Understanding the Human Eye

What is the primary function of the pupil in the human eye?

• To provide color to the eye

• To focus light onto the retina

• To allow light to enter the eye

• To protect the eye from dust

How does the iris react when exposed to bright light?

• It makes the pupil larger

• It makes the pupil smaller

• It changes color

• It does not react

What is the role of the cornea in the eye?

• To detect colors

• To control and focus light entering the eye

• To change the color of the eye

• To produce tears

Which part of the eye is responsible for focusing light onto the retina?

• Pupil

• Lens

• Cornea

• Iris

What type of photoreceptor is responsible for color vision?

• Rods

• Retina

• Optic nerve

• Cones

Why do objects appear in shades of gray at night?

• Because cones are inactive

• Because rods are inactive

• Because the iris is closed

• Because the pupil is too small

How many color hues can the human eye detect?

• 10 million

• 20 million

• 1 million

• 5 million

What is the function of the optic nerve?

• To change the size of the pupil

• To send visual information to the brain

• To produce tears

• To focus light onto the retina

How does the brain process the image received from the retina?

• It flips the image upside down

• It turns the image right side up

• It enlarges the image

• It changes the image color

Approximately how many pieces of information can the eyes process each hour?

• 10,000

• 50,000

• 20,000

• 36,000