How the Eye Works
Your eyes and brain work together to make it possible for you to see. Light is reflected from
objects onto the front surface of your eye, the cornea. The cornea bends the light, which then
passes through fluid called the aqueous humor, through the pupil, and to the lens. The lens,
which can change its shape, helps to focus light onto the retina at the back of the eye. On the
retina, light forms an upside-down image on the cones and rods, the light sensitive receptors in
the eye. The cones and rods send images to the brain via the optic nerve.
Shortly after leaving the eye, the optic nerves from each eye cross and separate, sending their
fibers to receiving and analytical stations in the brain. In effect, the brain receives messages
from both eyes. Besides interpreting the visual input, if movement of both eyes is coordinated,
the brain fuses images from each eye together to form one three-dimensional image.
Your eyes and brain work together to make it possible for you to see. Light is reflected from
objects onto the front surface of your eye, the cornea. The cornea bends the light, which then
passes through fluid called the aqueous humor, through the pupil, and to the lens. The lens,
which can change its shape, helps to focus light onto the retina at the back of the eye. On the
retina, light forms an upside-down image on the cones and rods, the light sensitive receptors in
the eye. The cones and rods send images to the brain via the optic nerve.
Shortly after leaving the eye, the optic nerves from each eye cross and separate, sending their
fibers to receiving and analytical stations in the brain. In effect, the brain receives messages
from both eyes. Besides interpreting the visual input, if movement of both eyes is coordinated,
the brain fuses images from each eye together to form one three-dimensional image.
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