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Related Experiment Videos

Longitudinal changes in corneal asphericity in myopia.

D G Horner1, P S Soni, N Vyas

  • 1Indiana University School of Optometry, Borish Center for Ophthalmic Research, Bloomington 47405-3680, USA. hornerdg@indiana.edu

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|May 5, 2000
PubMed
Summary

Adolescent myopia progression correlates with changes in corneal shape. Specifically, increasing myopia is associated with a more oblate peripheral cornea (positive Q value), indicating a significant relationship between corneal asphericity and myopia development.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Physiology

Background:

  • Myopia progression in adolescents is a significant public health concern.
  • Understanding factors influencing myopia progression is crucial for developing effective interventions.
  • The role of peripheral corneal shape in myopia development requires further investigation.

Purpose of the Study:

  • To investigate the relationship between peripheral corneal asphericity (Q) and myopia progression in adolescents.
  • To determine if changes in corneal shape contribute to the increase in myopia during adolescence.

Main Methods:

  • Longitudinal study of 48 subjects aged 11-13 years over 5 years.
  • Subjects had prior experience with soft contact lenses.
  • Corneal shape parameters, including asphericity (Q), were analyzed in relation to refractive error changes.

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Main Results:

  • Myopia increased by an average of 1.46 D, strongly correlated with a 0.56-mm increase in axial length.
  • No significant change in central corneal radius was observed.
  • A significant correlation (p < 0.01) was found between peripheral corneal asphericity (Q) and myopia progression, with a slope of -0.04 Q per diopter.

Conclusions:

  • Increased myopia in adolescents is associated with a shift towards a more positive Q value, indicating a more oblate peripheral cornea.
  • Peripheral corneal shape changes are linked to myopia progression in this adolescent cohort.