California man Mike May made international headlines in 2000 when his sight was restored by a pioneering stem cell procedure after 40 years of blindness…. . But in a paper now available online in Psychological Science, they report that May -- referred to in the study as M.M. -- continues to perform significantly worse than sighted control group participants. The conclusion: May's vision remains very limited 15 years after the surgeries. Though disappointing, the results provide valuable information that can help researchers better understand how vision develops and which visual processing tasks are most vulnerable to sight deprivation. … Other co-authors … Alyssa Brewer at the University of California, Irvine.

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