rerepoer: the studies ee uneqeqvocal.hat'seeded d are fewe teher-lelelessons, more brea, anand more natural light wu: ouourecent eerimentsitith chicicns and mkeys hav early shn that rular daight c c reduce myopia i ildreneny 30% a year. rerterer: eryone aees in the stf roroomtoo. it the parents that are the principas biggesest problem. huanang: they keepep telling met there are nono grades for r ig able to see well. it's examshehey care aboutut. ththey say it's s more importatr their chilildren to do w welln those than it is for them to be ablele to see. khan, meanwhile, is s breaking more tababoos by suggegestinge children learn less. russ: every half hour we gee our r eyes breakak. r how lolo? >> 10 minunutes. russ: and hohow long do yoyou e to plalay outside eaeach day, e vevery lst? >>>> two hours. reporter: : it's somethihing maf their pants would rather not adt,t, but m khan is tir ildren's ideal teacher. a a real pson,n, talng frorohis n experice, instd of livering conventnal leon. huang:e's a ve special person. re