What Are Standard Eyeglass Frames?

Eyeglasses are prescribed to correct a defect in vision. Frames hold the eyeglasses in place. Today, eyeglass frames are as much a fashion accessory as watches and jewelry. Eyeglass frame styles are often popularized by characters on films or television. For example, in the 1950s, square-rimmed spectacles sported by fictional "Superman" character Clark Kent were very popular among boys and men. Today, many children likewise want rounded frames such as those sported by "Harry Potter".

Evolution

• Prior to frames, eyeglasses were simply held in front of the eye. Next, the eyeglasses were positioned in a half frame that could be held in front of the face with one hand. Then came the nose frame, which consisted of a pair of eyeglasses fitted over frame held on the bridge of the nose. In the early 18th century nose glasses were modified to include temple clamps, keeping them firmly in place. By the 1880s, the temple clamps were extended and curved over the ears to produce the spectacle frames we know today.

Materials

• Eyeglass frames are made of plastic or metal. A plastic like zylonite (cellulose acetate) is used for its light weight and the flexible color options. Nylon based plastics may also be used because they are hypoallergenic. Metals are used in frames for their corrosion-resistant properties. Metals such as titanium, beryllium, aluminum and stainless steel are commonly used. Each metal has unique features. For instance, beryllium has high tarnish resistance, making it a good choice for wearers who spend lot of time around salt water. Flexon is a titanium-based alloy, which has the unique property of coming back into shape even after twisting, bending and crushing. You can create a unique style statement with your frame, by opting for frames made from wood or leather.

Measurement

• The boxing system of frame measurement is the official standard of the industry. Having standardized frame measurements help optical personnel ensure a perfect frame fit for customers. The frame size is represented by three numbers, say, "A", "B" and "C" on the frame temple. "A" is the length of the lens. "B" refers to bridge length that is related to the fit of the frame on your nose. "C" refers to the temple length--the part going over your ears. Frame measurements vary depending on the size and shape of the frame and also the customer's face shape. So there is no set measurement for one frame that would apply to different customers. Each frame has to be fitted individually.

Types

• Eyeglass frames may be classified as "classic" and "business" frames. "Classic" frames are traditional frames, usually round or oval in shape, available in black, brown and grey. "Business" frames have a touch of elegance and sophistication and include such varieties as metal frames and rimless frames. You may also opt for innovative frames that are trendy, with creative design elements to make an interesting fashion statement.