Structure of the Eye

The part of the eye that is white and tough.

• iris

• lens

• cornea

• sclera

Which part of the eye contains the photosensitive cells?

• sclera

• optic nerve

• retina

• iris

The iris has muscles that allow …

• the pupil to change shape.

• the eye to move from side to side.

• the cornea to change shape.

• the lens to change shape.

The blind spot can be found …

• where the optic nerve and retina meet.

• in between the sclera and retina.

• where the optic nerve and lens meet.

• in the middle of the iris.

The curved shape of the cornea is important because …

• it gives added protection to the lens.

• it increases the surface area of the sclera so that it fits into the eye sockets.

• it allows more light enter the eye because it has a bigger surface area.

• it causes light to refract towards the pupil.

The ciliary muscles and suspensory ligaments are important because …

• they change the shape of the cornea to refract light.

• they allow the iris to open and close.

• they change the shape of the lens and help the image to focus.

• they allow the eye to move from side to side.

This part of the eye carries electrical impulses to the brain.

• sclera

• blind spot

• retina

• optic nerve

This part of the eye changes light energy into electrical impulses.

• retina

• optic nerve

• lens

• sclera

In which part of the eye is light first refracted?  

• vitreous humor

• cornea

• conjunctiva

• lens

This is the coloured part of the eye.

• sclera

• lens

• iris

• pupil