Yes, too much alcohol lead to color blindness. In addition, alcohol can also directly affect the retina, prevent retina from producing visual pigment, causing decline of eye adaptability to light. Therefore, those who are suffering myopia and glaucoma should refrain from excessive drinking. Moreover, (excessive) alcohol will lead to digestive and absorptive functions decline, which causes a lack of vitamins, inducing eye diseases such as conjunctivitis, optic neuritis, etc. Those patients who are suffering from diabetes or high blood pressure must give up drinking. After excessive drinking, one's blood circulation will speed up and eyes will be bloodshot, causing damage to retina or even go to blindness.