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Changes in refractive error for exotropes treated with overminus lenses.

R P Rutstein1, W Marsh-Tootle, R London

  • 1School of Optometry Medical Center, University of Alabama, Birmingham.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 1, 1989
PubMed
Summary

Overminus lenses prescribed for pediatric exotropia showed a small correlation between initial refractive error and myopia progression. Other treatment factors had minimal impact on refractive changes.

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Area of Science:

  • Ophthalmology
  • Pediatric Optometry
  • Vision Science

Background:

  • Exotropia is a common outward turning eye misalignment in children.
  • Overminus lenses are sometimes used in exotropia management, but their effect on refractive error is not fully understood.
  • Understanding refractive changes is crucial for long-term visual health in pediatric patients.

Purpose of the Study:

  • To evaluate refractive changes in pediatric patients treated with overminus lenses for exotropia.
  • To determine if initial refractive error or treatment parameters influence myopic progression.
  • To compare refractive changes in hyperopic, emmetropic, and myopic children with exotropia.

Main Methods:

  • Retrospective analysis of 40 pediatric exotropia patients (ages 1-15).

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  • Patients were prescribed overminus lenses ranging from -0.50 D to -3.75 D.
  • Refractive error changes were monitored over 9 to 86 months.

    • Main Results:

    • A small but significant correlation was observed between initial refractive error and the annual myopic shift.
    • Age at treatment, therapy duration, overminus amount, and exodeviation magnitude had minimal effect on myopic progression.
    • Mean annual refractive changes were comparable to those reported for non-exotropic children across refractive groups.

    Conclusions:

    • Initial refractive error is a minor factor in myopia progression with overminus lens therapy for exotropia.
    • Overminus lens therapy for exotropia does not appear to significantly accelerate myopic changes compared to general pediatric populations.
    • Further research may be needed to optimize overminus lens prescription for exotropia management.