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Related Experiment Video

Updated: Mar 14, 2026

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
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Scheimpflug image-based changes in anterior segment parameters during accommodation induced by short-term reading.

Agnes Lipecz1, Alexis Tsorbatzoglou1, Ziad Hassan2

  • 1Department of Ophthalmology, Josa Andras Hospital, Nyíregyháza - Hungary.

European Journal of Ophthalmology
|September 21, 2016
PubMed
Summary

Short-term reading accommodation alters corneal volume and anterior chamber parameters in young adults. Keratometric values and corneal aberrometry remained stable, indicating specific ocular responses to visual tasks.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Physiology

Background:

  • Accommodation is a key visual function involving changes in the eye's optical power.
  • Understanding how short-term visual tasks affect anterior segment parameters is crucial for eye health and optical device design.

Purpose of the Study:

  • To investigate the impact of accommodation, induced by reading, on corneal and anterior chamber metrics.
  • To analyze changes in anterior segment parameters in healthy, nonpresbyopic adults after a short reading task.

Main Methods:

  • Utilized a Scheimpflug device (Pentacam HR) to capture ocular images.
  • Measured anterior segment parameters in a nonaccommodative state and after 15 minutes of reading with induced accommodation.
  • Analyzed differences in corneal and anterior chamber parameters between accommodative states.

Main Results:

  • Corneal volume (5.0mm and 7.0mm diameters) showed statistically significant changes with accommodation (p=0.01, p=0.03).
  • No significant changes were observed in keratometric values (p=0.35) or corneal aberrometry.
  • All measured anterior chamber parameters exhibited significant differences between nonaccommodative and accommodative states.

Conclusions:

  • Short-term accommodation primarily affects corneal volume and anterior chamber dimensions, not keratometry or aberrations.
  • The study highlights subtle corneal changes and shifts in pupil position and anterior chamber depth during accommodation.
  • Scheimpflug imaging effectively captures these dynamic changes in the anterior segment.