The larger the view angle, the the larger the image, and the the more you can distinguish the details of the object. Moving closer to an object increases the angle of view, but is limited by the eye's ability to focus. Use a uveća staklo so it is close to the eye and place the object within its focal point to form an uspravno virtual image. The role of the uveća staklo je to uvećanje the gledanje kut. Povijesno, it is said that the application of povećalo naočale was predloženo by a biskup of Engleska, Grosstheist, in the 13th century.
More than a tisuća godina ago, prozirni kristali or prozirni dragi kameni bili su tlo u "lense" to uvećano slike. Također poznato as a convex lens.