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Spectacle‐use, bifocals and prevention of myopic progression: The two‐years results of a randomized trial among schoolchildren
Author(s) -
Pärssinen Olavi,
Hemminki Elina
Publication year - 1988
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1988.tb02698.x
Subject(s) - randomized controlled trial , medicine , refraction , accommodation , optometry , ophthalmology , surgery , optics , physics
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 postive correlations between changes in refraction and accommodation or refraction and convergence.