
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Transcribed Image Text:the fovea that contains a large number of photoreceptors. The
the retina. This region does not contain photoreceptors and is called
4. The lens is a slightly flattened sphere found behind the pupil and iris. What is
The
is the yellowish central region of
is the location where the optic nerve exits from
the
the function of the lens?
Cavities and
Chambers of the Eye: the eveball is divided into anterior and posterior
cavities by the lens and ciliary body with the following features.
a. The posterior cavity is the larger cavity found behind the
that is filled with a gelatinous material called
numor made mostly of collagen and water that helps maintain eyeball
shape.
b. The anterior cavity found in front of the
and ciliary body
is further divided into chambers that are filled with
humor, a watery fluid that flows through the chapters and is then
drained from the anterior cavity into the scleral venous sinus, a blood
vessel network.
Anatomy and Physiology of Vision.
A. Vision is the perception of light reflected by various objects in which our eyes and
visual pathways in the CNS can determine that objects size, shape, and color.
Object distance, rate and direction of movement can also be interpreted by this
special sense.
B. Principles of Light. The following summarizes the basic principles associated
with light
1. Some energy exists in the form of electromagnetic radiation with a range of
wavelengths measured in nanometers (nm) Visible light is the range of
wavelengths that the human eye can detect as a range of particular colors.
and
Shorter wavelengths of visible light are_
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