**Question:** All are ocular emergency except:

A. Conjunctivitis
B. Glaucoma
C. Cataract
D. Retinopathy

**Core Concept:** Ocular emergencies are medical conditions that require immediate attention to preserve vision and eye health. They are usually caused by various ocular pathologies, such as infections, inflammation, trauma, or disorders affecting the retina and optic nerve.

**Why the Correct Answer is Right:** Cataract (C) is not an ocular emergency because it is a common age-related condition that gradually worsens vision but does not pose an immediate threat to the eye or vision. Cataract surgery is often performed to restore vision, but it does not require emergency intervention.

**Why Each Wrong Option is Incorrect:**

A. Conjunctivitis (A) can be an ocular emergency, depending on the cause (e.g., bacterial, viral, or allergic). It can lead to redness, pain, discharge, and visual disturbances if not promptly treated.

B. Glaucoma (B) can be an ocular emergency due to its potential to cause irreversible optic nerve damage and visual field loss. Untreated glaucoma can lead to blindness.

C. Cataract (C): The correct answer
D. Retinopathy (D): The correct answer

**Clinical Pearl / High-Yield Fact:** Ocular emergencies require prompt evaluation and treatment to prevent severe vision loss or blindness. Understanding the nuances between benign conditions like cataract and potentially life-threatening conditions like glaucoma is crucial for timely management. Always consider the potential severity of the condition when assessing an ocular emergency.