Intraocular pressure
A risk factor and a treatment target. Single measurements are less useful than trends and context such as corneal thickness and time of day.
Note: This article is educational and does not provide individual medical advice. If you have sudden vision loss, a curtain-like shadow,
severe eye pain with light sensitivity, or chemical exposure, seek urgent care.
Why glaucoma is different
It is often silent until late, and it is managed by measuring change over time.
Glaucoma is a group of diseases characterized by progressive damage to the optic nerve and corresponding visual field loss. Many people have no symptoms early because central vision can remain good while peripheral field gradually narrows. That is why testing and monitoring are the core of glaucoma care.
Glaucoma is often associated with elevated intraocular pressure, but pressure is not the whole story. Some people develop damage at normal pressures. Others tolerate higher pressures without measurable loss. This is why clinicians focus on target pressure, meaning a pressure low enough to slow progression for your risk profile.
The tests that actually matter
Pressure is one input. Structure and function are the outcomes.
Optic nerve structure
OCT imaging measures nerve fiber layers and ganglion cell complexes. The goal is detecting thinning over time, not chasing a single scan result.
Visual field function
Visual field tests measure functional sensitivity. They can be noisy, so patterns and repeatability matter. Trend analysis is often the most useful view.
What clinicians are trying to decide
Most plans are built around progression risk and evidence of change.
Glaucoma management is usually a set of decisions about risk. Is this ocular hypertension or true glaucoma? Is there evidence of structural or functional change? How fast is the change occurring? What pressure range is likely to slow it? The answers drive whether treatment is recommended now and how aggressive the plan should be.
Practical point: If you have glaucoma, a stable year is a win. The goal is preserving lifetime function, not producing a symptom you can feel today.
How treatment works at a high level
Most treatment focuses on lowering pressure using drops, laser, or procedures.
The most common first line treatment is eye drops that lower pressure by reducing fluid production or improving outflow. Laser procedures such as selective laser trabeculoplasty can be used early or as an alternative to adding more drops. Surgical options range from minimally invasive glaucoma surgery, often combined with cataract surgery, to more traditional procedures for advanced cases.
What symptoms should not be ignored
Most glaucoma is painless, but there is an acute emergency pattern that is different.
Typical chronic glaucoma is not painful. A sudden painful red eye with nausea and halos around lights can represent acute angle closure, which is an emergency. That presentation should be evaluated urgently.
Questions that improve your understanding
These clarify diagnosis, target pressure, and what is being monitored.
- What is my diagnosis category: suspect, ocular hypertension, or glaucoma, and what findings support it?
- What is my target pressure and why was it chosen?
- Which tests will be tracked over time, and what rate of change would trigger a plan change?
- How often do you recommend OCT and visual fields in my stage and risk profile?
- If drops are recommended, what are the common side effects and what should trigger a call?