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Reproducibility of sphero-cylindrical prescriptions
1Vision for the Developing World, Nuffield Laboratory of Ophthalmology, University of Oxford, Oxford, UK. graeme.mackenzie@eye.ox.ac.uk
Summary
Optometrist refractions show significant variability, with the stigmatic component differing by over 0.78 D in about 5% of cases. This impacts the reliability of refractive data in studies.
Area of Science:
- Ophthalmology and Optometry
- Clinical Research Methodology
Background:
- Sphero-cylindrical refraction is a key component of eye examinations.
- Assessing the reproducibility of refractive measurements is crucial for clinical and research applications.
Purpose of the Study:
- To evaluate the reproducibility of sphero-cylindrical prescriptions provided by 40 optometrists.
- To quantify the variability in refractive measurements obtained by different practitioners.
Main Methods:
- Forty registered optometrists performed sphero-cylindrical refraction on a single asymptomatic subject.
- Reproducibility was assessed using 95% limits of agreement, scatterplots, and distribution ellipsoids.
Main Results:
- The mean stigmatic refraction for the right eye was -0.83 D (SD = 0.28 D).
- The 95% reproducibility limits for the stigmatic component were 0.78 D.
- Inter-ocular differences in refractive components ranged from -0.50 D to +0.50 D.
Conclusions:
- Refractions performed by different optometrists can differ significantly in their stigmatic component.
- The observed reproducibility is approximately twice as variable as repeatability conditions.
- Findings have implications for analyzing refractive data in replication, longitudinal, and epidemiological studies.
