Graphics Reference
In-Depth Information
Vision
many animal species such as a horse have night
vision. Eyes positioned on the sides of the horses'
heads allow them seeing in a range of about 350
o
,
while humans have about 180
o
field of vision. Part
of vision that is outside of the center of our gaze
is called peripheral vision; it is weaker in humans
than in many animal species.
Figure 5 presents a work “Peripheral Vision.”
Both precise and abstract impressions that reach
our vision combine into a whole reception of the
landscape.
The part of the electromagnetic spectrum that can
be seen by human eye is in the range of 390-750 nm.
A physician and physicist Hermann von
Helmholtz (1821-1894), followed by researchers
in several disciplines, explored the connection
between the visible spectrum and color vision
and developed theories about visual perception.
From about 150 million light-sensitive cells, rods
that identify shapes, especially in dim light, and
cones that that identify colors (if light is bright
enough) images are sent to the brain's visual cor-
tex, the outer layer of the cerebrum composed of
grey matter that relates to vision. Human vision is
imperfect in comparison to many animals, such as
owls, which can see in a dim light a mouse moving
in a distance over 150 feet away. Contrary to us
From a glass case of the car,
The outlook is different from the left,
a windshield, or the right window.
From behind, a big truck sends the harsh glare
of the headlights.
Figure 5. Anna Ursyn, “Peripheral Vision” (© 2007, A. Ursyn. Used with permission)
