Glaucoma is a silent threat—one of the leading causes of vision loss that often strikes without warning. The most common form, open-angle glaucoma, develops slowly and painlessly, stealing peripheral vision long before most people notice a problem. The good news: modern eye care has transformed how we detect and manage it. Today’s advanced imaging, improved medications, and tailored treatments mean earlier diagnosis and better outcomes than ever before. But the key takeaway is simple and urgent—because symptoms rarely appear early, routine eye exams are your best defense. Especially after age 40 or with added risk factors, staying proactive could mean the difference between preserving your sight and losing it.
Glaucoma is one of the leading causes of vision loss, yet many people know very little about it until damage has already begun. In general, there are two main types of glaucoma: open-angle glaucoma and angle-closure glaucoma. Open-angle glaucoma is far more common, so in this newsletter I want to focus on that form of the disease. In a future issue, I will discuss angle-closure glaucoma.
Years ago, a diagnosis of glaucoma often carried a much poorer outlook than it does today. Treatment options were limited, medications were harder for patients to tolerate, and the disease was often diagnosed too late. In many cases, patients did not notice symptoms until significant and permanent vision loss had already occurred. Fortunately, diagnosis and treatment have improved dramatically over the past several decades.
Open-angle glaucoma is typically painless and develops slowly. Because vision loss often begins in the far peripheral field, many patients do not realize there is a problem until damage has already progressed. That is what makes regular eye examinations so important. Today, glaucoma is no longer diagnosed based on eye pressure alone. Modern diagnosis involves evaluating the optic nerve, scanning the retinal nerve fiber layer, and measuring the visual field. Eye pressure remains an important warning sign, but it is only one part of the full picture. Some people may have pressures in the 20s and never develop glaucoma, while others may have so-called low-tension glaucoma, where optic nerve damage occurs even though eye pressure is not especially high. In the end, glaucoma is diagnosed by identifying damage to the optic nerve and nerve fiber layer.
Treatment has also come a long way. Many modern medications require only once- or twice-daily dosing and are generally better tolerated than older therapies. Some medications combine multiple agents for improved effectiveness. If drops are not enough to control the disease, surgical options may also help lower eye pressure. The goal of treatment is to preserve vision while avoiding unnecessary treatment too early. In glaucoma care, timing matters. If treatment is needed, the doctor will usually set a target pressure and monitor the response carefully, often rechecking in about a month and adjusting as needed. Once the condition is stable, follow-up intervals may be extended based on the amount of damage and the patient’s risk level.
The most important message is simple: glaucoma often has no early warning signs, so routine eye care is essential. Adults over 40 should have regular annual eye exams, and exams may be even more important for patients with a family history of glaucoma, a history of eye injury, long-term steroid use, or elevated eye pressure. Patients often ask whether lifestyle factors matter. In some people, caffeine and nicotine may contribute to higher eye pressure. I have personally seen patients with glaucoma or glaucoma suspicion experience modest reductions in pressure after eliminating both.
If your eye doctor sees a suspicious optic nerve, elevated eye pressure, or other risk factors, additional testing may be recommended. If those tests are normal, treatment may not be necessary right away — but close follow-up is essential.
Guard your precious vision with annual eye exams, including eye pressure measurement and a thorough evaluation of the retina and optic nerve.
Gary Nesty, O.D.