It is a dark round opening at the center of the iris.

• iris

• optic nerve

• cornea

• pupil

It sends messages of what we see to the brain.

• iris

• optic nerve

• cornea

• pupil

It is the colored part of the eye.

• iris

• optic nerve

• cornea

• pupil

It is a transparent material in front of the eye through which light passes.

• iris

• optic nerve

• cornea

• pupil

The iris and pupil work together to control the amount of light entering our eyes.

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• 

This is the part of the eye where an upside-down image is formed.

• lens

• cornea

• retina

• optic nerve

This part of the eye changes light into signals or messages which travel through the optic nerve.

• lens

• cornea

• retina

• optic nerve

This part of the eye controls the size of the pupil.

• lens

• iris

• retina

• cornea

The _________ allows light to enter the eye.

• optic nerve

• iris

• retina

• pupil

The _____________ changes its shape to focus light onto the retina.

• optic nerve

• iris

• lens

• pupil