Glaucoma: The Silent Thief of Sight — What You Need to Know

What Is Glaucoma?

Glaucoma is a group of eye conditions that damage the optic nerve — the cable that carries visual information from your eye to your brain. The damage is typically caused by elevated intraocular pressure, though some people develop glaucoma with normal pressure (normal-tension glaucoma). Once optic nerve fibers are lost, they cannot be regenerated. The vision loss is permanent.

Why It's So Dangerous

Glaucoma typically begins by affecting peripheral (side) vision. Because humans are remarkably good at compensating for peripheral vision loss — filling in gaps with expectation and central vision — most patients notice nothing until the disease has consumed a significant portion of the optic nerve. By some estimates, up to 40% of optic nerve fibers can be lost before a patient detects any vision change.

Who Is At Risk?

• Age over 60 — risk increases significantly with age
• Family history — first-degree relatives of glaucoma patients have a 4-9x increased risk
• African or Hispanic ancestry — higher prevalence and earlier onset
• High intraocular pressure — though not all high-pressure patients develop glaucoma
• Thin central corneas — associated with higher true IOP than measured
• History of eye trauma or long-term steroid use
• Extreme nearsightedness or farsightedness

How We Detect It

A complete glaucoma evaluation at Harnos Optometry includes measurement of intraocular pressure, assessment of the optic nerve with high-magnification imaging, corneal pachymetry (thickness measurement), and visual field testing. We also use optical coherence tomography (OCT) to image and measure the nerve fiber layer around the optic nerve — detecting structural changes before they appear as vision loss.

No single test tells the whole story. Glaucoma diagnosis and management requires longitudinal data — comparing your results to your own baseline over time. This is why consistent, annual care at the same practice matters.

Treatment and Prognosis

Glaucoma cannot be cured, but it can almost always be controlled. The goal of treatment is to lower intraocular pressure enough to stop or slow progression. Most patients are managed with daily prescription eye drops. Laser procedures and surgical options exist for cases that don't respond to drops. With early detection and consistent treatment, the majority of glaucoma patients retain good functional vision for life.

If you have any risk factors for glaucoma — particularly a family history — please don't skip your annual exam. This is one condition where the exam truly is the treatment.