One kind of light-sensitive
cell in the retina. Cones give you color vision in bright light.
of light-sensitive cell in the retina. Rods respond in dim light.
where the optic nerve leaves the retina. Each eye has a blind spot where
there are no light-sensitive cells.
of nerve fibers that carry information from the retina to the brain.
shiny material located behind the retina. Found in animals with good night
vision, the tapetum reflects light back through the retina.
tough, white outer covering of the eyeball.
The thick, clear jelly that helps give the eyeball its shape.
flexible structure that makes an image on the eye’s retina. The
lens is flexible so that it can change shape, focusing on objects that
are close up and objects that are far away.
that controls how much light enters the eye. It is suspended between the
cornea and the lens. A cow’s iris is brown. Human irises come in
many colors, including brown, blue, green, and gray.
fluid that helps the cornea keep its rounded shape.
is the dark circle in the center of your iris. It’s a hole that
lets light into the inner eye. Your pupil is round. A cow’s pupil
clear covering over the iris and the pupil that helps protect the eye.
Light bends as it passes through the cornea. This is the first step in
making an image on the retina. The cornea begins bending light to make
an image; the lens finishes the job.
of light-sensitive cells at the back of the eye. The retina detects images
focused by the cornea and the lens. The retina is connected to the brain
by the optic nerve.