Diabetes itself was not the issue, but really high blood sugar. But even on diabetes medication, my blood sugar is higher than those who don't have diabetes. So, from my experience only, diabetes is a factor.

I looked up an article that agrees with that <

Snippet:
High blood sugar can lead to problems like blurry vision, cataracts, glaucoma, and retinopathy. In fact, diabetes is the primary cause of blindness in adults ages 20 to 74.

http://www.webmd.com/eye-health/eye-problems#1