AIM: To compare the refractive errors measured by the VISX WaveScan, OPD-Scan Ⅲ and the subjective refraction.

METHODS: Seventy-six patients(152 eyes)were recruited from January 2013 to December 2013. All patients were measured with subjective refraction by the phoropter(NIDEK, RT-5 100), objective refraction by the WaveScan(AMO Company, USA), OPD-Scan Ⅲ(Nidek Technologies, Japan). The sphere, cylinder, axis of the three methods were compared and analyzed.

RESULTS: The sphere measured by WaveScan was lower than that by subjective refraction, the difference was 0.13±0.30D(t=3.753, P<0.001). For cylinder, the difference was 0.13±0.43D(t=3.664, P<0.001). There was no significance for sphere, cylinder, and spherical equivalent between OPD-Scan Ⅲ and subjective refraction(P>0.05). The value of the difference between WaveScan and subjective refraction was 5.87°±6.19° for the axis and the difference between OPD-Scan Ⅲ and subjective refraction was 3.82°±3.95°. There was statistic significance(t=2.817, P=0.006).

CONCLUSION: For sphere and cylinder,WaveScan generated some deviation relative to subjective refraction. The Nidek OPD-Scan Ⅲ gives more accurate measures of objective refraction when compared with subjective refraction.