Depth perception is the ability to see in three dimensions: length, width, and depth and to judge how far away the object is located. Depth perception is only possible when we have good binocular vision which means the effective use of both eyes to view the world.
Our eyes view an object from slightly different angles and our brain compares and processes the two sets of information to form a single image. When both eyes see clearly and the brain can process a single image effectively, it is called stereopsis. Stereopsis is not present at birth but develops at 3-6 months of age.
An eye doctor may use one of many tests to check your depth perception. The most common test is called a vectograph and uses polarized 3D glasses. You may be asked to point out which animals, circles or forms are coming out of the page towards you.
