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Visual Perception Essay

990 words - 4 pages

Visual perception

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The resulting perception is known as eyesight, sight or vision. Vision has a specific sensory system, the visual system.

|Contents |
|[hide] |
|1 Human Visual System |
|1.1 The Eye |
|1.2 The retina |
|1.3 The brain |
|2 Theoretical perspectives in the study of visual perception |
|2.1 Unconscious inference |
|2.2 Gestalt theory |
|3 See also |
|3.1 Directly related articles |
|3.2 Types of visual perception |
|3.3 Disorders/Dysfunctions |
|3.4 Related Disciplines |
|3.5 Other |
|4 External links |

[pic][edit] Human Visual System

Main article: Visual system

[edit] The Eye

Our eyes are our bodies most highly developed sensory organs.[citation needed] Light rays enter the eye by first crossing the clear cornea. Nearly two-thirds of the eye's focussing power occurs along the front surface. A normal cornea should have a round contour like a soup spoon, allowing the eye to create a single focused image.

[edit] The retina

[pic]
[pic]
Human eyes
The visual system is highly efficient in providing a rapid assimilation of information from the environment to help guide our actions. The act of seeing starts when the cornea and lens focus an image of the outside world onto a light-sensitive membrane in the back of the eye, called the retina. The retina is actually part of the brain that is isolated to serve as a transducer for the conversion of patterns of light into neuronal signals.
The lens of the eye focuses light on the photoreceptive cells of the retina, which detect the photons of light and respond by producing neural impulses.Light is absorbed by photopigment into two classes of receptors, rods and cones. There are approximately one hundred million rods and five million cones in the human retina. The rods are active under...

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