For those already diagnosed, once your treatment is effective and your glaucoma is stable then you should visit your eye care practitioner as directed by them. You may need to go back more frequently when you first go onto medications, or when your medications are changed or if your glaucoma is not stable. Your eye-health practitioner will advise you of the frequency that is most suitable for your case.
If you have never been checked for glaucoma, then you should go to your optometrist and start being checked by the age of 35 years. Early detection, through regular and complete eye exams, is the key to protecting your vision from damage caused by glaucoma.