Page 242 - Ultimate Visual Dictionary (DK)

THE HUMAN BODY

Eye Lateral
rectus muscle

THE EYE IS THE ORGAN OF SIGHT. The two eyeballs, protected
within bony sockets called orbits and on the outside by the
eyelids, eyebrows, and tear film, are directly connected
to the brain by the optic nerves. Each eye is moved by
six muscles, which are attached around the eyeball.
Light rays entering the eye through the pupil
are focused by the cornea and lens to form
an image on the retina. The retina contains
millions of light-sensitive cells, called
rods and cones, which convert the image
into a pattern of nerve impulses. These
impulses are transmitted along the optic
nerve to the brain. Information from
the two optic nerves is processed
in the brain to produce a
single coordinated image.

Vitreous humor

Macula

Central retinal vein
Central retinal artery
Pia mater
Arachnoid mater
Dura mater
Optic nerve

Area of
optic disk
Retina
Choroid
Sclera

Retinal blood vessel

Medial
rectus muscle

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