Colorblind Eye Test

Testing Color Vision Efficiency

Ishihara color test is the most common colorblind eye test used for diagnosing various types of color deficiency.

Color blindness is a malfunction of the retina. Retina converts light energy into electrical energy that is then transmitted to the brain through the optic nerve. This conversion is accomplished by two types of photoreceptor cells in the retina: rods and cones.

Common Types of Color Vision Deficiency:

• Protanomaly (1% male population) - Characterized by 'red weakness'. They see less of red, hence will tend to miss the reddishness of purple and mistake it for blue, for example.

• Deuteranomaly (5% male population) - This is the opposite of protanomaly and is characterized by its 'green weakness'. This man too will have difficulty perceiving purple and mistake it to be reddish.

• Dicromasy (2% male population) - They see no perceptible difference between red, orange, yellow, and green. They are all same for them.

• Protanopia (1% male population) - The brightness of red, orange, and yellow dims down a lot. Even the red traffic lights may appear to be extinguished!

• Deuteranopia (1% male population) - Same problem but with less of dimming.

Let's try to get a feel of how these different types perceive the colorful world that this ours is!

Normal Tricolor Vision

Monocolor Vision

Red Defective Tricolor Vision

Green Defective Tricolor Vision

Blue Defective Tricolor Vision

Red Absent Bicolor Vision

Green Absent Bicolor Vision

Blue Absent Bicolor Vision

There is a beautiful online colorblind eye test available on the net at
ColorVisionTesting.com:

Keep visiting this page or bookmark it in order to find out what other colorblind eye test sources I keep adding to it for your convenience from time to time.

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