Hi, friends, have you ever noticed a piece of thing whenever looking through a binocular? Here we place each eye in front of one of the eyepieces of the binoculars. We see a single image. our eyes or eyeballs work the in the same way as that of the binoculars, well it is due to binocular (2-eyed) vision.The word Binocular comes from the Latin word bini, means ”two,” and the Greek word oculus, means ”eye.” So, the term binocular signifies two eyeballs focusing on one visual image. Shortly, we can describe it as When we perceive signals from the two eyeballs. They are superimposed in our brain and processed into a single picture within a seconds to get a 3D image.
We have our eyeballs, a few inches apart, which means a lot in understanding human vision. The separation of our eyes helps us to make different in distance, dimension, and depth. With this binocular vision, somewhat the views through the two eyes are nearly identical, rather it creates two slightly different images in the two eyeballs due to the eyes due to the difference in positions of the 2 eyes in our brain.
These differences can be referred to as binocular disparity, which provides a major means to calculate depth perception. These are two aspects of stereopsis, it is the phenomenon to represent three-dimensional appearance. When we see through one eye, there is a shifting of the image occurs, it is due to retinal disparity (the separation between objects as seen by the left eye and the right eye). That is why the distance between the two eyes on an adult is almost always 6.5 cm.
All primates, have binocular vision, but there is the difference in eyes positioning. For example, Some prey animals like rabbits, buffaloes, and antelopes have their two eyes positioned on opposite sides of their heads, which helps them to increase their field of view. Some birds have a 360-degree field of view, Some predator animals, have their two eyes positioned on the front of their heads, thereby allowing a reduction in field of view in favor of stereopsis. Some animals like fruit bats and a number of primates have forward-facing eyes.
Benefits of Binocular vision:-
Is binocular vision better than Monocular vision(a single eye focusing on one image)? Well, it is not easy to answer, but we can say some advantages in case of binocular vision like a larger field of view, precise depth perceptions, eye dominance etc. It enhances visual acuity, contrast sensitivity, visual motor skills etc.