Glaucoma is one of the leading causes of irreversible blindness worldwide — and the vast majority of those affected don’t know they have it until meaningful vision loss has already occurred. Understanding what it is and how to catch it early is one of the most important things you can do for your long-term eye health.
What Is Glaucoma?
Glaucoma is a group of eye conditions characterized by damage to the optic nerve — the bundle of fibers that carries visual information from the eye to the brain. In most cases, this damage is associated with elevated pressure inside the eye (intraocular pressure, or IOP), though some people develop glaucoma with normal pressure as well.
The optic nerve damage is progressive and, critically, irreversible. Once nerve fibers are lost, they don’t regenerate.
Why “Silent Thief” Is Apt
The most common form — primary open-angle glaucoma — has no symptoms in its early stages. There’s no pain, no redness, no obvious change in how you see day-to-day. The initial damage occurs in the peripheral (side) vision, which the brain tends to compensate for without you noticing.
By the time central vision is affected, the disease has often progressed significantly. This is why regular eye exams are the only reliable way to detect it early.
Who Is at Risk?
Anyone can develop glaucoma, but certain factors significantly increase risk:
- Age over 60 — Risk increases with each decade
- Family history — Having a first-degree relative with glaucoma increases your risk substantially
- Elevated eye pressure — Not everyone with high IOP develops glaucoma, but it’s a major risk factor
- African or Hispanic ancestry — These populations have higher rates of glaucoma and often develop it earlier
- High myopia (nearsightedness) — Strongly associated with increased risk
- Corticosteroid use — Long-term use of steroid medications can raise eye pressure
- Previous eye injury
How Is Glaucoma Detected?
This is where your annual eye exam does crucial work. We screen for glaucoma using several tests:
Tonometry — Measures intraocular pressure. The “puff of air” test you may have experienced is one method; contact tonometry (using a numbing drop and a small probe) is more precise.
Optic nerve evaluation — Direct examination of the optic nerve through a dilated pupil, looking for characteristic changes in its shape and color.
Visual field testing — Maps your peripheral vision to detect early losses you might not notice yourself.
OCT imaging — Optical coherence tomography creates detailed cross-sectional images of the optic nerve and the nerve fiber layer around it, often detecting structural changes before visual field loss becomes measurable.
Can Glaucoma Be Treated?
Yes — and this is the good news. While glaucoma can’t be cured, it can be managed very effectively when caught early. Treatment typically involves:
- Eye drops — Most patients start with prescription drops that either reduce fluid production inside the eye or improve drainage
- Laser treatment — Selective laser trabeculoplasty (SLT) can improve drainage and reduce or eliminate the need for drops
- Surgery — For cases that don’t respond adequately to other treatments, surgical procedures can create new drainage pathways
The goal of all treatment is to lower eye pressure enough to halt or significantly slow nerve damage. Many people with glaucoma, diagnosed early and treated consistently, maintain good vision for life.
The Bottom Line
Glaucoma is not a diagnosis to fear — it’s a diagnosis to catch. Regular comprehensive eye exams are how we find it before it’s found you. If you haven’t had an exam in a while, or if you have risk factors, now is the time.
Book your exam online or call us at 860-676-2376.
