Relationship between ocular wavefront aberrations and refractive error in Chinese school children
Article first published online: 28 MAY 2012
© 2012 The Authors. Clinical and Experimental Optometry © 2012 Optometrists Association Australia
Clinical and Experimental Optometry
Volume 95, Issue 4, pages 399–403, July 2012
How to Cite
Li, T., Zhou, X., Chen, Z., Zhou, X., Chu, R. and Hoffman, M. R. (2012), Relationship between ocular wavefront aberrations and refractive error in Chinese school children. Clinical and Experimental Optometry, 95: 399–403. doi: 10.1111/j.1444-0938.2012.00739.x
- Issue published online: 12 JUL 2012
- Article first published online: 28 MAY 2012
- Submitted: 18 August 2011; Revised: 10 January 2012; Accepted: 11 January 2012
- natural pupils;
- refractive error;
- wavefront aberrations
Background: The relationship between ocular wavefront aberrations and refractive error in children's eyes remains controversial. The purpose of this study is to re-examine this relationship in Chinese school children under natural distance accommodation.
Methods: Ocular wavefront aberrations were measured in 86 Chinese children with spherical equivalent refraction (SER) between +0.5 D and -6.0 D and astigmatism less than -1.00 D. Wavefront aberrations were calculated using an objective method based on the Hartmann-Shack principle. Refractive error was obtained using a phoropter after cycloplegia. Subjects were categorised into three groups based on the mean SER: emmetropia (SER from -0.50 D to +0.50 D), mild myopia (SER greater than -0.50 D to -3.00 D) and moderate myopia (SER greater than -3.00 D to -6.00 D). Of the 86 participants, 22 were emmetropic, 43 were mildly myopic and 21 were moderately myopic. The root mean square (RMS) values of higher-order aberrations, Zernike coefficients (third-, fourth- and fifth-order aberrations) and Rj (the ratio of third-, fourth- or fifth-order aberrations to total higher-order aberrations) were compared across the three refractive groups.
Results: No significant correlations were found between the RMS values of total higher-order aberrations, third-order aberrations, fourth-order aberrations, fifth-order aberrations, spherical aberration or coma and SER. No significant differences in the RMS values of total higher-order aberrations or Rj were observed among the groups. The difference in fifth-order aberrations was statistically significant among the groups (p = 0.022); no other differences in higher-order aberration were found. Aside from C (3,1), no other differences were observed for Zernike coefficients.
Conclusion: Ocular wavefront aberrations are similar among Chinese school children with different refractive errors under natural accommodation for a distance target. There is no evidence that myopes have a different amount of ocular higher-order aberrations than emmetropes.