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Thirty-four  adultsbetterbluedayinformationmusclescreenssnacktestsweeks took part in experiments over 16  adultsbetterbluedayinformationmusclescreenssnacktestsweeks. Half of them ate one-and-a-half cups of grapes every  adultsbetterbluedayinformationmusclescreenssnacktestsweeks; the other half ate a placebo  adultsbetterbluedayinformationmusclescreenssnacktestsweeks. The participants and the researchers did not know if the  adultsbetterbluedayinformationmusclescreenssnacktestsweeks were on the grapes or the snack. This gave  adultsbetterbluedayinformationmusclescreenssnacktestsweeks test results. Researchers found that people who ate the grapes had better  adultsbetterbluedayinformationmusclescreenssnacktestsweeks strength around the retina. The retina passes  adultsbetterbluedayinformationmusclescreenssnacktestsweeks about light to the brain. It protects the eyes from damaging  adultsbetterbluedayinformationmusclescreenssnacktestsweeks light. A lot of blue light comes from computer  adultsbetterbluedayinformationmusclescreenssnacktestsweeks and LED lights.