochromic Eyeglasses changes from light to dark

Photochromic Eyeglasses changes from light to dark depending on the amount of ultraviolet light they are exposed to.We at www.bestpriceglasses.com offers Photochromic eyeglasses from Corning International:

Thirty-five years ago, a company called Corning Medical Optics invented type of lens that changes color under direct UV exposure, they call it PhotoGray and PhotoBrown . As their names suggest, the lenses are available in either gray or brown colors that are light enough to wear indoors and darken to a sunglass shade when exposed to ultraviolet light.

The active ingredient that causes the lenses to transform is called silver halide and is mixed evenly throughout the lens. This means the whole lens will change when exposed to light. It also means that if a particularly strong prescription is made, the strongest, thickest part of the lens will be darker than the thinner parts. Also, if there is a large difference in prescription between the two eyes, the lens with the stronger prescription will be darker than the weaker one.

Since then, Corning has updated its offerings many times. What we carry is Corning's newest photochromics are SunSensors mid-index gray and brown plastic lenses. A bit lighter in weight and thinner than regular plastic, these lenses have photochromic molecules mixed throughout the material, rather than just in the top layer. However, unlike their glass counterparts, SunSensors change within 60 seconds to a uniform color density throughout the lenses, regardless of the prescription or lens thickness, according to the company.

Our full line of photochromic eyeglasses include single vision and progressive. We also carry photochromic lens by Transition, which is a big thinner than the Traditional Photochromic lens, but at high price.

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