What an Eye Exam Can Find: Diabetes, High Blood Pressure — Even a Brain Tumor comprehensive eye exam · diabetic retinopathy · early detection · high blood pressure · OCT · optic nerve · retinal imaging · Aug 16, 2023 The back of the eye is the only place a doctor can look straight at blood vessels and nerve tissue without a scan or an incision. That is why an eye exam sometimes finds health problems before you feel a thing.