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Related Experiment Videos

Can bifocals slow myopia progression?

G W Fulk1, L A Cyert

  • 1College of Optometry, Tahlequah, OK 74464, USA.

Journal of the American Optometric Association
|December 1, 1996
PubMed
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Bifocal lenses may slow myopia progression in children with esophoria. Myopia worsened faster during school months than summer vacation, suggesting environmental factors influence progression.

Area of Science:

  • Ophthalmology
  • Pediatric Optometry

Background:

  • Retrospective studies suggest bifocals slow myopia progression in children with near point esophoria.
  • A prospective study was designed to validate this hypothesis.

Purpose of the Study:

  • To investigate the efficacy of bifocal lenses in slowing myopia progression in children with near point esophoria.
  • To compare myopia progression rates between single-vision and bifocal lens corrections.

Main Methods:

  • Thirty-two children with near point esophoria were randomized into single-vision or bifocal (+1.25 D) lens groups.
  • Axial length and refraction were measured every six months for 18 months.
  • Twenty-eight children completed the study.

Main Results:

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  • Myopia progression was similar in both groups for the first 12 months.
  • Progression was significantly faster during school months (0.64 D/yr) compared to summer vacation (0.29 D/yr).
  • Over 18 months, myopia progressed at 0.57 D/yr with single-vision lenses and 0.39 D/yr with bifocals.

Conclusions:

  • Bifocal lenses showed a trend towards slowing myopia progression in this cohort.
  • Seasonal variations significantly impacted myopia progression rates, with faster progression during the school year.
  • Further long-term studies with larger sample sizes are required to confirm these findings.