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The Nervous system
The eye
Accommodation
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What is accommodation?
Ability to look at
near
and
distant
objects is an example of a
reflex
Its an
automatic
reaction, not controlled by the
conscious
brain
Eye focuses
light
on the retina by changing the
shape
of the lens
Looking at near objects
To focus on near objects:
Cillary muscles
contracts
Suspensory ligaments
loosen
the lens is then
thicker
and
refracts
light rays
strongly
Looking at distant objects
To focus on distant objects:
Cillary muscles
relax
Suspensory ligaments are pulled
tight
the lens is then pulled
thin
and only slightly
refracts
light rays