Ring of muscular tissue that along with the lens control the fine focusing of light as it passes through the eye.
Back
iris
Front
A ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening.
Back
cones
Front
Sensory nerves in the retina of the eye having to do with color detection.
Back
optic disc
Front
Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve fibers, no rods or cones, and is thus insensitive to light.
Back
retina
Front
The light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information.
Back
rods
Front
Retinal receptors that detect black, white, and gray; necessary for peripheral and twilight vision, when cones don't respond.
Back
pupil
Front
The adjustable opening in the center of the eye through which light enters.
Back
lens
Front
The transparent structure behind the pupil that changes shape to help focus images on the retina.
Back
sclera
Front
Dense fibrous opaque outer coat enclosing the eyeball except the part covered by the cornea
Back
aqueous humor
Front
fluid in the eye, found between the cornea and the lens
Back
fovea centralis
Front
area consisting of a small depression in the retina containing cones and where vision is most acute
Back
choroid coat
Front
middle layer of the eye; contains blood vessels
Back
canal of Schlemm
Front
duct in the anterior chamber that carries filtered aqueous humor to the veins and bloodstream
Back
Optic nerve
Front
the nerve that carries neural impulses from the eye to the brain
Back
vitreous humor
Front
jellylike substance found behind the lens in the posterior cavity of the eye that maintains its shape
Back
suspensory ligaments
Front
A series of fibres that hold the lens of the eye in place
