Eye Anatomy

sclera

Makes up most of the fibrous layer; white

cornea

Clear anterior portion of fibrous layer

ciliary muscle

A circular muscle that relaxes or tightens to change the shape of the lens.

Iris

Circular and radial muscles that adjust the size of the pupil

Rods

photoreceptive cells that are adjusted for dim light; perceive gray tones

Cones

photoreceptive cells that are adjusted for bright light; perceive colors

Aqueous humor

Between cornea and lens; supplies nutrients and maintains pressure

vitreous body

Gel-like, between lens and posterior; maintains eye shape

Eyelashes

Located on the margin of the eyelids. Prevent foreign substances from entering the eye.

Myopia

Difficulty focusing distant objects (nearsightedness)

Hyperopia

Difficulty focusing nearby objects (farsightedness)

tear duct

Small holes in the inside corners of the top and bottom eyelids. The small holes bring tears to keep the cornea moist and clear and constantly flow, washing away things like dust. The tear then carry away any accessible liquid in your eye.

Retina

Light sensitive layer of the eye; contains rods and cones