The mode of inheritance of red-green color blindness is X-chromosome recessive. Red-green color blindness, a congenital color vision abnormality, is mostly genetically related and is inherited in an X-chromosome recessive manner. The causative gene is on the X chromosome. Since males have only one X chromosome in their genes, red-green color blindness occurs as long as there is a causative gene on this X chromosome; whereas females need the causative gene on both X chromosomes in order to develop red-green color blindness. When a woman has the disease-causing gene on only one X chromosome, she will not develop red-green color blindness herself, but she will be a carrier of the red-green color blindness gene and pass it on to her next generation, who may develop red-green color blindness or become carriers of the red-green color blindness gene. If patients have symptoms related to color vision abnormality, they should go to the hospital and ask a professional doctor to evaluate them, and do not make judgment on their own, so as to avoid delaying their condition.