The linked study doesn't agree that "that is a misconception and has been debunked". It says it's true:
> As indicated by other reports, myopia was found to be associated with ... education and nearwork.
> As indicated by other reports, myopia was found to be associated with ... education and nearwork.
> ...for many years there was an assumption that long hours of study indoors, staring closely at books (near work) and never focusing on distant objects, led to myopia. This study belied that error.
http://sunlightinstitute.org/research-shows-sun-exposure-red...
> ...increased load of near work was not significantly associated with odds of myopia when factors including parental myopia, demographics, and outdoor activities were adjusted for.