Eye Structures & Functions

What is the dark opening in the middle of the iris?

• lens

• pupil

• optic nerve

• cornea

This eye disease is marked an increased pressure within the eye.

• glaucoma

• cataracts

• color blindness

• astigmatism

Cataracts is a cloudiness of the lens which may develop due to the following reasons:

• aging

• trauma

• metabolic disorders

• heredity

Tags

NGSS.MS-LS1-5

About 8% of males and 0.4% of females have a difficult time telling the difference between _____ & _____ because their cones are either missing or not working properly.

• black and yellow

• white and black

• blue and green

• red and green

This structure is right in front of the optic nerve

doesn’t produce impulses to the brain.

• optic disc

• choroid

• blind spot

• aqueous humor

This structure protects the eye and causes light rays to bend as they enter the eye.

• lens

• pupil

• iris

• cornea

This is the colored part of the eye that controls the amount of light that enters.

• iris

• vitreous humor

• ciliary muscles

• lens

This structure produces images that are sent to the brain and contains rods & cones.

• pupil

• iris

• lens

• retina

This structure focuses light rays and changes shape to see sharp images close or far.

• iris

• lens

• cornea

• pupil

True or False: 10 % of animals don’t have eyes

• True

• False