M22 Reading Check

Of the following, which bend incoming light rays to focus an image on the retina?

I. Cornea

II. Iris

III. Lens

• I only

• II only

• III only

• I and III only

• I, II, III

Answer explanation

The Cornea and Lens are both curved, which bend light.

On its way to the cones and rods of the eye (in order), light passes through the...

• cornea, lens, iris, pupil

• lens, iris, cornea

• cornea, pupil, lens

• iris, retina, pupil

• retina, lens, iris, fovea

If a person is not able to recognize certain colors, it is likely that the _____ in her or his eyes are not functioning properly.

• rods

• cones

• lens

• iris

• fovea

Which of the following is true about rods and cones?

• There are more cones in the retina than rods.

• Rods are photoreceptors, while cones are not.

• Rods are sensitive to lower levels of light than cones.

• Rods are similar to color film and cones are similar to black and white film.

• Cones can detect shadow better than rods.

The Young-Helmholtz Trichromatic Theory explains how humans can perceive the color yellow by activating the red and green cones in our retina. How is this possible, when yellow is a primary color?

How does the Opponent Process Theory allow humans to perceive afterimages?

Why is parallel processing a vital ability of our brains to perceive visual stimulus?