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The study is published in the
"Food & Function". Thirty-four adults took part in a
of experiments over 16 weeks. Half of the
ate one-and-a-half cups of grapes per
; the other half ate a placebo
. Dr Kim did not tell the participants or the researchers whether she was testing the grapes or the snack. She thought that not revealing this
would give better test results. She found that people who ate the grapes had improved
strength around the retina. The retina passes information about
to the brain via electrical signals. It protects the eyes from damaging blue
. A lot of blue light comes from computer and smartphone
, and from LED lights.
