Understanding Human Vision

What percentage of all the sensory receptors in your body are in the eyes?

• 50%

• 70%

• 60%

• 80%

What is the main function of the cornea?

• To change the size of the pupil

• To supply blood to the eye

• To convert light energy into nerve impulses

• To let light into the eye

What is the diameter of an adult eyeball?

• 2.5 centimeters

• 4.5 centimeters

• 1.5 centimeters

• 3.5 centimeters

What is the function of the iris?

• To keep the eyeball in shape

• To convert light energy into nerve impulses

• To supply blood to the eye

• To protect the eye from too much light

What do rods in the retina detect?

• Fine detail and color

• Grayscale of black and white

• Only red color

• Only green color

What happens to your cones when you stare at a brightly colored image for too long?

• They change color

• They stop responding

• They increase in number

• They become more sensitive

What is the function of the optic nerve?

• To supply blood to the eye

• To change the size of the pupil

• To carry impulses to the brain

• To protect the eye from too much light

What is the main role of the retina?

• To keep the eyeball in shape

• To change the size of the pupil

• To supply blood to the eye

• To convert light energy into electrical signals

What do cones in the retina detect?

• Fine detail and color

• Only red color

• Grayscale of black and white

• Only green color

What is the condition called when an eyeball pops out?

• Globe luxation

• Optic neuritis

• Retinal detachment

• Corneal abrasion