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Ashley Rivera
Julio Castro
David Almaguer
EYE
The human eye allows
us to see with color
and fine details and
movements.
The pupil regulates
the amount of light
with the iris. The
cornea is like a thin
shield to keep out
germs, dust, and other
harmful matter. It also
acts like a lens.A lens
changes shape to
refract light to be
focused on the retina
,which is on the back of
the eye.

The retina is the back of the inner eye that has photoreceptors. The
photoreceptors convert light energy into electrical signals for the brain.
The two photoreceptors are rods, which work best in dim light and
cones, which work best in bright light. The retina also have these things
called neurons which process visual information and even make up some
of the optic nerve.
Visual Transmitters:
Optic Nerve, Optic
Chiasm, Optic Tract
The Optic Nerve transmits
visual information from the
retina to the brain. This nerve
is the 2nd out of 12 paired
cranial nerves. If damaged
the consequences could be
permanent loss of vision.
The Optic Chiasm is where
both nerves cross. The
information from the left is
transmitted to the right and
vice versed.
The Optic tract is the
continuation of the optic
nerve and connect to the
lateral geniculate nucleus.
 The Lateral Geniculate Nucleus is located in the thalamus.
The lateral geniculate nucleus is the main center for visual
information in the brain. This receives input from the retinas
and optic nerve.
The visual cortex and
optic radiation
The visual cortex is in
the brain and is
responsible for
processing visual
information . It is in the
part of the brain called
the occipital lobe.
Optic radiation carries
the information to the
visual cortex and to
another part of the brain
called the calcarine
fissure.

Cataracts is a disorder when clouding occurs in the lens of
the eye. The lens focus on objects so with clouding the lenses
will decrease in vision efficiency.

Cataracts is caused by natural aging, trauma for water from
other parts of the eye entering ,and iodine deficiency.
The treatment for cataracts consists of surgery
performed at anytime.
 90% of patients get 20/40 vision or better
 Another way to fix cataracts is an artificial lens
inserted permanently
 A side effect of the treatment is retinal detachment(
Retina slowly peels away.

Works Cited
“Eye Health Center”. WedMD.N.p.2005-2013.Web.12 May 2013. < http://www.webmd.com/eye-health/picture-of-the-eyes>.
Johnson, George B. and Peter H. Raven. Biology. Austin :Holt, Rinehart, and Winston,2007.Print.
McGhee, Karen, and George McKay. “Eyes" Encyclopedia of Anatomy. Washington: National Geographic Society, 2007. Print.