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Corneal changes in schoolchildren

N E Friedman1, D O Mutti, K Zadnik

  • 1School of Optometry, University of California at Berkeley, California, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 1, 1996
PubMed
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Corneal flattening continues in children aged 6-14 years, but corneal toricity remains stable. This study analyzed videokeratography data to understand changes in corneal power and toricity over time.

Area of Science:

  • Ophthalmology
  • Pediatric Optometry
  • Corneal Physiology

Background:

  • Myopia progression in children is a significant public health concern.
  • Understanding corneal changes is crucial for myopia management.
  • The Orinda Longitudinal Study of Myopia provides valuable data on childhood eye development.

Purpose of the Study:

  • To analyze videokeratography data from children to quantify corneal power, toricity, and toricity axis.
  • To investigate age-related trends and longitudinal changes in these corneal parameters.
  • To determine the relationship between corneal changes and myopia progression during childhood.

Main Methods:

  • Utilized videokeratography (TMS-1) data from 788 children (ages 6-14).
  • Employed Fast Fourier Transform (FFT) for quantitative analysis of corneal parameters.

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  • Conducted both cross-sectional and longitudinal analyses over a 3-year period.

    • Main Results:

    • Cross-sectional analysis revealed no significant age trend in corneal power, toricity, or axis.
    • Longitudinal analysis showed a statistically significant decrease in corneal power over 3 years.
    • Corneal toricity remained stable, with a minor but significant clockwise axis shift observed.

    Conclusions:

    • Corneal flattening continues during elementary and junior high school years, coinciding with axial length increases.
    • Corneal toricity is stable during these developmental years.
    • These findings contribute to understanding the biomechanical changes in the cornea during myopia development.