Question

Which of the following is not an advantage of having two eyes?

• A. It gives a wider field of view.
• B. The ability to detect faint objects is enhanced with two detectors instead of one.
• C. It gives the ability to interpret the closeness of an object.
• D. It gives the eye higher protection from dust and pollution.

Answer 1

The correct option is D It gives the eye higher protection from dust and pollution.

There are several advantages of having two eyes instead of one.
(i) It gives a wider field view because human being has a horizontal field view of about ${150}^o$ with one eye and of about ${180}^o$ with two eyes.
(ii) The ability to detect faint objects is enhanced with two detectors instead of one.
(iii) With one eye, the world looks flat, i.e., two-dimensional-only. With two eyes, the view is three-dimensional.
As our two eyes are separated by a few centimeters, each eye observes a slightly different image. Our brain combines the two views into one and we get to know how close or far away the things observed are.

Thus, option $D$.