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Retinal arteriolar narrowing is shown in (a). Retinal arteriolar caliber listed in the image on top has narrower (132 μm) than the image in the bottom (151 μm). Retinal venular widening is shown in (b). Retinal venular caliber listed in the image on top has wider (171.8 μm) than the image in the bottom (156.3 μm).
