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Variation during autorefraction: influence of two different target types

A Rubin1, W D Gillan

  • 1Department of Optometry, Rand Afrikaans University, Auckland Park, South Africa.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 1, 1997
PubMed
Summary

This study on autorefractor measurements found that target types generally have little influence on results for most eyes. Differences in refractive state or variation between targets were minimal in this investigation.

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Area of Science:

  • Optometry
  • Ophthalmology
  • Vision Science

Background:

  • Autorefractors are crucial for objective refractive error assessment.
  • Understanding factors influencing autorefractor accuracy is essential for reliable eye examinations.

Purpose of the Study:

  • To investigate the impact of two distinct target types on autorefractor measurements.
  • To evaluate differences in refractive state and variation between target types.

Main Methods:

  • Utilized a single autorefractor with two different target presentation capabilities.
  • Employed multivariate statistical methods and formal hypothesis testing.
  • Analyzed data from seven subjects of varying ages.

Main Results:

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  • Most eyes exhibited similar variation and behavior with both target types.
  • The mean refractive state was not significantly different for both targets in five out of seven eyes (99% confidence level).
  • Outliers significantly impacted decision-making regarding target influence.

Conclusions:

  • Weak evidence suggests minimal differences in variation or mean refractive state between target types when data follows multivariate normality.
  • Departures from normality, such as outliers, are critical considerations in autorefractor target analysis.
  • Further research may be needed to fully elucidate target influence on autorefractor outcomes.