Colour blindness

Colour blindness

It is a condition in which a person is unable to identify one or more colours.

Incidence

Male : it present about in 8% male.
Female : it present about 0.4% female.

Causes

• Injury to retina.
• Disease of retina.
• Inherited disease

Types

1. Monochromatism
2. Dichromatism
3. Trichromatism

Monochromatism

It is a rare condition in which a person is unable to identity any colour vision is similar to black and white photograph and everything looks grey.

Types

1. Rod monochromatism
2. Cone menochromatism

Dichromatism

In this condition person can identify only two basic colours.

Types

1. Protanopia / Primary dichromatism - Unable to identify red colour.
2. Deuteranopia / Secondary dichromatism - Unable to identify green colour.
3. Tritanopia / Tertiary diachromatism - Unable to identify blue colour.

Trichromatism

In this condition person can identify all three in colours but the intensity of one of primary colour can not identify properly.

Types

1. Protanomaly / Primary trichromatism - Intensity for red colour is less
2. Deuteranomaly / Secondary trichromatism - Intensity for green colour is less.
3. Tritalomaly / Tertiary trichromatism - Intensity for blue colour is less.