Changes in refractive error in patients with accommodative esotropia after being weaned from hyperopic correction

초록

Background To determine the long-term changes in refractive error and ocular alignment in patients with accommodative esotropia (AET) who were able to discontinue wearing hyperopic glasses because of emmetropisation. Methods Forty-seven patients with refractive AET who achieved emmetropisation and orthotropia without hyperopic glasses and were followed up for at least 3 years were enrolled. All of the patients had been prescribed the weakest possible glasses for best corrected vision. Refractive error and ocular alignment were analysed after the cessation of hyperopic glasses use. Results The mean length of follow-up was 5.7 +/- 3.21 years after successful weaning from hyperoptic glasses. The mean spherical equivalent (SE) of the refractive error was -1.01 +/- 1.53 dioptres (D), and the mean esotropia (ET) was 1.0 +/- 8.70 Delta at the final visit. Myopia developed in 55.3% of all patients. The mean myopic progression rate per year was -0.19 +/- 0.23 D/year. Forty-one patients (87.2%) showed orthotropia; in addition, three of the patients (6.4%) developed ET, and three (6.4%) developed exotropia (XT). The six patients who had ET or XT all showed myopia. Two of the three patients who developed ET underwent surgery. Both patients initially had a low degree of hyperopia and a high ratio of accommodative convergence to accommodation (AC/A). The initial hyperopia correlated with the SE refractive error at the final follow-up (p<0.001). Conclusions When emmetropisation occurs early in patients with AET, it is necessary to note the development of myopia and the deterioration of ocular alignment.

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