**Core Concept**
The question tests knowledge of vitamin toxicity, specifically the adverse effects of high doses of certain vitamins on the eye. **Vitamin A** and its derivatives are known to have significant effects on the visual system.

**Why the Correct Answer is Right**
Although the correct answer is not specified, **Vitamin A** toxicity can cause various ocular issues, but another vitamin is more directly associated with macular oedema and cysts when taken in high doses. **Vitamin C** and other antioxidants are generally considered safe, but **Vitamin A**'s cousin, **Vitamin A derivatives**, are not typically the primary concern for macular oedema in the context of supplement overdose. However, considering common vitamin toxicities, **Vitamin A** is known for its role in vision but is not typically the answer in this context.

**Why Each Wrong Option is Incorrect**
**Option A:** Without specific details, it's hard to assess, but assuming common vitamins, each has its toxicity profile.
**Option B:** Similarly, lacking specifics, we must consider the known effects of vitamins.
**Option C:** If this option were **Vitamin A**, it might seem plausible due to its role in vision, but the question hints at a less obvious answer.
**Option D:** Assuming this could be a vitamin not directly related to vision like **Vitamin E** or **Vitamin K**, these are less commonly associated with macular effects.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that certain vitamins, when taken in excess, can have detrimental effects on the body, including the eyes. Specifically, **Vitamin A** and its derivatives have well-documented ocular side effects, but in the context of macular oedema and cysts due to high doses, considering the typical vitamins and their known toxicities is crucial.

**Correct Answer:** D. Can't be determined without the answer choices.