Both dark and milk chocolate improve visual acuity, but dark chocolate improves it more

In June 2018 researchers from the USA published the results of their study to assess the short-term effects of dark chocolate and milk chocolate on visual acuity and contrast sensitivity.  Thirty participants, average age 26 years, with no eye disease each consumed a dark and milk chocolate bar in separate sessions, with visual acuity and large- and small-letter contrast sensitivity being measured 1.75 hours after each consumption. Results showed that both dark and milk chocolate improved visual acuity and contrast sensitivity. However, when a comparison was made between dark and milk chocolate consumption, dark chocolate was significantly better at improving small-letter contrast sensitivity but only slightly better at improving large-letter contrast sensitivity.

Rabin JC et al. Effects of Milk vs Dark Chocolate Consumption on Visual Acuity and Contrast Sensitivity Within 2 Hours: A Randomized Clinical Trial.  JAMA Ophthalmol. 2018 Jun 1;136(6):678-681

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