Description: Parts of the eye and its functions
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Structure of the Eye and Retina
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Ganglion cells
Receives messages from bipolar cells
(rods and cones) and the ganglion cells
Signals join together (close to the center of the eye)
and travel to the brain.- Blind spot
The ganglion cells form the optic nerve.
The point in which it leaves the eye is a blind spot
as there are no receptors.
- Blind spot
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Cones
Less active in dim light and are
essential in color vision.
Abundant in and near the fovea.- Red
Longwave
700nm - Green
Mediumwave
500nm - Blue
Shortwave
350nm
- Red
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Fovea
The pit at the back of the eye
that is specialized for acute,
detailed vision.- Rods
Respond to faint light and are
not useful in daylight.
Bright light bleaches them.
Abundant in the periphery
of the human retina. - blood vessels are almost absent
and ganglion
cells ensure unimpeded vision
- Rods
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Retina
Where the light is projected
at the rear surface of the eye.
Is lined with visual receptors.- Light always strikes
the opposing side
- Light always strikes
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Pupil
Center of the iris (colored area)
in which light enters through
and opening in the center and is
projected on the back of the eye.- Lens
Focuses the pupil, is adjustable - Cornea
Focus the pupil,
is not adjustable
- Lens
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