Changes of Higher-order Aberrations According to the Increase of refractive Errors

Abstract

To identify the relationship between spherical refractive errors and HoAs and the relationship between cylindrical refractive errors and HOAs, the HOAs within 6mm zone were measured. The refractive errors and HOAs were measured by KR-9000PW (Topcon Corp., Japan), a wavefront aberrometer using Hartmann-Shack method, and the aberrations within the 6mm range of pupil diameter were measured. The Zernike coefficients from 3rd to 4th expressions were analyzed. All HOAs such as trefoil aberration, coma aberration, tetrafoil aberration, 2nd astigmatism, and spherical aberration that were analyzed showed a significant correlation with cylindrical refractive error. on the other hand, only spherical aberration had a correlation with the spherical refractive error in the comparison between HoAs and spherical refractive error, and the remaining aberrations had no significant correlation. In the comparison with Zernike coefficients, Z40, Z42, and Z44 had a significant correlation with the Spherical refractive error and cylindrical refractive error, while Z31 had a significant correlation only with the spherical refractive error. The other coefficients had no significant correlation with both spherical refractive error and cylindrical refractive error. Since HOAs have very small values compared to refractive error and the values change greatly in each measurement, it is considered necessary to measure HoAs more precisely to identify the correlations among each other.