**Core Concept**
Central Retinal Venous Occlusion (CRVO) and Ocular Ischemic Syndrome (OIS) are two distinct clinical entities that can present with similar symptoms, including retinal edema and vision loss. CRVO occurs when the central retinal vein is occluded, leading to venous stasis and retinal edema. OIS, on the other hand, is a complication of carotid artery obstruction, leading to retinal ischemia and infarction.

**Why the Correct Answer is Right**
CRVO is typically characterized by the presence of retinal venous dilatation, retinal hemorrhages, and retinal edema, whereas OIS is characterized by retinal ischemia, optic disc edema, and a pale optic disc. The presence of retinal venous dilatation and retinal hemorrhages is more indicative of CRVO, whereas the presence of retinal ischemia and a pale optic disc is more indicative of OIS. This is due to the different underlying pathophysiological mechanisms of the two conditions.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because retinal venous dilatation is a characteristic feature of CRVO, making it a useful differentiating feature.
**Option C:** This option is incorrect because the presence of retinal hemorrhages is a characteristic feature of CRVO, making it a useful differentiating feature.

**Clinical Pearl / High-Yield Fact**
A key differentiating feature between CRVO and OIS is the presence of retinal venous dilatation and retinal hemorrhages in CRVO, which is not typically seen in OIS. This is due to the different underlying pathophysiological mechanisms of the two conditions.

**Correct Answer: D.**