Physiology Eye and Ear

Which of the following describes the tough, outer tissue that covers the eyeball?

• choroid

• fovea

• sclera

• retina

What layer of the eye is described as the middle layer, which contains blood vessels and is deeply pigmented?

• sclera

• choroid

• retina

• cornea

The ________ is the innermost, light-sensitive layer of tissue of the eye.

• retina

• choroid

• fovea

• sclera

What structure is most responsible for refracting light rays which enter the eye?

• iris

• cornea

• lens

• retina

What is the transparent portion of the sclera?

• retina

• lens

• cornea

• fovea centralis

Vision is most acute when light rays are brought to focus on the optic disk.

• True

• False

The sclera of the eye is absent of blood vessels.

• True

• False

The anterior chamber of the eye is filled with vitreous humor.

• True

• False

The purpose of rods in the eye is vision in dim light rather than color vision.

• True

• False

Presbyopia is due to

• loss of elasticity of the lens

• unequal curvature of refracting surfaces

• an eyeball that is too long

• a flattened cornea