The hinges on a pair of glasses may seem like a small detail, but they play a crucial role in the functionality and durability of eyewear. These tiny mechanisms allow the temples (arms) of the glasses to fold inward, making them more portable and easier to store when not in use. Hinges also contribute to the overall comfort and fit of the glasses, as they determine how smoothly the temples can open and close. Most glasses hinges fall under three main types. Learn what makes them different from one another, and the benefits of each.