|
|
Colour is a term used for a particular part of
the description of the appearance of an object. Colour is not a property
of light, colour is a sensation perceived by the brain in a similar way
to sound, touch, smell and taste. |
|
|
Sight can be considered as the most important of the senses,
since it has been estimated that four-fifths of the information our senses
gather about the world is through our eyes |
|
|
At medium and high levels of illumination the three types
of cones cells are sensitive to light and the rod cells are insensitive
to light. |
|
|
The first detailed account of impaired colour vision was
by the chemist John Dalton and his brother in 1798; as a result it is often
called Daltonism. Impaired colour vision can be hereditary or acquired as
a symptom of disease or an injury to the head. |
|
|
The presence of three types of "colour" receptors
in the retinal layer confirmed the ideas that had been proposed in the trichromatic
theory of human colour vision |
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
