B3.1 eye Flashcards
1
Q
describe what happens when the eye focuses on near options
A
- ciliary contracts
- supersensory ligaments relax
- lens becomes round
- light refracted more
2
Q
describe what happens when the eye focuses on far objects
A
- ciliary relaxes
- supersensory ligaments pull tight
- lens becomes less round
- light refracted less
3
Q
what is the cause of color blindness and how can it be treated
A
- when red or green cones in the retina are not functioning properly
- tinted glasses can make colors appear normal
4
Q
describe long sightedness
A
- people cant focus near objects
- eyeball too short
- image forms behind the retina
- fixed with convex lens
5
Q
describe short sightedness
A
- people cant focus far objects
- eyeball too long
- image forms in front of the retina
- fixed with concave lens or cornel laser surgery
6
Q
describe the function of the iris
A
- Controls how much light enters the pupil
7
Q
Lens
A
Focuses light onto the retina
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8
Q
Retina
A
Contains the light receptors
9
Q
Optic nerve
A
Carries impulses between the eye and the brain
10
Q
ciliary muscles and suspensory ligaments
A
- change the shape of the lens
