Ishihara color vision test online

This is my online and free version of the Ishihara test for color-blindness. In addition to saying what exactly your deficiency, it also teaches us that no one has the truth about colors: Contains some images that color-blind people don't see at all, others that they see different from the rest and others that only they can see. One way or another, we all lose some nuance of reality...

Ishihara's test description

The test consists of 38 images or plates consisting of circles of different colors, and is designed to detect the two most common types of color blindness:

• Protanopia, which is total or parcial red-blindness, and
• Deuteranopia, the total or parcial deficiency to perceive green.

This test does not include cases of Tritanopia (blue-blindness) as they are very rare. And are really few people who see no color at all (that is, they see any color as gray). Beyond that, about 10% of people have some kind of daltonism, which means little more than "a difference in their perceptions of the colors." Of course, some are more extreme, too different ways of perceiving like most people do.

Just like some are more sensitive to cold than heat –without thereby living in another reality, in most cases there is a harmless shift or offset of colors: the world of who does not see red, for example, is richer in greens and blues, with shades that someone "normal" can not distinguish or appreciate; it is like the other colors have invaded and taken advantage of the space left by the missing color. This is a different sensibility, but not necessarily a disability.

The most common color blindness is a offset between red and green caused by a deficiency to perceive one of them or both. In varying degrees, we all have that shifted perception. When it is mild, protanopia is called "protanomaly" and deuteranopia is called "deuteranomaly". This test is designed to diagnose only the most extreme cases (the "nopias"), but may give you clues to subtle abnormalities (pay attention if you see some images more intense than others)...

Instructions and recommendations

• Below each Ishihara plate you will see buttons with options. Choose the one that best suits what you see after you have observed the image. Some may be ambiguous, so choose instinctively without thinking too much. The response speed is important because colors don't need to be thinked and there is no one to deceive.
• Be honest with yourself. Colorblind people confused certain tones with others but also can easily distinguish differences invisible to normal people; so there are images in which you may not see anything, though you were not color-blind, and others (most of them) in which unknowingly you will see something different than the others (although neither they are color blind).
• Don't worry about seeing or not seeing, nor afraid to say you see "Nothing". Nothing there to guess correctly, not a test that you must pass. At the end of the test will be revealled your diagnosis, ie: if you see as most people do or like a minority, which is neither good nor bad (or it would be good to belong to most if almost everyone was blind?).

Plate 1 de 38