**Core Concept**
Papilloedema is the swelling of the optic disc due to increased intracranial pressure, which can be caused by various conditions such as tumors, hemorrhages, or hydrocephalus. It is characterized by the enlargement of the optic disc, which can lead to vision disturbances and even blindness if left untreated.

**Why the Correct Answer is Right**
Papilloedema is typically characterized by the following features:
- Enlargement of the optic disc (papilledema)
- Blurring of the optic disc margins
- Swelling of the retinal nerve fiber layer
- Absence of retinal hemorrhages or exudates
- Presence of peripapillary retinal hemorrhages is not typical but can be seen

**Why Each Wrong Option is Incorrect**
**Option A:** The presence of retinal hemorrhages or exudates is not a characteristic feature of papilloedema, as these are more commonly associated with other conditions such as diabetic retinopathy or hypertensive retinopathy.

**Option B:** While the optic disc may appear flat in some cases of papilloedema, particularly in the early stages, this is not a characteristic feature that distinguishes it from other conditions.

**Option C:** The absence of vision disturbances is not a characteristic feature of papilloedema, as patients with papilloedema often experience visual field defects, blurred vision, or even loss of vision.

**Clinical Pearl / High-Yield Fact**
Remember that papilloedema can be a sign of increased intracranial pressure, so it's essential to investigate and manage the underlying cause promptly to prevent further complications.

**Correct Answer: A. The presence of retinal hemorrhages or exudates is not a characteristic feature of papilloedema.**