You perceive colour the way you perceive taste. Every time you eat, your taste buds can sense four attributes—salty, sweet, bitter and sour. Similarly, when you look at something or a scenery, your visual nerves register colours in terms of their attributes—the amount of yellow or blue, the amount of red or green and the brightness of the colour.
Your eyes are likened to a television camera which has the capability to self focus, has self-cleaning lenses and with images that can be processed by a computer. When your eyes see, exterior light is focused by your lens onto your retina. The light is then absorbed by pigments contained in light sensitive cells; cylindrical-shaped rods and conical-shaped cones.
Most animals have two types of cones while higher primates such as humans have three types of cones. However, your eyes are not perfect. True point is not imaged onto your retina. Instead, the point is imaged into a diffuse area which is called a blur circle. As people age, chromatic aberrations can cause coloured fringes. This means that the lenses in your eyes can turn yellow.
Your eyes know how to compensate for their many flaws. The nerve cells would compare the cones’ signals to measure the amount of blue or yellow and green or red, especially along the image’s edges.
A person has an average of 6 million cones in his retina. The retina is the never layer located at the back of your eyes. All these cones are sensitive to brightness. In humans, the three different cones are all sensitive to wavelengths that are short, medium and long.
Some people have colour vision disorder. A person is colour blind if he is incapable of distinguishing the difference between one colour to another. The condition is caused by the absence of pigments that are colour sensitive in your retina’s cone cells.
Many colour vision disorders are inherited or congenital. About 1 in every 20 women and 1 in every 12 men are colour blind.
A person who is colour-blind has difficulty distinguishing the colours of green, blue, red or the mixtures of these three colours. The most common colour-blindness is the difficulty of distinguishing between red and green colour with both colours appearing as one and the same to a colour-blind person.
There are medical tests available for colour-blindness. It would be best to consult a professional medical expert to learn more about your possible colour vision problem.e development of dyes and chemical pigments helped brought industrial prosperity to many countries, especially in northern Europe. And the expanding discoveries and developments in colour science have created new industries as well as remarkable changes in taste and fashion.