9-1 The Eye

Identify the structure of that refracts light - bends it as it enters the eye

• Lens

• Pupil

• Retina

• Iris

Which tissue contains the light receptors?

Which structure controls how much light enters the pupil?

• Conjunctiva

• Cornea

• Sclera

• Iris

Identify the structure that further refracts light to focus it onto the retina

To focus on a near object – the lens becomes ..................., this allows the light rays to refract (bend) more strongly.

Identify the term for short-sightedness

• Cataracts

• Hyperopia

• Accommodation

• Myopia

What shape of lens could be used to correct hyperopia?

Identify the process that can reshapes the cornea

• Laser surgery

• fMRI

• EEG

• Lens replacement surgery

What happens when the ciliary muscles contract?

• The suspensory ligements Slacken/loosen

• The shape of the lens becomes thin

• The suspensory ligaments stretch/tighten

• Light is only refracted slightly

Which type of receptor is more sensitive to light?

• Rods

• Cones