A 68-year-old man with a long history of smoking, hypertension, and diabetes presents with progressive visual blurring and episodes of amaurosis fugax in the right eye. Fundoscopy reveals attenuated retinal arterioles, dilated but non-tortuous venules, and scattered hemorrhages in the mid-periphery outside the arcades. The structure marked **B** (mid-peripheral dot-blot hemorrhages) is noted. Which of the following clinical findings would BEST distinguish this presentation from central retinal vein occlusion (CRVO)?