Question

With both eyes open, a person’s field of view is about ________.
1. 90°
2. 150°
3. 180°
4. 360°

Answer 1

Correct Answer - Option 3 : 180°

The correct answer is 180°.

• The human eye is like a camera. Its lens system forms an image on a light-sensitive screen called the retina.
• The eyeball is approximately spherical in shape with a diameter of about 2.3 cm.
• The eye lens forms an inverted real image of the object on the retina.
• The light-sensitive cells get activated upon illumination and generate electrical signals. These signals are sent to the brain via the optic nerves. The brain interprets these signals, and finally, processes the information so that we perceive objects as they are.

• When the light is very bright, the iris contracts the pupil to allow less light to enter
• However, in dim light, the iris expands the pupil to allow more light to enter
• Thus, the pupil opens completely through the relaxation of the iris.
• A human being has a horizontal field of view of about 150° with one eye and of about 180° with two eyes. Hence option 3 is correct.