Silver Book Fact
After 9 years of tight blood pressure control, patients with type 2 diabetes had a 34% reduction in retinopathy progression and a 47% reduction in risk of visual acuity deterioration by three lines, when they had a 10/5 mmHg reduction in blood pressure.
Turner R, Holman R, Stratton I, Cull C, et al. Tight Blood Pressure Control and Risk of Macrovascular and Microvascular Complications in Type 2 Diabetes. BMJ. 1998; 317(7160): 703-13. http://www.bmj.com/cgi/content/abstract/317/7160/703