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.