In what fundamental way do humans (and many other animals) utilize parallax for the measurement of distance?
A) The eyes focus back and forth continuously, and the brain interprets the focusing in terms of distance to the object viewed.
B) The eye can measure the time taken for light to travel from an object, and the brain interprets this information in terms of distance to the object viewed.
C) Humans are always moving their heads slightly from side to side, and the brain compares the angles from each of these positions to obtain the distance to the object viewed.
D) Human eyes are mounted horizontally about 10 cm apart, and the brain interprets the relative look angles of their eyes in terms of distance to the object viewed.

Question

Quizplus · Accepted Answer

The human brain uses the difference in viewpoints between our two horizontally separated eyes to estimate distances, a process known as binocular vision. This is a form of parallax, where the relative positions or directions of objects appear to differ when viewed from different positions, in this case, through each eye.

In What Fundamental Way Do Humans (And Many Other Animals)