http://www.ck12.org Chapter 1. Human Biology
FIGURE 1.87
The human eye is a complex structure
that senses light; the light passes through
the cornea, pupil, and lens, and is focused
on the retina.- The brain makes sense of the nerve impulses and tells you what you are seeing.
FIGURE 1.88
Light from objects at different distances is
focused by the lens of the eye. Muscles
in the eye control the shape of the lens so
the light is focused on the back of the eye
no matter how far the object is from the
lens.Vocabulary
- cone: Cone-shaped cell in the retina of the eye that detects light of different colors.
- cornea: Clear, protective covering on the outside of the eye.
- lens: Clear, curved structure that helps focus light on the retina at the back of the eye.
- optic nerve: Nerve which carries impulses from the eye to the brain.
- pupil: Black opening in the eye that lets light enter the eye.
- rod: Rodlike cell in the retina of the eye that is sensitive to dim light.
- retina: Part of the eye that contains light receptor cells.