What color the color-blind eyes see when they look at something depends largely on the type of color blindness. In case of red blindness, the eye has no ability to recognize the color red, so everything red is blocked out in the object in front of it. The same applies to green blindness and blue blindness. Therefore, if color blindness exists in the eyes, it is important to go to a proper hospital for a color vision test to clarify the exact type. This disease is a congenital hereditary disease, usually due to sex chromosome recessive inheritance, so the incidence of this condition is higher in men. Of course, there are still a few cases of acquired color blindness, usually secondary to certain optic nerve or retinal diseases, which can still be recovered if treated with active etiology.