Color Blindness - Types And Causes



Color Blind Test is a free online test that helps you to test color blindness type and level of color blindness using 38 circular Ishihara plates. 


The Ishihara Test is a color blindness test consisting of a series of colored plates, known as the Ishihara chart, which contain dots in various arrangements and colors. 


The test is named after its creator, Dr. Shinobu Ishihara, who first published it in 1917.


It was designed with two purposes in mind: 1) to identify red-green color deficient people; and 2) as an educational tool for children by introducing them to hues that are not found on their color wheel.


What Is The Color Blind Test?

The color blind test is a free online color vision test that is designed to evaluate the type and level of color blindness for adults and children.


The test includes 38 circular Ishihara plates that include printed digits created by unique random dots of multiple colors and shades. 


The plate will be shown in the test to the person and asked which number will be seen.

The color blind test is used by - 

  • Commercial Artist
  • Marketing Professional
  • Designer
  • Electrician
  • Government Jobs
  • Army Training
  • Eye Doctors


What Is Color Blindness?

Color Blindness Test, also known as color vision deficiency, is a condition in which people cannot see color or differentiate between colors. 


They may only see similar shades of colors as compared to people with normal color vision.


People suffering from color blindness are not aware that they have a problem with color vision until they are tested. 


The most common type of color blindness is inherited, which means it is passed down from parents to children.


In most cases, color blindness affects both eyes equally. Sometimes, only one eye may be affected. There are different degrees of color blindness, ranging from mild to severe.


There is no cure for color blindness, so people adopt it and live their life as normal by using special contact lenses or glasses that can help them to see colors.


Color Blindness: How It Happens?

According to a study, about 1 in 12 men, and 1 in 200 women are color blind.

Poor color vision can be caused by:

  • Genetics
  • Aging
  • Certain medications and diseases
  • Exposure to chemicals


Certain diseases can cause color vision impairment, including:

  • Diabetes
  • Alcoholism
  • Macular degeneration
  • Leukemia
  • Alzheimer's disease
  • Parkinson's disease
  • Sickle cell anemia


People can improve their color vision deficiency(CVD) by receiving proper treatment for the underlying condition.


Different Types Of Color Blindness

According to doctors and researchers, there are three types of color blindness that occur -

1. Red-Green Color Blindness

Red-green color blindness is the most common form of color blindness, affecting up to 8% of males and 0.5% of females. 


People with red-green color blindness have a problem distinguishing between Red and Green colors and their shades.


It is caused by defective red pigment cones and green pigment cones. It is typically passed down from parents to children through an autosomal recessive inheritance pattern.


There are four main types of red-green color blindness:

  • Deuteranomaly (Green cone dysfunction)
  • Protanomaly (Red cone dysfunction)
  • Deuteranopia (Green cone loss)
  • Protanopia (Red cone loss)


2. Blue-Yellow Color Blindness

Blue-yellow color blindness affects about 4.5% of men and 0.5% of women. It occurs when there is a problem with the blue sensing cone cells in the retina.


As a result, people with blue-yellow color blindness have the problem of distinguishing between blue and green colors, and between yellow and purple.


It can be mild, moderate, or severe, depending on the severity of the cone cell deficiency. 


There is no cure for blue-yellow color blindness, but it is possible to manage the condition through the use of special lenses or contact lenses.


3. Total Color Blindness

Total color blindness, or achromatopsia, is very rare, affecting only about 1 in 33,000 people. 


Total color blindness, also known as color vision deficiency or CVD, is a vision disorder that causes individuals to have a problem distinguishing any colors.


It is caused by faulty genes and can affect people of any age. However, total color blindness can make specific tasks and activities more challenging.


Total color blindness should not be viewed as a hardship but rather an opportunity to learn new ways of looking at the world around us.


Frequently Asked Questions

1) At What Age Can A Child Be Tested For Colour Blindness?

Our color blind test does not have any age criteria it can take anyone who have basic knowledge of number from 1 to 10.


2) When Are Kids Tested For Color Blindness?

If kids can recognize the number on the screen then he/she can take a test.


3) How Accurate Are Color Blind Tests?

The test provided by colorblindtest.us is much more accurate than any other test on the internet it is verified by more than 25+ eye doctors and uses as primary testing.


4) What Tests Can Detect Defects In Color Vision?

Our test can detect the type of color blindness type and level of blindness as well as provides a brief analysis of your test and some important tips to live like normal people.


5) What Is The Name Of The Test Used For Color Blindness?

The color blind test is the doctor-verified test that is mostly used by people, government job seekers, and much more industries in the world.


6) What Is A Common Test For Color Blindness Or Color Weakness?

Following are the common color blind tests -

  1. Ishihara Test
  2. Farnsworth 100 Hue Test
  3. Farnsworth Lantern Test