What is the Ishihara Test?
Ishihara Test, aka pseudo-isochromatic plates, is a perception test for people having a red-green color deficiency. This is one of the most successful color vision tests for colorblind people, and the test was very helpful for color blind. Ophthalmologists use this test to check if your eyes suffer from color vision deficiency.
The Ishihara test comprises Ishihara plates with small solid circles of random size and color. The dot pattern forming number or shapes might be easy to figure out by a normal vision person, but a colorblind person starts getting confused with the random colors. Some circles are intentionally in different colors that make a particular number, which a colorblind person needs to find out.
There are 10 plates in total in this online Ishihara test, and the existence of a severe deficiency is usually found after a few plates.
The unique part about the Ishihara test is that it has some notable plates that colorblind people can only solve. So, if a person solves that particular plate, there is a high possibility they are color blind. This type of test is also called as reverse color blindness test.
Who Created the Ishihara test?
The name was inspired by its creator, Shinobu Ishihara, a Ophthalmology professor at the University of Tokyo. This test was firstly published in 1917, and since then, no other color deficiency test has beaten its success rate.
Initially, the Ishihara test came in three versions, two in Japanese and one in Arabic. The main intention behind the test formation was to test the vision of Japanese soldiers in the Imperial Japanese army. After some years, the third version of the test, written in Arabic, became popular in the west.
From the day the Ishihara test was invented, it went through numerous changes to become the test it is today that thousands of people use because they trust its reliability.
The plates you will see in this Ishihara test are printed, which suggests the test's accuracy. It uses proper lighting to lighten up the page, which helps in playing the game. The one that helps to give the most accurate results is the 'daylight' bulb illuminator, which is around 6-7k temperature.
In the test, the colors commonly used are fluorescent, but there is a vast difference between fluorescent bulbs and CRI colors. Each card's image comprises two different colors; the first color is randomly spread out, and the second color indicates a number.
The real intention is to guess the number on the plate within 3 seconds. Also, touching or tracing isn’t allowed for the subject. The people with color deficiencies will see the numbers according to the type of color blindness they have. They might see a different color or see no numbers at all. It is better to take a test in random sequence so that the subject cannot memorize the answer.
Ishihara tests also help determine a person's color deficiency type. So, the Ishihara test works both ways to know if you have a color deficiency and determine the color deficiency type.
Different types of Plates and their Importance
There are 6 different types of plates in the Ishihara test, demonstrating something different. Following are the various plates designs:
- Demonstration plate: Every test begins with the demonstration plate that every average individual and color deficiency type can solve. This plate generally displays the number 12, and the primary intention is to make people understand the test function. The scoring of this plate is not counted overall in the test or the diagnosis. The demonstration plate is shown to give an idea about the game.
- Transformation plate: In this plate, people with color deficiency will see a different number, and people with normal vision will see something different. For instance, a colorblind person will see the number 8 when the normal person can see number 5.
- Vanishing plate: In the vanishing plate, people with normal vision can see a number in the middle, but people with color deficiency will feel as if there are no numbers on the plate. They will only see random colors spread out.
- Hidden Digit plate: The hidden digit plate works as opposed to the vanishing plate. If a person can see the number on the plate, they have a color deficiency. If you cannot see a number at all, that means you have a perfect vision.
- Tracing plate: Tracing plate is different from the other plates because here, you need to find a line rather than a number. The line usually comprises random red-green dots, and people with color deficiency find it challenging to trace the line.
- Diagnostic plates: These kinds of plates only help determine the type of color deficiency a person has. Also, with a diagnostic test, you can find out the severity level of the color deficiency.
The number and rotation differ according to the diagnosis of the entire test and the 38 plates. When you are done with the Ishihara test, you will have the exact results of your condition.
Is the Ishihara test available online?
Yes, the Ishihara test is available online for your ease. All you need to do in the game is to answer the 10 plates, and by the end of the game, you have your test result.
This simple color blindness test online will show all your weak and strong points. Taking the test online is much cheaper and gives you results in no time. But if you wish to take this to a medical expert, an ophthalmologist will be an excellent option for accurate results. Or, just try taking the test once online, and if anything comes up, seek expert advice.
Is this Online test accurate?
The Ishihara test is used in various countries and continents and compared to all the tests online; this one makes the most vital point. So, as far as a color deficiency is concerned, an Ishihara test will help you determine whether or not you are suffering from the condition.
This online test is accurate and more accessible than the clinical methods. It works just like a professional test, but instead of 38 plates, you only get 10 plates here. It will take a less time for you. Also, you get the options of numbers and shapes. If you have a kid at home, you can use the shaping plate for easy results. In short, the Ishihara test is your best bet!
This Ishihara test by colorblindtest.us give you an option to test your deficiency. This will give you an idea about color blind. For Detail diagnosis, we recommend to consult an Ophthalmologist.
Where is the Ishihara test used?
The Ishihara test is used by the US army for color vision screening. For someone to pass, they need to score at least 12 on the test. Only the red/green plates are included in the test, not the demonstration plates.
In the early days, the Ishihara test was used by the Japanese army to test the eyesight of the Japanese military. But after the Arabic version was out, it was highly appreciated in the west. Today, the Ishihara test is used by every other country worldwide as people swear by its accuracy.
Other than this, ophthalmologists also use the same test to determine your color deficiency. And if the issue is predicted, then the same test also helps to know the color blindness type.