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While the use of glass as a vision aid has been around since AD, the first pair of wearable glass aids dates back to about . These devices of convex-shaped glass surrounded by crude frames proved helpful in magnifying letters for the aged, and a new technology was born. The very term we use to this day, &#;eyeglasses,&#; derives from a simple description of the invention.

Glass Eyeglass Lenses: Where to Buy Them

We&#;ve made a lot of progress in the industry in the last seven centuries, including the development of plastic and polycarbonate lenses, and glass lenses now account for less than 3% of the eyewear market. The main reason for this startling transition is that plastic lenses are much lighter than their glass counterparts. Glass lenses are also more prone to breakage during everyday use.

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Despite this precipitous drop in popularly, glass hasn&#;t completely disappeared from the eyeglass industry, and the ages-old material continues to earn its keep. Glass allows for a higher index than plastic, so certain high-index prescriptions are not available in plastic form. Glass lenses feature far better scratch resistance than plastic lenses, and in terms of optics and clarity, glass cannot be beat.

Before deciding that plastic or polycarbonate is the only way to go, take a quick look at the various advantages and disadvantages of glass lenses.

Advantages

• Superior optical quality.
• Excellent scratch resistance, so much so that no scratch-resistant coating is required.
• Available in a higher index than plastic.
• Anti-reflective coatings
• Is often less expensive than comparable plastics or polycarbonates.
• Cleaner, less noticeable edge when used for bifocals or trifocals.
• Naturally more resistant to chemicals.
• Changes very little over time and will not yellow over the course of its lifespan.

Disadvantages

• The Weight. Glass is at least twice as heavy as a comparable plastic or polycarbonate lens.
• Less shatter- or chip-resistant than other material.
• Requires a thick coat of tint and not available in all the color varieties of plastic.
• Does not provide full UV protection without an additional coating.

For more information, please visit Optical Glass Lens.