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Repeatability of subjective and objective refraction

M Rosenfield1, N N Chiu

  • 1State University of New York, State College of Optometry, New York, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 1, 1995
PubMed
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Subjective refraction under masked conditions and objective refraction show similar repeatability. A minimum significant shift in refractive status of +/- 0.50 D is recommended for both methods.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Repeatability of objective refraction is well-studied.
  • Data on masked subjective refraction repeatability is limited.
  • Understanding refraction measurement variability is crucial for clinical practice.

Purpose of the Study:

  • To compare the repeatability of masked subjective refraction and objective refraction.
  • To determine the minimum significant change in refractive error.

Main Methods:

  • 12 subjects underwent refractive error assessment 5 times.
  • Masked subjective refraction used a covered phoropter sphere scale.
  • Objective refraction utilized a Canon Autoref R-1 infrared autorefractor.

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Main Results:

  • Mean standard deviations were +/- 0.14 D for subjective and +/- 0.18 D for objective refraction.
  • 95% confidence limits were +/- 0.27 D (subjective) and +/- 0.35 D (objective).

Conclusions:

  • Both masked subjective and objective refraction techniques demonstrate comparable repeatability.
  • A change of at least +/- 0.50 D is proposed as the minimum significant shift in refractive status.