- Design
- Cross-sectional observational study
- Population
- 75 patients with primary open-angle glaucoma
- Primary outcome
- Association of ocular perfusion pressure and intraocular pressure with glaucoma severity
- Effect
- Perfusion pressure fell with severity (P < 0.001); intraocular pressure did not differ (P = 0.71)
Intraocular pressure is the one modifiable glaucoma risk factor we routinely treat, but it does not explain every case that progresses. This cross-sectional Indian study of 75 eyes with primary open-angle glaucoma examined ocular perfusion pressure — the gap between blood pressure and intraocular pressure that drives optic nerve blood supply.
Mean intraocular pressure did not differ across early, moderate and advanced disease, yet ocular perfusion pressure, diastolic perfusion pressure, diastolic blood pressure and mean arterial pressure all fell significantly with increasing severity. Patients on antihypertensive medication had lower perfusion pressure than those not on it, despite similar in-office systolic blood pressure.
The signal is that perfusion, not just pressure, may matter in glaucoma that worsens on apparently controlled intraocular pressure. It is worth asking about blood pressure medication and nocturnal dipping in a progressing patient. This is a small cross-sectional study, so it raises the question rather than settling management.
- Cross-sectional study of 75 eyes with primary open-angle glaucoma in India.
- Intraocular pressure did not differ across disease stages (P = 0.71).
- Ocular perfusion, diastolic perfusion, diastolic and mean arterial pressure all fell with greater severity (P < 0.001).
- Patients on antihypertensives had lower perfusion pressure despite similar clinic systolic blood pressure.
- In glaucoma progressing on controlled intraocular pressure, review blood pressure treatment and nocturnal dipping.
Why it matters
It offers an explanation and a thing to check when glaucoma progresses even though the intraocular pressure looks well controlled.
Don't overread it
Cross-sectional with a single blood-pressure reading; it cannot show causation or that adjusting antihypertensives changes glaucoma outcomes.
The statistics, in plain English
That severity tracked with perfusion pressure but not intraocular pressure points to a perfusion contribution; as a single-timepoint cross-sectional study it shows association, not that raising perfusion pressure helps.
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