This study evaluates the effect of sildenafil on choroidal vascular congestion and its correlation with visual effects. Thirteen healthy subjects were randomized to a sildenafil group (n = 7, 3 M, 4 F), who received 200 mg of sildenafil, and a control (n = 6, 5 F, 1 M) group, who received no drug. Measurements of choroidal thickness with ultrasonography, color vision with Desaturated Panel D-15 Test, and contrast sensitivity with CSV-1000e charts (Vector Vision) were performed at baseline and at 90 and 180 min.
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