lesson 5 the eye Flashcards
the sclera is what
tough, supporting wall of the eye
the cornea is what
the transparent outer layer found at the front of the eye
it refracts (bends) light into the eye
the iris contains what
muscles that allow it to control the diameter of the pupil, therefore how much light enters the eye
what do the lens do
it focuses the light onto the retina
the retina contains what
receptor cells sensitive to light intensity and colour
the shape of the lens is controlled by which 2 things
ciliary muscle
suspensory ligaments
the optic nerve does what
carries impulses from the receptors on the retina to the brain
the iris reflex is essentially what
adjusting for bright light
very bright light can damage the retina, what do we prevent this with
iris reflex
what is accommodation
when the eye focuses light on the retina by changing the shape of its lens
another reflex in the eye if for what
looking at distant and near objects
the ciliary muscles do what,
(to focus on near objects)
it contracts which slackens the suspensory ligaments
the lens become what
(to focus on near objects)
fat (more curved)
in looking at near objects, it increases the amount by which of what
refracts light
in looking at distant objects from near objects what is it
vice versa
