Although light consumption of alcohol probably won't cause any health problems, drinking alcohol excessively can have harmful effects on your body, including your eyes. Heavy drinking of alcohol may cause problems with your vision and overall eye health including decreased visual performance, slow pupil reactions, decreased peripheral vision, decreased contrast sensitivity, optic neuropathy, frequent migraines and poor cosmetic appearance. Drinking alcohol can cause eye redness. Alcohol causes the blood vessels in your eyes to expand, making them more prominent. Moreover, alcohol consumption do cause itchy and watery eyes and theses symptoms will be disappeared when the eye drops are used. Hope this helpful.