Contrast sensitivity and visual acuity were significantly higher 2 hours after consumption of a dark chocolate bar compared with a milk chocolate bar, but the duration of these effects and their influence in real-world performance await further testing.
Rabin JC, Karunathilake N, Patrizi K. Effects of Milk vs Dark Chocolate Consumption on Visual Acuity and Contrast Sensitivity Within 2 HoursA Randomized Clinical Trial. JAMA Ophthalmol. Published online April 26, 2018. doi:10.1001/jamaophthalmol.2018.0978
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