If I keep my eyes closed, I see a yellow scallop pattern in a completely black field. Why is that?

It's important to note that any new or unusual visual symptoms, especially if you have a medical condition like diabetes, should be taken seriously and evaluated by a healthcare professional, preferably an ophthalmologist. While I can't diagnose your condition, I can offer some insights into potential causes:

1. Diabetic Retinopathy: Diabetes can lead to a condition called diabetic retinopathy, which can cause various visual symptoms, including floaters, flashes of light, and changes in vision. It's possible that the scalloped pattern of light you're experiencing could be related to this condition.

2. Retinal Detachment: Flashing lights and floaters can also be symptoms of a retinal detachment, a serious eye condition that requires immediate medical attention. However, the scalloped pattern you describe may not be a typical symptom of retinal detachment.

3. Migraine with Aura: Sometimes, visual disturbances like flashing lights and unusual patterns can be associated with migraine headaches, especially if they are followed by mild eye pain. However, the pattern you describe doesn't sound like a typical migraine aura.

Don't delay in seeking medical care, as early intervention can be crucial in managing eye-related issues, particularly in individuals with diabetes. Good luck!