Yes, diabetes patient might have watery eyes. Actually diabetes is the leading cause to blindness today which affect people aged from 20-74. Diabetes patients have problem to produce a kind of insulin, which could transfer glucose to power for our body. Hence the glucose builds up in blood. High blood sugar will definitely increase the risk of eye problem. There are three kinds of complications of eyes caused by diabetes. 1. Cataract. With cataract, you would have cloudy or foggy vision. Many people, especially old people, get cataract, but people with diabetes would develop this condition at an earlier age with faster progress. 2. Glaucoma. This is another dangerous eye problem caused by diabetes. The high pressure in eyes can kill nerve cells and blood vessels in eyes, which finally lead to blindness. People with glaucoma have watering eyes, yet we can't call the watering eyes a sign of diabetes I think. It is a symptom of a condition that might triggered by diabetes. 3. Retinopathy. This is the vascular complication related to diabetes, and it is the leading cause to blindness without timely and proper treatment. Diabetes can damage many organs in our body. So it is very important to control the blood sugar level.