id	keyword
american_scientific_journal-1558	eye
american_scientific_journal-1558	students
american_scientific_journal-1558	defects
american_scientific_journal-1558	medical
american_scientific_journal-1558	myopia
american_scientific_journal-1558	astigmatism
american_scientific_journal-1558	vision
american_scientific_journal-1558	vol
american_scientific_journal-1558	prevalence