**Core Concept**
Screening for Diabetic Retinopathy is crucial for early detection and prevention of vision loss in patients with diabetes. The American Diabetes Association recommends regular eye examinations to identify diabetic retinopathy in patients with diabetes, particularly those with a duration of diabetes greater than 5 years.

**Why the Correct Answer is Right**
The correct answer is based on the American Diabetes Association's guidelines, which recommend screening for diabetic retinopathy in patients with diabetes at the time of diagnosis and annually thereafter. This is because diabetic retinopathy can occur at any time during the course of diabetes, and early detection is essential to prevent vision loss. The presence of diabetic retinopathy can be asymptomatic, making regular screening critical.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because screening at the time of diagnosis is not sufficient, as diabetic retinopathy can develop over time and may not be detectable at the initial screening.
**Option B:** This option is incorrect because there is no specific duration after which screening is recommended; rather, it's an ongoing process throughout the course of diabetes.
**Option C:** This option is incorrect because screening is not limited to patients with type 1 diabetes; patients with type 2 diabetes also require regular screening for diabetic retinopathy.

**Clinical Pearl / High-Yield Fact**
Patients with diabetes are at increased risk of developing diabetic retinopathy, and regular screening can prevent vision loss. The 7-point scale is used to classify the severity of diabetic retinopathy, ranging from no disease to severe non-proliferative diabetic retinopathy.

**Correct Answer: B. 1 year after diagnosis.**