<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing diminished vision, paresthesia, nausea, and fatigue. What could be causing these symptoms?  <response>: Based on your symptoms, it is possible that you have Von Hippel-Lindau disease. This is a genetic disorder that can cause tumors to form in various parts of the body, including the brain, spinal cord, and eyes. These tumors can lead to a range of symptoms, including vision problems and neurological issues such as paresthesia. Nausea and fatigue can also be associated with the disease. 