Deuteranomaly

Deuteranomaly

Also known as Deuteranopia

Introduction Color vision deficiency refers to a hampered ability to differentiate colors. Deuteranomaly is a type of color vision defect characterized by an inability to discriminate the green shades. The patient is considered as ‘green weak.’

Causes and risk factors

Deuteranomaly 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 differentiate hues of green. Green objects appear of a darker colour, such as black. Differentiation of the red, yellow, and orange colors is affected. Even though the shades are wrongly perceived, the intensity of the colors remain unchanged. Thus the brightness is not affected.

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 deuteranomaly or any other color vision deficiencies. Using contact lenses can, however, improve the condition.

Complications

Individuals with deuteranomaly usually do not have any difficulties in managing day-to-day life.

When to contact a doctor

Contact a doctor as soon as you experience any defects in recognizing green, red, orange, or yellow shades.

Prevention

Being a hereditary condition, no preventive measures are available.

Facts and figures

Deuteranomaly affects about 5-6% of male population and 0.3 to 0.4% of female population.

Systems involved

Ophthalmology.

Organs involved

Eyes

Recent updates

Nowadays, many advanced contact lenses have been developed in order to improve the color vision in individuals with deuteranomaly.

 

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