Dichromacy

Dichromacy is a condition characterized by the inability to perceive full color. This condition is a type of color blindness and is typically inherited. Dichromacy is divided into three types: protanopia, deuteranopia, and tritanopia.

Types of Dichromacy

Protanopia

Protanopia is a type of dichromacy where the individual has a complete absence of red retinal photoreceptors. People with protanopia perceive red as black, and certain shades of orange, yellow, and green as yellow.

Deuteranopia

Deuteranopia is a type of dichromacy where the individual has a complete absence of green retinal photoreceptors. People with deuteranopia perceive green as beige, and red as brown.

Tritanopia

Tritanopia is a type of dichromacy where the individual has a complete absence of blue retinal photoreceptors. People with tritanopia perceive blue as green, and yellow as violet or light grey.

Causes

Dichromacy is usually an inherited condition, caused by a mutation in the genes that influence the development and function of the cone cells in the retina. These cells are responsible for detecting color.

Diagnosis

Dichromacy can be diagnosed through a comprehensive eye examination. Tests such as the Ishihara Color Test or the Farnsworth-Munsell 100 Hue Test can be used to determine the presence and type of color blindness.

Treatment

There is currently no cure for dichromacy. However, special color corrective lenses can be used to help individuals distinguish between different colors.

See Also

• Color blindness
• Protanopia
• Deuteranopia
• Tritanopia
• Ishihara Color Test
• Farnsworth-Munsell 100 Hue Test

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  Dichromatic color vision diagram
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  Deuteranopia sight simulation
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  Tritanopia sight simulation