Monocular vision

Monocular vision is vision in which both eyes are used separately in animals and monocular vision in human species is vision when only one eye is used. By using the eyes in this way the field of view is increased, while depth perception is limited. The eyes of an animal with monocular vision are positioned on opposite sides of the animal's head, giving it the ability to see two objects at once. The word monocular comes from the Greek root, "mono" for single, and the Latin root, "oculus" for eye.
Related medical conditions.
Monocular vision impairment refers to having no vision in one eye with adequate vision in the other.
Monopsia is a medical condition in humans who cannot perceive three-dimensionally even though their two eyes are medically normal, healthy, and spaced apart in a normal way. Vision that perceives three-dimensional depth requires more than parallax. In addition, the resolution of the two disparate images, though highly similar, must be simultaneous, subconscious, and complete. (After-images and "phantom" images are symptoms of incomplete visual resolution, even though the eyes themselves exhibit remarkable acuity.) A feature article in "The New Yorker" magazine published in early 2006 dealt with one individual in particular, who, learning to cope with her disability, eventually learned how to see three-dimensional depth in her daily life. Medical tests are available for determining monoptic conditions in humans.
Monocular cues.
Monocular cues provide depth information when viewing a scene with one eye.
Recent advances in computational machine learning now allow monocular depth for an entire scene to be algorithmically estimated from a single digital image by implicitly using one or more of these cues
Balance.
Vision has been known to play an important role in balance and postural control in humans, along with proprioception and vestibular function. Monocular vision affects how the brain perceives its surroundings by decreasing the available visual field, impairing peripheral vision on one side of the body, and compromising depth perception, all three of which are major contributors to the role of vision in balance. Studies comparing monocular vision to binocular (two eyes) vision in cataract patients (pre and post surgery), glaucoma patients (compared with healthy age matched controls), and in healthy adults and children (in both binocular and monocular conditions) have all shown to negatively impact balance and postural control than when both eyes are available. Each of the studied populations still displayed better balance when having only one eye compared to having both eyes closed.