Question

What is the cause of stereoscopic vision in humans?
A. The retraction power of the eye is high
B. Well-developed retina
C. The high developed cerebral cortex
D. Presence of the biconvex lens

Answer 1

Hint: The images formed by both the human eyes are slightly different and they are made as one true picture by our brain. This phenomenon is known as stereoscopic vision in humans. It helps humans in developing the ability to perceive true depth.

Complete answer: The human brain processes the images in such a way that we can see around any obstacle without having to move physically all the time. This is done by taking and forming different images and then mixing and matching them to obtain one final picture. Even after the difference in both the images, the final picture has highly improved three-dimensional perspectives. This is done by the cerebral cortex. In the case of humans, the cerebral cortex is highly developed. It has cortical nerve cells that receive the impulse from both the retinas and then form one single image based on it. This is done by selecting the common parts of the retinal images that are the pictures of the same point on an object. For the process of stereopsis, the nerve cells assess the small displacements from the actual and exact symmetrical image that gives the binocular vision. Thus, based on the above information we can conclude that the cause of stereoscopic vision in humans is the high-developed cerebral cortex.
Hence, the correct answer is option (C).

Note: Stereoscopic vision is the kind of vision that allows humans to judge distance. For all the organisms that possess a stereoscopic type of vision, every eye sees almost similar images. But these images are not exactly similar as they are a slightly different image from the other. This difference in which each eye sees a slightly different image from the other one is referred to as retinal disparity or the binocular disparity.