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Refractive variation during autorefraction: multivariate distribution of refractive status
1Department of Optometry, Rand Afrikaans University, Johannesburg, South Africa.
Summary
Refractive variations in optometry students were analyzed using autorefraction. Data showed diverse distributions, with outliers and multimodal patterns potentially indicating accommodative or fixation anomalies.
Area of Science:
- Ophthalmology and Optometry
- Biomedical Data Analysis
Background:
- Understanding refractive error variation is crucial for optometric practice.
- Autorefraction is a common tool, but its data variability requires detailed analysis.
Purpose of the Study:
- To examine the refractive variation in optometry students using autorefraction.
- To visualize and analyze data distributions, including deviations from normality.
Main Methods:
- Autorefraction was performed on 106 optometry students (63 females, 43 males).
- Stereo-pair scatter plots in 3D h-space were used to visualize data distributions.
- Analysis included identifying outliers and multimodal distributions.
Main Results:
- Observed a wide range of data distributions, from tightly clustered to loosely spread.
- Identified outliers and multimodal distributions, suggesting potential accommodative or fixation issues.
- Test eye measurements showed tight clusters, indicating minimal autorefractor contribution to variation.
Conclusions:
- Refractive data variability in students is significant and complex.
- Deviations from normality like outliers and multimodal patterns offer insights into ocular function.
- Autorefractors are reliable, with observed variations stemming primarily from physiological factors.