a monocular is a compact refracting telescope used to magnify images of distant objects.

amblyopia anisometropia application astigmatism binoculars binoculer cataract compact compactness corneal difficulties distant erect eyes eyesight hiking ideally impairment important lenses like low magnify monitoring monocular monoculars needed objects occur optical perception preferred prism refracting relay sights strabismus suited survey telescope telescopic three-dimensional typically ulceration unilateral used variation visual weight