What is Binocular Single Vision?

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 Definition:

It is a fusion of two foveal images of an object into a unified perception of a single image.  

Development  It is a conditioned reflex that is not present at birth but is acquired during the first six months and is completed during the first few years of life

 

                     The factors necessary for the development of BSV are;

  1. Normal or nearly normal vision in each eye.
  2. The accurate coordination of the two eyes for all directions of the gaze.
  3. The ability of the visual areas in the brain to cause the fusion of two slightly dissimilar images.



Advantages

The advantages of BSV are;

  1. Stereoscopic image; It is a three-dimensional perception i.e. the object is perceived as having height, width, and length.
  2. The field of view becomes larger.
  3. Binocular vision is better than monocular vision.
  4. The blind spot of each eye is overlapped.
Grades of BSV

Grade-I Simultaneous perception is the ability to perceive two images formed on each other.

Grade-II Fusion is a unified perception of two retinal images of an object as a single image, in two dimensions. 

 Grade-III Stereopsis is the unified perception of two retinal images of an object as a single image in three dimensions.




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