Ocular higher-order aberrations in myopia and skiascopic wavefront repeatability
Accepted 28 October 2004.
Purpose
To study the distribution of ocular higher-order aberrations (HOAs) in a myopic population and to assess the repeatability of HOA measurements determined by a commercially available skiascopic wavefront sensor.
Setting
Department of Ophthalmology, Assaf Harofeh Medical Center, Zerifin, Israel.
Methods
Ocular HOAs were examined 3 times across a 6.0 mm naturally dilated pupil in 61 eyes using the Optical Path Difference (OPD)-scan wavefront aberrometer. Root-mean-square (RMS) values of HOAs, total spherical aberration (TSA), total coma (TC), and total trefoil (TT) were analyzed. Correlation analysis was performed to assess the aberration symmetry between right and left eyes. The repeatability of the OPD-scan measurements was assessed by calculating Pearson r correlation coefficients between each pair of measurements and the interclass correlation coefficients between the 3 measurements of each score.
Results
The mean RMS values of HOAs, TSA, TC, and TT were 0.347 μm ± 0.252 (SD), 0.120 ± 0.174 μm, 0.165 ± 0.168 μm, and 0.252 ± 0.157μm, respectively. The HOAs, TSA, TC, and TT changed slightly and not significantly with increasing refractive error (all P>.05). The RMS level of HOAs and TTR of the 3rd measurement was significantly different from the 1st and 2nd measurements (P<.05), with overall low correlation between the 3 measurements for the HOAs, TSA, TC, and TT.
Conclusions
The ocular wavefront aberrations varied greatly from subject to subject. Ocular HOAs were not correlated with refractive error. The repeatability of HOAs measurements with the OPD-aberrometry was low.
From the Department of Ophthalmology (Zadok, Segal, Barkana, Morad, Avni), Assaf Harofeh Medical Center (affiliated with the Tel Aviv University), Zerifin, and Department of Ophthalmology (Levy), E. Wolfson Medical Center (affiliated with the Tel Aviv University), Holon, Israel
Address reprint requests to David Zadok, MD, Department of Ophthalmology, Assaf Harofeh Medical Center, Zerifin 70300, Israel.
No author has a financial or proprietary interest in any material or method mentioned.
ABSTRACT