Color Vision

Color Vision

Color Vision

3 things are necessary for sight. Light source, object and audience. The object that falls on the light is perceived by the eye and the sight is formed. The light itself is not visible, but colors can be perceived only when reflected from the surfaces. If all of the light is reflected, it is white. If no wavelength is reflected, it is black. If some part is absorbed and some part is reflected, other colors are visible. The spectrum that the human eye can see is between 390 and 750 nm.


The lower frequency wave from red is called infrared,

The higher frequency wave of the purple is cellared ultraviolet,

and they are not visible to the humans. In dense skeletal system films, x-ray beams are used and are in the infrared group. Radio waves are examples of ultraviolet rays.

What is color blindness ?

Distinguishing colors is called color blindness. It is usually a congenital disease. In some cases, the color vision may deteriorate later on when the light receptors in the retina are affected. It is more common in males.

Although there are many different types of color blindness, the most common type is red – green blindness. In a much more rare form all colors can not be seen and life in these people is black and white. Genetic susceptibility is a problem. So those who have color blindness in their family are more likely to be sick.


Color vision is of vital importance for some occupational groups and it is important to test it. Ishiara test, hardy rand rittler test, city university test, farnsworth munsell 100 hue test, Nagel anomoloscope is diagnosed by such methods.


Test Yourself !

Numbers at the first line: 12 – 8 – 6 -29 – 57

second line:  5 – 3 – 15 – 74 – 5

third line: 6 -57 – 5 -42 – 45


Is there any treatment for color blindness ?

There is no treatment today that will completely remove the color blindness. Recently, however, haloscopic filters called chromogen have been introduced for color blinds. It is used as a chromogen, contact lens or glasses. In people with color blindness, it enhances the contrast and brightness of colors and improves color separation. It is recommended to be practiced at the physician’s control.