**Core Concept**
Purtscher retinopathy is a rare condition characterized by sudden vision loss following a traumatic event, often resulting from a severe head injury or crush injury. It is a form of traumatic retinopathy that involves the retina and is associated with a characteristic fundoscopic appearance.

**Why the Correct Answer is Right**
Purtscher retinopathy is thought to be caused by the release of inflammatory mediators and the activation of the complement system following the traumatic event. This leads to the deposition of immune complexes in the retinal layers, causing damage to the retinal pigment epithelium and photoreceptors. The condition is often accompanied by other systemic symptoms, such as shock, hypotension, and metabolic acidosis.

**Why Each Wrong Option is Incorrect**
* **Option A:** While retinal detachment can cause vision loss, it is not directly associated with Purtscher retinopathy.
* **Option B:** Diabetic retinopathy is a common cause of vision loss in diabetic patients, but it is not related to traumatic events.
* **Option C:** Age-related macular degeneration is a leading cause of vision loss in older adults, but it is not associated with Purtscher retinopathy.

**Clinical Pearl / High-Yield Fact**
Purtscher retinopathy is often accompanied by other systemic symptoms, such as shock, hypotension, and metabolic acidosis, which can help diagnose the condition. A high index of suspicion is necessary, especially in patients with a history of traumatic events.

**Correct Answer: C. Crush injury.