Vision

The thick, tough, white outer covering of the eyeball is called the __________________.

• sclera

• lens

• pupil

• cornea

___________________ is a clear fluid in the front part of the eye, that helps the cornea keep its rounded shape.

• cornea

• aqueous humor

• vitreous humor

• retina

The tough, clear covering over the iris and pupil that helps protect the eye is the __________________.

• retina

• lens

• sclera

• cornea

The ______________ is a muscle that controls how much light enters the eye.

• iris

• pupil

• cornea

• blind spot

______________________ is the thick, clear jelly that helps give the eyeball its shape.

• aqueous humor

• vitreous humor

• blind spot

• optic nerve

The layer of light-sensitive cells at the back of the eye that detects images focused by the cornea and the lens is called the ___________________.

• blind spot

• sclera

• retina

• optic nerve

The ________________ is the dark circle in the center of your iris that lets light into the inner eye.

• retina

• cornea

• iris

• pupil

The bundle of fibers that carry information from the retina to the brain is called the ____________________.

• optic nerve

• blind spot

• vitreous humor

• aqueous humor

A clear, flexible structure that makes an image on the eye's retina. The _______________ is flexible so that it can change shape, focusing on objects that are close up and objects that are far away.

• lens

• cornea

• pupil

• retina

Identify the part of the eye colored red in this diagram.

• cornea

• pupil

• iris

• sclera