What do the numbers on the frame mean?
Frames are identified by manufacturer and frame name or model number. Most frames also come in several sizes, much like shoes. The first number (i.e. 52) is the horizontal diameter of each lens in millimeters. The second number (i.e. 18) is the distance between the lenses in millimeters. This measurement is often referred to as the “bridge size”. The third number (i.e. 135) is the length of the temples or earpieces in millimeters. Most frames also come in several colors. Some manufacturers use a description, such as antique gold, some use numbers. All of this information can be found on the frame. Names and colors are usually on the temples, sizes are usually on the bridge.
