title: Spectacle-use, bifocals and prevention of myopic progression. The two-years results of a randomized trial among schoolchildren.
abstract: This paper gives the two-year follow-up results of a randomized trial of three different types of corrective lenses: 1) minus lenses with full correction for continuous use (the Reference group); 2) minus lenses with full correction to be used for distant vision only; and 3) bifocal lenses. A total of 240 9-11-years old mildly myopic schoolchildren were randomly allocated to the three different treatment groups to be followed up for 3 years. After 2-years follow-up the change in the spherical equivalent was greatest in the distant use group. There were no significant positive correlations between changes in refraction and accommodation or refraction and convergence.
authors.forename: O
authors.initials: O
authors.lastname: Pärssinen
authors.forename: E
authors.initials: E
authors.lastname: Hemminki
mesh_terms: D000065:Accommodation, Ocular; D002648:Child; D002986:Clinical Trials as Topic; D003290:Convergence, Ocular; D005139:Eyeglasses; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D009216:Myopia / Q000517:prevention & control*; D011897:Random Allocation; D012029:Refraction, Ocular