In a 58-year-old patient with hypertension who presents with a sharply demarcated bright red patch on the nasal conjunctiva without pain, photophobia, discharge, or visual changes, what is the most likely diagnosis?

Subconjunctival Hemorrhage

The most likely diagnosis is B. Subconjunctival hemorrhage - a sharply demarcated bright-red patch on the conjunctiva without pain, photophobia, discharge, or visual changes is pathognomonic for this benign condition.

Clinical Reasoning

The clinical presentation eliminates the other diagnoses systematically:

• Scleritis (A) presents with severe, boring ocular pain that radiates to the face and head, often worsening at night. The eye appears violaceous rather than bright red, and patients typically have photophobia and decreased vision - none of which are present here.

• Acute glaucoma (C) manifests with severe eye pain, headache, nausea/vomiting, decreased vision, and a mid-dilated fixed pupil. The cornea appears hazy/cloudy, not a bright red conjunctival patch.

• Keratitis (D) causes pain, photophobia, decreased vision, and discharge - all explicitly absent in this patient.

Subconjunctival Hemorrhage: Key Features

Characteristic presentation:

• Sharply demarcated, bright-red patch on bulbar conjunctiva
• Completely asymptomatic (no pain, no visual changes)
• No discharge or photophobia
• Benign and self-limiting

Critical Association with Hypertension

This patient requires blood pressure measurement. The hypertensive history is highly relevant - studies demonstrate that 46% of patients presenting with subconjunctival hemorrhage have hypertension by WHO criteria (systolic BP >160 and/or diastolic BP >95) compared to only 23% of controls 1. Blood pressure is significantly elevated in subconjunctival hemorrhage patients (mean 149/89 vs 142/81 in controls) 1.

Among elderly patients specifically, systemic vascular diseases including hypertension are the most common risk factors for subconjunctival hemorrhage 2. Blood pressure examination is particularly important in older patients with this condition 3.

Management Approach

Immediate actions:

1. Check blood pressure - this is the single most important intervention given the patient's hypertensive history
2. Reassure the patient - this is a benign condition
3. Explain natural history - resolves spontaneously in 1-2 weeks as blood reabsorbs

When to investigate further:

• Recurrent episodes warrant evaluation for bleeding disorders, anticoagulant use, or systemic malignancies 2
• Extensive hemorrhage (involving multiple conjunctival quadrants) suggests more severe hypertension or coagulopathy 4

No treatment is required - the hemorrhage resolves spontaneously without intervention. Artificial tears may provide comfort if mild irritation is present.

Common Pitfalls

Do not:

• Prescribe antibiotics - there is no infection
• Order extensive coagulation workup for a first episode in a known hypertensive
• Refer to ophthalmology unless recurrent or associated with trauma suggesting globe rupture

Do:

• Document blood pressure at presentation
• Ensure hypertension is adequately controlled if elevated
• Advise patient to avoid Valsalva maneuvers, heavy lifting, and aspirin/NSAIDs temporarily

The answer is B. Subconjunctival hemorrhage 1, 2, 3.