A person with red-green color blindness cannot accurately distinguish between red and green, and if the person wants to identify if they have red-green color blindness, they can be checked with a chromatogram. When examined with a chromatogram, a person who is red-green colorblind is unable to discern the patterns on the chromatogram, and a person who is colorblind can discern the sharp patterns in the picture. A person with red-green color blindness is unable to recognize red and green colors properly, but it usually does not affect the patient’s vision. If the patient himself wants to make the identification, the patient can take red or green things to identify, if he can identify red, but can not identify green, then green color blindness. If the patient can identify green but not red, he/she is red color blind. If he/she cannot identify both red and green, he/she is red-green color blind. It is recommended that patients with red-green color blindness seek medical attention to evaluate their condition and follow the doctor’s instructions for treatment.