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Refractive changes during off-the-axis retinoscopy in myopia.

Ritesh Kumar Chaurasiya1

  • 1Department of Optometry, Sanjivni Eye and Medicare Centre, Ambala, Haryana, India.

Indian Journal of Ophthalmology
|February 28, 2022
PubMed
Summary

Off-axis retinoscopy in myopic patients shows increased refractive error with greater eccentricity. This study found significant myopic shifts at 10° and 20° off-axis, highlighting potential inaccuracies in ocular examinations.

Keywords:
Eccentricitymyopic shiftretinoscopy

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Area of Science:

  • Ophthalmology
  • Optometry
  • Refractive Error Analysis

Background:

  • Retinoscopy is a common method for determining refractive error.
  • Off-axis measurements may introduce variability in refractive assessment.
  • Understanding these variations is crucial for accurate ocular examinations.

Purpose of the Study:

  • To investigate the refractive shift during off-axis retinoscopy in myopic patients.
  • To quantify the impact of cycloplegic drugs on these measurements.
  • To analyze the accuracy of retinoscopy at different eccentricities.

Main Methods:

  • Prospective cross-sectional study involving 10 myopic patients with refractive errors ≤ -3.00 D.
  • Cycloplegic refraction performed at 0°, 10°, and 20° by a single examiner.
  • Statistical analysis using descriptive data and paired t-test for on-axis vs. off-axis comparisons.

Main Results:

  • A mean myopic shift of approximately 7% at 10° and 18% at 20° eccentricity was observed.
  • Mean spherical equivalent refractions were -2.5495 D (0°), -2.737 D (10°), and -3.0265 D (20°).
  • Statistically significant differences (P < 0.05) were found between on-axis and off-axis measurements.

Conclusions:

  • Increased eccentricity during retinoscopy induces greater errors in refractive assessment.
  • Off-axis measurements can lead to an overestimation of myopia.
  • Clinical practice should consider the impact of retinoscopy angle on refractive outcomes.