Home > Health Library > Eye Anatomy and Function
The eye is shaped like a round ball, with a slight bulge at the
The eye has three main layers. These layers lie flat against each
other and form the eyeball.
The inside of the eye is divided into three sections called
Fluid fills most of the inside of the eye. The chambers in front of
the lens (both the anterior and posterior chambers) are filled with a clear,
watery fluid called aqueous humor. The large space behind the lens (the
vitreous chamber) contains a thick, gel-like fluid called vitreous humor or
vitreous gel. These two fluids press against the inside of the eyeball and help
the eyeball keep its shape.
The eye is like a camera. Light passes through the cornea and the
pupil at the front of the eye and is focused by the lens onto the retina at the
back of the eye. The cornea and lens bend light so it passes through the vitreous gel in the back chamber of the eye and is projected onto
the retina. The retina converts light to electrical impulses. The optic nerve
carries these electrical impulses to the brain, which converts them into the
visual images that you see.
Current as of:
June 11, 2013
Kathleen Romito, MD - Family Medicine & Christopher J. Rudnisky, MD, MPH, FRCSC - Ophthalmology
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