Accepted 10 August 2005. published online 31 October 2005.
Purpose
To quantify and characterize higher order aberrations in children and to investigate the influence of refractive error and cycloplegia.
Design
Observational cross-sectional study.
Methods
setting: Clinical practice. patients: One hundred sixty-two eyes of 82 children were examined. The mean age of the children was 6.7 years (range, 4 to 14 years), and the mean manifest refractive spherical equivalent was 2.39 ± 3.35 diopters (range, −8.98 to +8.45 diopters). Aberrometry was performed with a wavefront analyzer (after cycloplegia and mydriasis with cyclopentolate 1%). Aberrometry was also conducted on a subgroup of 52 eyes of 27 children, both before and 30 minutes after the instillation of cyclopentolate 1% to investigate the effect of paralysis of accommodation.
Results
Mean root mean square values of total-, third-, fourth-, and fifth-order aberrations were 0.37 ± 0.13 μm, 0.23 ± 0.12 μm, 0.16 ± 0.11 μm, and 0.08 ± 0.12 μm, respectively. Mean root mean square values of total coma (Z3−1, Z31, Z5−1, Z51) and total trefoil (Z3−3, Z33, Z5−3, Z53) were 0.27 ± 0.31 μm and 0.21 ± 0.29 μm, respectively. Myopes had statistically significant greater levels of total (P = .005) and fourth order (P = .002) aberrations and Zernicke terms (Z3−3, Z3−1, Z33, Z4−4, and Z42) compared with hyperopes. Cycloplegia had minimal influence on higher-order aberrations.
Conclusion
Significant levels of higher-order aberrations were found in these children. They were influenced by refractive error, because myopes had significantly greater levels compared with hyperopes. Paralysis of accommodation with cyclopentolate appeared to have little effect on higher-order aberrations.
The Childrens University Hospital, University College, Dublin, Ireland.
Inquiries to Professor Michael O’Keefe, Suite 5, Mater Private Hospital, Eccles St, Dublin 7, Ireland; fax: 00 353 1 8858490
ABSTRACT