What intraocular pressure reading would most likely indicate open-angle glaucoma?

Open-angle glaucoma is characterized by an increase in intraocular pressure (IOP) that often exceeds normal levels, which is typically around 10 to 21 mm Hg. Elevated IOP is a significant risk factor in the pathophysiology of glaucoma, as it can lead to damage of the optic nerve and progressive loss of vision.

The reading of 28 mm Hg falls well above the upper limit of normal and is consistent with the type of IOP elevation commonly seen in open-angle glaucoma. In most cases of open-angle glaucoma, patients may not experience symptoms until significant damage to vision occurs, and regularly measuring IOP is crucial for early detection and management of the disease.

In contrast, the other readings provided are lower than what is generally associated with open-angle glaucoma. An 8 mm Hg reading is notably low and unlikely to indicate glaucoma, while a 14 mm Hg reading is within the normal range. Although a 20 mm Hg reading is approaching a level that could warrant further investigation, it is still often considered borderline or within acceptable limits for many individuals. Therefore, a reading of 28 mm Hg is the most indicative of potential open-angle glaucoma, necessitating further evaluation and possibly treatment.