Eye Part 1

What does the optic nerve do?

• transmit impulses from retina to brain

• helps the eye focus

• receives light and sends it to brain

• transmits light rays to retina

What does the iris do?

• transmits light rays to retina

• helps the eye focus

• sends messages to the brain

• a muscle that regulates how much light enters the eye

What does the sclera do?

• protects the eye

• helps the eye focus

• allows light to enter eye

• transmits light rays to retina

This structure is the back of the eye and it sends images to the optic nerve.

• Cornea

• Lens

• Retina

• Pupil

The hole in the iris gets bigger and smaller because

• the iris is a muscle that moves to make the pupil larger/smaller

• the pupil can adjust itself to the amount of light coming in

• the pupil is a muscle that controls the size of the iris

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

• sclera

• lens

• pupil

• cornea

The iris in a human can be

• brown

• green

• blue

• all of the above

Number 6 in the diagram is the ______________ and number 7 in the diagram is the _______________

• Optic nerve, retina

• Optic nerve, blind spot

• Blind spot, retina

• Blind spot, optic nerve

#1 Refers to the clear tissue that covers the front of the eye

• Retina

• Cornea

• Pupil

• Iris

In dim light, your pupil will be 

• larger
• smaller