It is better not to drink any alcohol if you have glaucoma. We know that glaucoma is caused by increased pressure in eyes which will damage the optic nerves. Drinking alcohol is a stimulant just as caffeine, which will impact our contral nerve system and increase intraocular pressure. Normally glaucoma is chronic, and develop very slow. Doctor will require the patients to take eye examination on a regular basis to monitor the pressure in eyes and development of glaucoma. But if you drink alcohol, it will increase your eye pressure and cause more damages to your optic nerves and speed up the development of glaucoma. So if you are suffering from glaucoma, quit caffeine, smoking and drinking. Once it gets serious, you need to take a surgery to restore your vision otherwise you would be blind forever. Take good care of yourself.