Measurement of corneal spherical aberration with KR-1W aberrometer in age-related cataract patients

Abstract

Objective To investigate the measurement of corneal spherical aberration in cataract patients with KR-1W aberrometer. Methods The data of 200 eyes of 142 patients with age-related cataract were collected and examined. High order aberrations (HOAs) from the anterior surface of cornea were measured, which included the total high order aberration (tHOA), spherical aberration (SA), coma and trefoil. Root-mean-square (RMS) values of HOAs were obtained with KR-1W aberrometer, both at 4.0 mm and 6.0 mm pupil diameters (PD). Results At 4 mm PD, age-related cataract patients corneal tHOA, SA, coma and trefoil in turn were (0.17±0.06) μm, (0.05±0.03) μm, (0.10±0.05) μm and (0.10±0.06) μm. At 6 mm PD, the corneal tHOA, SA, coma and trefoil in turn were (0.48±0.13) μm, (0.25±0.07) μm, (0.26±0.12) μm and (0.20±0.10) μm. The range of SA with 6mm PD was from 0.06 μm to 0.54 μm. Conclusion Design of aspheric IOLs based on + 0.27 μm corneal SA is reasonable. Given on account of the wide distribution range of corneal SA, aspheric IOLs should be individually selected based on measurement of corneal SA before cataract surgery. Key words: Cataract, age-related; Aberration, high order; Aberration, spherical; Aberrometer, KR-1W