Journal List > J Korean Ophthalmol Soc > v.50(5) > 1008544

Park, Wee, Lee, and Kim: Comparison of WaveScan Aberrometer Refraction to Subjective Manifest Refraction and Autorefractor



To compare the accuracy of myopic refraction using an aberrometer (WaveScan, Visx, Santa Clara, CA, USA) with manifest refraction using retinoscopy and an autorefractor.


The medical records of 200 eyes in 100 patients who visited our clinic from February 2005 to February 2007 for refractive surgery were reviewed retrospectively. We compared the refractive errors obtained using an aberrometer, retinoscopy, and an autorefractor (KR-7100, Topcon, Tokyo, Japan). All of the measured refractive errors were converted to power vectors for statistical analysis. The power vectors consisted of the M vector (M), J0 vector (J0), and J45 vector (J45).


The mean sphere was −4.75 diopters (D) and the mean cylinder was −0.66D with retinoscopy. Power vectors of the aberrometer (PVw) were highly correlated with power vectors of retinoscopy (PVr) and the autrorefractor (PVa). The correlation coefficients (R2) between PVw and PVr were 0.960 (M), 0.852 (J0), and 0.679 (J45) and the correlation coefficients between PVw and PVr were 0.963 (M), 0.685 (J0), and 0.516 (J45). Mean differences were −0.247±0.412D (M), 0.034±0.120D (J0), and −0.017±1.07D (J45) between PVw and PVr, and were –0.068±0.403D (M), −0.055±0.194D (J0), and −0.052±0.165D (J45) between PVw and PVa.


The measurement of refractive errors using a WaveScan aberrometer seems to be reliable and accurate, although some myopic shift was observed.


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Figure 1.
Correlation graphs and correlation coefficients.
Table 1.
Best corrected visual acuity of patients
Visual acuity Number Percent Cumulative percent
20/12.5 30 15% 14%
20/16 141 70.5% 85.5%
20/20 29 14.5% 100%
Table 2.!
Descriptive statistics of vector analysis
WaveScan (D) Manifest refraction (D) Autorefraction (D)
M vector −5.00±2.07 −4.75±2.04 −4.93±2.11
J0 vector 0.266±0.310 0.232±0.297 0.320±0.343
J45 vector −0.028±0.190 −0.012±0.165 0.024±0.237


Table 3.
Linear regression statistics with the vectors of the WaveScan
Pearson correlation R2 p Value
WaveSacn M vector 0.980 0.960 <0.001
− Manifest refraction J0 vector 0.923 0.852 <0.001
J45 vector 0.825 0.679 <0.001
WaveSacn M vector 0.982 0.963 <0.001
− Autorefractor J0 vector 0.829 0.685 <0.001
J45 vector 0.720 0.516 <0.001
Table 4.
Difference of the vectors between the instruments
Difference (Mean±SD) 95% Confidence Interval p Value
WaveSacn M vector −0.247±0.412 −0.305, −0.189 <0.001
− Manifest refraction J0 vector 0.034±0.120 0.017, 0.050 <0.001
J45 vector −0.017±0.107 −0.031, −0.002 0.031
WaveSacn M vector −0.068±0.403 −0.124, −0.012 0.018
− Autorefractor J0 vector −0.055±0.194 −0.082, −0.028 <0.001
J45 vector −0.052±0.166 −0.075, −0.029 <0.001
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