My 10 Yr Old Grandchild Says He Has Times Where

My 10 yr old grandchild says he has times where he feels faint, everything turns blue, and he sees fuzzy dots. It lasts less than a minute and it accompanies a headache and nausea. He says he has the episodes once a day at any time, at school, at play or watching tv. Do you know what it could be? Randy Erickson