Primary glaucoma is a bilateral disease that usually develops first or second, and in about 10% of patients, both eyes develop at the same time. If both eyes develop at the same time, is it possible to have surgery at the same time? This is not allowed in Beijing Tongren Hospital, and surgery is performed on one eye before the other. This is because there is a risk of infection and complications, and the reason for not having both eyes operated on the same day is to ensure the safety of both eyes. Usually both eyes will be medicated first when they develop, and the IOP will be controlled by oral and infusion as well as topical spot medication. If it is not really under control then one eye will be operated on first and then the other eye.