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[Diurnal fluctuations in human refraction].

K Krause1, A Taege

  • 1Universitäts-Augenklinik Münster.

Klinische Monatsblatter Fur Augenheilkunde
|January 1, 1988
PubMed
Summary

Morning and afternoon eye refractions in young students showed a slight decrease in the afternoon. This diurnal variation in spectacle values suggests factors beyond corneal changes influence vision.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Context:

  • Investigating diurnal variations in visual parameters.
  • Assessing refractive error changes throughout the day.
  • Utilizing standard optometric and ophthalmologic equipment.

Purpose:

  • To determine if spectacle values (refraction) change between morning and afternoon in young, healthy students.
  • To compare refractive measurements taken at different times of day.
  • To explore potential causes for observed refractive shifts.

Summary:

  • Spectacle values were measured in young healthy students using a phoropter and autorefractometer.
  • Keratometry was also performed to assess corneal curvature.
  • A consistent finding was that afternoon refraction values were approximately 0.25 diopters lower than morning values.

Impact:

  • Highlights a diurnal fluctuation in refractive error in young adults.
  • Suggests that the observed refractive shift is not solely due to changes in corneal radius.
  • Underscores the importance of considering time of day in refractive assessments.

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