Eyepieces are an important part of many optical instruments, such as binoculars, microscopes, and telescopes. They are composed of two or more LENSES that help to magnify the image seen by the user. The term 'EYEPIECE' can also refer to oculars (7 letters), monocles (8 letters), and LENSES (6 letters). Oculars are small, usually round LENSES that are placed at the end of a tube, while monocles are single LENSES that are held in place by a frame. LENSES are curved pieces of glass that are used to focus light. All three of these terms are related to eyepieces and are used to magnify images.