monoculär

Monoculær (monocular) is an adjective used to describe something relating to or involving a single eye. The term derives from Latin oculus (eye) and the prefix mono- meaning one.

In human vision, monocular refers to sight through one eye. Most people rely on binocular vision for depth perception, but depth information can also be derived with monocular cues when only one eye is used or when one eye is impaired. Monocular cues include perspective, shading, relative size, occlusion, and motion parallax, all of which help judge distance and shape without stereoscopic vision.

Monocular devices are handheld optical instruments designed for viewing with one eye. A monocular telescope or monocular is a compact, single-lens instrument used to observe distant objects. Monocular night-vision devices, rangefinders, and certain medical imaging tools also operate through a single optical channel. These devices are valued for portability, ease of use, and, in some settings, cost efficiency.

In medicine and clinical contexts, monocular can describe conditions or tests involving one eye. For example, monocular diplopia refers to double vision present when only one eye is open, which typically points to a problem in the eye itself rather than the brain’s processing of both eyes. By contrast, binocular diplopia arises from misalignment or coordination issues between the two eyes.

Overall, monoculær denotes single-eye perspective or equipment, distinguishing it from binocular approaches that involve both eyes.