**Core Concept**
The question is testing the student's knowledge of the indications and contraindications for certain diagnostic procedures in the eye, specifically in relation to the presence of a dilated pupil.

**Why the Correct Answer is Right**
A dilated pupil can be a contraindication for certain diagnostic procedures, such as tonometry, as the increased pupil size can lead to inaccurate readings. This is because tonometry relies on the indentation of the cornea to measure intraocular pressure, and a dilated pupil can prevent this indentation from occurring.

**Why Each Wrong Option is Incorrect**
* **Option A:** is not necessarily incorrect, as some diagnostic procedures may not be affected by a dilated pupil. However, it is not the best choice as it does not directly address the question.
* **Option B:** is a correct procedure that can be done in a dilated pupil, as it does not rely on the size of the pupil to function.
* **Option C:** is a correct procedure that can be done in a dilated pupil, as it does not rely on the size of the pupil to function.
* **Option D:** is a correct procedure that can be done in a dilated pupil, as it does not rely on the size of the pupil to function.

**Clinical Pearl / High-Yield Fact**
It's essential to note that a dilated pupil can be a contraindication for tonometry, and the procedure should be avoided in such cases. This is a common exam trap, and students should be aware of the specific contraindications for each diagnostic procedure.

**Correct Answer: D. Fundus examination**