PURPOSE
To compare higher order aberrations measured with the NIDEK OPD-Scan and AMO WaveScan.
METHODS
Third- to sixth-order higher order aberrations were measured in 1072 eyes using the OPD-Scan and WaveScan. Means, standard deviations, confidence intervals, limits of agreement, and intraclass correlation coefficients (ICC) were calculated.
RESULTS
Aberrations of greatest magnitude with the OPD-Scan were Z -33 (–0.113±0.243 µm), Z 04 (0.073±0.137 µm), and Z -13 (–0.058±0.165 µm), and with the WaveScan, Z -33(–0.054±0.103 µm), Z04 (0.049±0.083 µm), and Z13 (–0.017±0.100 µm). The largest difference in magnitude between the two aberrometers was with Zernike polynomial Z -33(–0.060±0.205 µm). Medium consistency (0.6 < ICC <0.8) was found between the two instruments for Z -13 and Z04. All other Zernike polynomials had a poor consistency (ICC<0.6) including the total root-mean-square (RMS) higher order aberrations.
CONCLUSIONS
Poor consistency was found for all aberrations except Z -13 and Z04, which demostrated medium consistency. Expected aberration reference values are reported for both instruments. [J Refract Surg. 2010;26(8):605-608.]
ABOUT THE AUTHORS
From the School of Biomedical Sciences, University of Ulster, Coleraine (McAlinden); University of Ulster, Cathedral Eye Clinic, Belfast (McAlinden, Moore); and Mater Hospital, Belfast Health and Social Care Trust, Belfast (Moore), United Kingdom.
Funding for this study was received from the Department for Employment and Learning (DEL), Belfast, Northern Ireland, United Kingdom.
The authors have no financial or proprietary interest the materials presented herein.
Correspondence: Colm McAlinden, BSc (Hons), MSc, MCOptom, School of Biomedical Sciences, University of Ulster, Cromore Rd, Coleraine, BT52 1SA, United Kingdom. Tel: 44 775 673 9138; E-mail: colm.mcalinden@gmail.com
Received: October 9, 2009; Accepted: March 4, 2010
Posted online: April 15, 2010
doi:10.3928/1081597X-20100407-02
