“Forget Carrots, Study Finds Dark Chocolate Can Improve Vision,” “A Bit of Dark Chocolate Might Sweeten Your Vision,” and “Dark Chocolate Linked to Enhanced Visual Acuity”: these are just a few of the online headlines that appeared online after JAMA Ophthalmology published an article by Rabin and colleagues1 reporting a small randomized clinical trial on the short-term effects of milk chocolate vs dark chocolate on visual acuity and contrast sensitivity in healthy human volunteers.1 Now, just about a year later, JAMA Ophthalmology is publishing a similar-sized study from Siedlecki and colleagues2 using nearly the same methods along with objective imaging methods that reports that they could not replicate the positive contrast sensitivity results of the previous article. Undoubtedly, there will be another round of online posts saying that dark chocolate does not improve vision and the general public will be left confused as to whether an easy and pleasant nutritional intervention is good for their eyes.
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Bernstein PS. Does Dark Chocolate Enhance Visual Function? JAMA Ophthalmol. Published online September 26, 2019. doi:10.1001/jamaophthalmol.2019.3740
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