1, color blindness test chart is Japan's IshiharaTest Ishihara's color blindness test atlas of the international standard color blindness test method used, the doctor will generally let the test person to look at a card with a lot of colors, and the test only need to see that there are a lot of the same color of the dots connected together to come up with what the pattern can be.

2, color blindness picture on the main color will be different from the surrounding, color vision of normal people can distinguish, most of the pattern is connected to some numbers or small animals and so on, there will be different shades of red, green and blue color composition, if you can not identify one or all of them, is a color blindness visual anomalies.

3, if the detector really can not see, at this time should be honest with the doctor, so that the doctor to identify the detector is a color weakness or color blindness, found that there are color vision anomalies, should be timely to the regular authoritative hospitals to accept the examination, to facilitate the treatment, to avoid improper color discrimination and cause irreparable losses.