Glaucoma is currently the leading irreversible blinding eye disease. Early detection and proper treatment are the only effective ways to prevent or delay the impairment of visual function. While treatment is a matter for ophthalmologists, early detection requires the efforts of the entire community. Below I will briefly describe the conditions that should alert you to the presence of glaucoma. The middle-aged and elderly are the most common group of people with glaucoma. Closed-angle glaucoma is the most frequent type of glaucoma. It can have acute or chronic onset. Patients with acute onset will have significant unilateral eye redness, eye swelling, eye pain, vision loss, a rainbow-like halo visible around the bright lighted cannon, ipsilateral periorbital swelling and pain, and may be accompanied by headache, nausea, and vomiting. Due to the presence of significant discomfort, these patients usually present to the hospital. It should be reminded that the acute onset usually occurs at night, and some elderly people are so distressed by their children that they cannot bear to wake them up to accompany them to the hospital, and endure until dawn. The longer it lasts, the more severe the damage to visual function will be, so you should seek medical attention as soon as possible. In addition, headache, nausea and vomiting can sometimes be so severe that they mask the discomfort in the eyes, causing patients to go to other departments and delaying their treatment. Patients with chronic onset of the disease may have milder manifestations of these symptoms, which may be accompanied by soreness at the base of the nose, usually without nausea or vomiting. These discomforts often appear in the evening, when fatigue or mood swings, and get better after sleep and rest, but can recur. Another type of glaucoma that is often seen in the middle-aged and elderly population is called open-angle glaucoma. This type of glaucoma is so insidious that it is often at an advanced stage of the disease when the patient is aware of it, so it should be given more attention. The vast majority of patients with early diagnosis of open-angle glaucoma are found during physical examinations or routine eye examinations for other discomforts. Therefore, routine ophthalmologic examinations should be performed for those over 40 years of age. Patients with a family history of glaucoma, or those suffering from high myopia, diabetes, hypertension, hypotension, or migraine, are more likely to develop glaucoma than the average person and should undergo routine eye examinations even more. For young people and teenagers, although the prevalence of glaucoma is not high, blurred vision is often mistaken as a result of visual fatigue or increased myopia, which can easily delay the disease. Therefore, people with a family history of glaucoma should go to the hospital for an eye examination, and those with increasing myopia should be examined by an ophthalmologist to confirm that there are no other eye diseases before getting an eye exam and glasses. Infants and children are prone to congenital glaucoma. They are afraid of light, and when they go to places with strong light, they like to bury their heads in their mothers’ arms and cry easily. Parents should bring their children to the doctor promptly if they encounter this condition. If you need to take drugs such as prednisone for a long time because of immune system diseases (e.g. lupus erythematosus), or order eye drugs containing dexamethasone or cortisone for a long time because of other eye diseases, you should monitor the eye pressure regularly for early detection of hormonal glaucoma.