Causes and risk factors
Protanomaly is a hereditary condition caused due to the malfunctioning of green photoreceptors (M-cone). It is a sex-linked disorder (X-chromosome), affecting predominantly the male gender.
Clinical presentation
The patient cannot properly discriminate hues of red, orange, yellow, and green-yellow. There is a shift of hue towards green. The hue as well as intensity of color is perceived wrongly. The intensity of color appears dim. The red shade may appear black. Purple or violet shades appear blue.
Investigations
This condition is diagnosed by an anomaloscope examination. Other tests include the Ishihara color test, the Farnsworth lantern test and the Farnsworth-Munsell 100 hue test.
Treatment
There is no cure for protanomaly or any other color vision deficiencies. Using contact lenses can, however, improve the condition.
Complications
Individuals with protanomaly may experience issues with driving vehicles.
When to contact a doctor
Contact a doctor as soon as you experience any defect in perceiving colors such as red, yellow, orange, or green.
Prevention
Being a hereditary condition, no preventive measures are available.
Facts and figures
Protanomaly affects approximately 1% of the male population and 0.01% of female population.
Systems involved
Ophthalmology
Organs involved
Eyes
