Monoculars & Golf Scopes A monocular is a modified refracting optical
device used to magnify the images of distant objects by passing light through a
series of lenses and prisms; the use of prisms results in a lightweight
construction. Volume and weight are less than half those of binoculars, making
it easy to carry. Monoculars are often used by visually impaired people to see
distant objects that would normally be indiscernible. For example, they are
often used to read text on a chalkboard or projection screen. Besides their use
by the visually impaired, they are also used in hunting, survival and espionage.
For these specific tasks smaller monoculars are made that fit inside a regular
pocket and they are frequently referred to as "spy scopes".