A nurse is assessing a 68-year-old client diagnosed with primary open-angle glaucoma. Which assessment finding would be most concerning and require immediate intervention?

Sudden severe eye pain with nausea/vomiting indicates acute angle-closure glaucoma, an ophthalmologic emergency requiring immediate intervention to prevent vision loss. Other options describe chronic or mild findings manageable with routine care.

Understanding the Clinical Scenario

The client has a known diagnosis of primary open-angle glaucoma (POAG). This condition is characterized by a chronic, progressive optic neuropathy. The drainage angle of the eye remains open, but the trabecular meshwork gradually becomes less efficient at draining aqueous humor. This leads to a slow, insidious rise in intraocular pressure (IOP), causing gradual peripheral vision loss. The key clinical point is that POAG is typically asymptomatic in its early and moderate stages; it does not cause acute pain.

The question asks for the finding that is most concerning and requires immediate intervention. This directs us to identify a sign or symptom that represents an acute change or a complication distinct from the expected chronic course of POAG.

Analysis of Assessment Findings

1. Complaints of mild eye fatigue after reading for extended periods
This is a nonspecific symptom commonly associated with presbyopia or general eye strain, particularly in a 68-year-old client. While it can be uncomfortable, it is not an emergency and does not indicate an acute glaucomatous process or a threat to vision. It is an expected finding that can be managed with rest and proper lighting, not an immediate intervention.

2. Sudden onset of severe eye pain with nausea and vomiting
This is a classic triad for acute angle-closure glaucoma (AACG). In this emergency, the drainage angle becomes mechanically blocked, often by the iris, causing a sudden and dramatic spike in IOP. The provided evidence supports this as a critical finding. The case report by Moran et al. describes a patient with acute angle-closure glaucoma secondary to vitreous prolapse who presented with "acute left eye pain, nausea, and vision loss" with an IOP of 59 mmHg ^[1]. This presentation is a medical emergency requiring immediate treatment to prevent permanent optic nerve damage and vision loss. In a client with pre-existing POAG, the sudden onset of these symptoms is alarming and suggests a superimposed acute crisis, not an exacerbation of their chronic disease.

3. Gradual decrease in peripheral vision over the past 6 months
This is the hallmark, expected progression of primary open-angle glaucoma. The chronic, elevated IOP damages the optic nerve, leading to a slow, painless loss of peripheral vision, often described as "tunnel vision." While this finding confirms disease progression and requires long-term management adjustments, it is a chronic issue, not an immediate emergency requiring intervention within minutes to hours.

4. Intraocular pressure reading of 22 mmHg on current medication regimen
An IOP of 22 mmHg is above the typical target range (often 10-21 mmHg) and indicates that the current medication regimen is not achieving optimal IOP control. This is a significant finding that necessitates a follow-up appointment with the ophthalmologist to adjust therapy. However, in the context of chronic POAG, this pressure alone does not constitute an immediate, minute-to-minute emergency like an acute angle-closure attack. The risk of rapid, irreversible damage is lower than with the symptom cluster in option 2.

Why the Correct Answer is the Priority

The sudden onset of severe eye pain with nausea and vomiting is the most concerning finding because it is pathognomonic for an acute, vision-threatening crisis superimposed on a chronic condition. The urgency is driven by the pathophysiology: a rapid, extreme elevation in IOP can cause irreversible ischemic damage to the optic nerve and retina within hours. The case report of a patient with an IOP of 59 mmHg presenting with these exact symptoms highlights the severity of such an event ^[1]. This requires immediate nursing action, such as notifying the physician or nurse practitioner emergently, as the definitive treatment involves rapidly lowering the IOP with medications like hyperosmotic agents and topical miotics, followed by laser iridotomy. Delaying this intervention can lead to permanent blindness.