Diabetic retinopathy is a serious complication of type 2 diabetes resulting from a drop-off in blood supply to the patient's retina.

Sixty-six percent were aware of cataracts; 63 percent, glaucoma; 50 percent, macular degeneration; and 37 percent, diabetic retinopathy.

While the study couldn't prove a cause-and-effect relationship, researchers say a "couch potato" lifestyle does seem to raise the risk for diabetic retinopathy.