| Summary: | 碩士 === 中山醫學大學 === 視光學系碩士班 === 105 === Purpose
To investigate the changes in relative peripheral refractive error (RPRE) with and without the intervention of accommodation.
Methods
The 19 subjects aged 18 to 30 years participated in this study, including 11 emmetropia eyes (spherical equivalent > -1.00 D) and 23 myopia eyes (SE≤ -1.00 D). Peripheral refractions were analyzed from the central to 25° for the temporal and nasal retina at both distance and near. To quantify the changes in relative peripheral refraction under accommodation, conventional sphero-cylindrical refractive error was converted into power vectors M (spherical equivalent), J0, and J45 for data analysis.
Results
When accommodation was used, there was an increasing trend in RPRE(M) for all the angles and significant differences were found at N25 (p = 0.001), N10 (p = 0.033), T10 (p = 0.034), T15 (p = 0.001), T20 (p < 0.0005), T25 (p < 0.0005). For J0, RPRE was also increased, which suggested that it changed from against-the-rule into with-the-rule astigmatism at N25 (p < 0.0005), N20 (p < 0.0005), N15 (p < 0.0005), N10 (p < 0.0005), T15 (p = 0.001), T20 (p < 0.0005), T25 (p < 0.0005).
Conclusion
The relative peripheral refractive errors changed under accommodation condition. It shifted from relative myopia to relative hyperopia for the temporal retina, and also from against-the-rule astigmatism to with-the-rule astigmatism. These results may help explain the association between relative peripheral refraction, accommodation and myopia development.
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