Unfortunately, there is no guaranteed way to prevent glaucoma. Instead, your best bet is to catch it as early as possible in order to minimize vision loss. This requires undergoing regular eye exams on a schedule recommended by your doctor.
In order to maintain your vision once you have been diagnosed, it is essential that you take your prescribed medication daily and ensure that your prescription is filled regularly. Certain lifestyle changes can help you maintain your vision, as well, including keeping a healthy diet, exercising regularly, reducing your caffeine levels, staying hydrated, and sleeping with an elevated head.