**Core Concept**
Diabetic retinopathy is a common complication of diabetes mellitus, particularly in non-insulin-dependent diabetes mellitus (NIDDM), also known as type 2 diabetes. Fundus examination is a crucial diagnostic tool to detect and monitor diabetic retinopathy.

**Why the Correct Answer is Right**
In NIDDM, patients are at a higher risk of developing diabetic retinopathy due to prolonged exposure to hyperglycemia. Fundus examination helps to detect microvascular changes, such as microaneurysms, hemorrhages, and hard exudates, which are early signs of diabetic retinopathy. The examination typically involves a dilated pupil and a direct ophthalmoscope to visualize the retina.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because fundus examination is not typically performed in NIDDM patients without any symptoms or risk factors.
**Option B:** This option is incorrect because while blood glucose monitoring is essential in NIDDM management, it does not replace fundus examination in detecting diabetic retinopathy.
**Option C:** This option is incorrect because while blood pressure monitoring is crucial in NIDDM management, it does not replace fundus examination in detecting diabetic retinopathy.

**Clinical Pearl / High-Yield Fact**
It is essential to screen NIDDM patients for diabetic retinopathy annually, starting 5 years after the diagnosis, to detect and treat the condition promptly and prevent vision loss.

**Correct Answer: D. Annual fundus examination is recommended for NIDDM patients starting 5 years after the diagnosis.**