Eyeglasses may be used to gain vision correction, UV protection or injury prevention. Modern eyewear products are generally similar in the overall structure, regardless of those slight differences or variations. Most people know that a pair of complete eyeglasses consists of two lenses and a frame. Well, this is absolutely true that the frame aims to hold the lenses in place and the lenses will provide related visual help. These two parts are mutual complementary and form the basic structure of an eyewear. This classification of different roles is reasonable but some details are shielded. A complete pair of eyeglasses involves many more small parts, which will be discussed in the remainder of this writing.
Eyeglasses lenses can not be further divided that they must be complete should they function properly. But the situation of an eyewear frame is quite different. A pair of complete eyeglasses has a couple of frame parts, each of which serves in a specific way. The frame front refers to the front part of a frame that holds the lenses in place and bridges the top of the nose. In other words, this part includes typically two rings and a bridge. To some extent, this is the most important part of the frame because it connects the two separate lenses via the nose bridge. Moreover, the frame front is sometimes further divided into two eye wires and a bridge. An eye wire is the part into which a lens is inserted. And a bridge is the area between the lenses that goes over the nose and supports 90% of the eyewear weight. There are different types of frame bridge, like keyhole bridge, saddle bridge, adjustable bridge, double bridge and even triple bridge.
In addition to the frame front, there are also two end pieces to which the temples are attached. In some cases, these two end pieces are referred as the extensions of the frame front. Another two tiny parts are hinges, which connect the frame front to the temples and allow the temples to swing. This is the key part that links the frame front with the temples. The bridge mentioned above is not the only part that helps hold the frame. The two temples extending over or behind the ears also take a fraction of the frame weight. Complete eyeglasses also have two nose pads and possibly pad arms, top bar or temple tips.