Path of Light in the Eye

Which part of the eye controls the amount of light entering the eye?

• cornea

• iris

• retina

• pupil

What is the opening in the center of the iris called?

• pupil

• hole

• centerpiece

• aperture

Which part of the eye focuses light onto the retina?

• iris

• cornea

• sclera

• lens

Which part of the eye contains light-sensitive cells that send signals to the brain?

• retina

• pupil

• iris

• cornea

Which part of the eye carries visual information from the retina to the brain?

• cornea

• iris

• pupil

• optic nerve

Which of these pictures shows an eye in BRIGHT LIGHT? (Brighter light than the other eyes displayed.)

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The pupil appears as a ________ in the center of the iris.

• blue triangle

• red square

• yellow star

• black circle

The lens of the eye changes its ________ to focus on objects at different distances.

• color

• size

• position

• shape

What eye part reacts with the fastest moving muscles when an eye rapidly changes from dim light to BRIGHT light?

• lens

• iris

• pupil

• eye lids

The optic nerve carries visual information from the retina to the ________.

• brain

• heart

• stomach

• lungs