A 48-year-old woman with a 10-year history of controlled hypertension (current BP 160/100 mmHg) presents with asymptomatic blurred vision detected during routine eye screening. Fundoscopy shows microaneurysms, dot-blot hemorrhages, hard exudates in the macula, but NO papilledema. Visual acuity is 6/9 in both eyes. What is the most appropriate next step in management?