## **Core Concept**
Diabetic retinopathy is a complication of diabetes characterized by damage to the blood vessels of the retina. Pericytes play a crucial role in the maintenance of the blood-retinal barrier and regulation of blood flow.

## **Why the Correct Answer is Right**
In diabetic retinopathy, one of the earliest changes is the loss of pericytes from the retinal capillaries. This loss of pericytes leads to weakening of the capillary walls, making them more susceptible to damage and leakage. The correct answer indicates a decrease in the number of pericytes.

## **Why Each Wrong Option is Incorrect**
- **Option A:** An increase in pericytes is not a characteristic feature of diabetic retinopathy; instead, pericyte loss is observed.
- **Option B:** This option might suggest a minimal change or no change, which does not accurately reflect the known pathology of diabetic retinopathy.
- **Option D:** This option suggests no change or a different kind of change not related to the decrease observed in diabetic retinopathy.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the loss of pericytes in diabetic retinopathy contributes to the formation of microaneurysms and increased vascular permeability. Early detection and management of diabetic retinopathy are critical to prevent vision loss.

## **Correct Answer:** . Decreased