<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing a foreign body sensation in my eye. It feels like there is something in it, but I cant seem to find anything. What could be causing this?  <response>: It sounds like you may be experiencing diabetic retinopathy. This is a complication of diabetes that affects the blood vessels in the retina of the eye, which can cause a foreign body sensation among other symptoms. We should schedule an eye exam as soon as possible to confirm the diagnosis and begin treatment. 