Question

Explain clearly why, a person who has lost the sight of one eye is at a disadvantage compared with the normal person who has two good eyes.

Answer 1

Human vision properly works by the simultaneous works of the two eyes.The two eye system gives a better object location tracking in a three dimensional space.

That's why a person who has one defected eye ,faces many problems to properly locate an object in the three dimensional space and often gets confused about the exact physical location of any nearby object.

On the other hand a person who has normal two eyes ,can easily locate and visualise an object in the three dimensional space.