What is Deuteranopia?

  
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October 17, 2019, by Bard Optical

deuteranopia

Color blindness affects around 1 in 12 men and 1 in 200 women, according to colourblindawareness.org

Deutan color blindness is a subtype of red-green color blindness and is considered the most common form of color blindness.

Don’t be confused by the name, though. Those with deuteranopia experience a variety of colors on the spectrum differently than those with ‘normal’ vision. Not only are reds and greens affected, but gray, purple, and some shades of blue can also be misrepresented to those with deuteranopia.

Deutan color blindness is split into two subtypes that are used to classify the different intensities of impairment. Deuteranomaly, or Anomalous Trichromats, is classified as everything between almost normal vision and deuteranopia. Deuteranomaly represents a much broader spectrum of intensity since it includes the less extreme versions of red-green colorblindness.

Those with deuteranomaly’s green sensitive cones are not completely missing, but they are less sensitive to light than the red cones. This is why green colors appear dull and colorless.

Deuteranopia, however, is used to describe the stronger cases of red-green colorblindness. Those with deuteranopia are completely missing the medium wavelength cones in the eye. This causes their spectrum of color to be very limited. For example, those with normal vision see 7 different hues, but those with deuteranopia only see 2 or 3. 

Symptoms of Color-Blindness

Most individuals that are anomalous trichromats, meaning they still have all three cones with one being defective, are still able to discern between yellows and blues. This means that spotting the symptoms of deuteranopia are not extremely difficult, as it revolves around the red-green portions of the color wheel.

For example, someone who has trouble discerning between red and green apples might be affected by deuteranopia, as is someone who can become confused at a stoplight, since they might not be able to tell the difference between the red and green lights.

While both of these examples are focused on the more extreme versions of deuteranopia, examples like these can be a major indicator that the affected person might not have normal vision.

The best way to tell if you are affected by deuteranopia, or any other color blindness, is to take a color blindness test. 

There are a variety of resources available to the public that you can use to test your eyesight independently. Often, it is wise to have your eye doctor help you through a test, as you will not only yield better results, but the doctor can more accurately explain your results to you, and the implications of whatever defects you may or may not have. 

Most tests involve a giant circle on a sheet of paper or a screen. Inside the circle are several other circles of different sizes, all brightly colored, and a series of circles that are colored differently and arranged to form a number. The object of the test is for the individual to be able to read the number that is in the circle. 

If you are unable to read a certain number, or see only the circles and no number altogether, the cones in your eyes may be defective towards that color. 

While these tests can be subjective, they usually help vision specialists paint a clear picture of the strengths and weaknesses of your eyesight, and they can be truly eye-opening to you, and show you exactly how you uniquely you see the world.

Color Blind Test Download