Frame Materials
Frames are usually constructed from special plastics, stainless steel, titanium and other high-tech materials. Each material varies in terms of weight, flexibility, durability and cost. In addition, rimless frames are also widely available and minimize the cosmetic presence of eyeglasses.
Hinges
In addition to the traditional hinges on eyeglass frames, many frames have spring hinges. This feature is particularly important for children and active adults. Spring hinges are more likely to flex with impact and then return to the original shape. Finally, due to the flexibility of some materials, certain frames are designed without hinges, eliminating the opportunity for lost screws and enhancing the durability of the frame.
Nose pieces
Virtually all metal and metal alloy frames rest on the nose using ‘floating’ nose pads, while plastic frames often rest directly on the nose. When nose pads are used, a smaller area of the eyeglasses is in contact with the nose, which may increase comfort. In addition, nose pads are adjustable for a perfect fit.