When John drives his car at night, he finds that he can barely see traffic and street signs if he looks directly at them. He can increase his visual sensitivity by looking at the signs:
A) out of the side of his eye, because doing so focuses the image on the blind spot
B) out of the side of his eye (using more rods) instead of focusing directly on them (using more cones)
C) and squinting, which focuses the available light more precisely
D) out of the side of his eye (using more cones) instead of focusing directly on them (using more rods)

Question

Quizplus · Accepted Answer

Looking out of the side of his eye allows John to use more rods, which are more sensitive to light and better suited for low light conditions. Focusing directly on the signs would require using more cones, which are less sensitive to light and better suited for daytime vision. Squinting would reduce the amount of light entering the eye and could actually decrease visual sensitivity.

When John Drives His Car at Night, He Finds That