Abstract
Purpose: :
To investigate wavefront aberrations, especially the amount and intraindividual distribution of the corneal spherical aberrations (CSAs) in Japanese patients undergoing cataract surgery.
Methods: :
Corneal and total ocular aberrations with a 6.0-mm pupil were measured with a wavefront sensor (KR-9000PW, Topcon, Tokyo) in 324 eyes of Japanese patients before and after cataract surgery with intraocular lens (IOL) implantation through a 3-mm corneoscleral incision; the corneal aberrations (CAs) were analyzed by corneal topography, and the total ocular aberrations (TOAs) were analyzed using Shack-Hartmann aberrometry.
Results: :
CAs and postoperative TOAs were obtained in all 324 eyes, although the preoperative TOAs were measurable in only 147 eyes because of cataractous opacity. The preoperative CSA values were distributed normally and ranged from -0.20 to +0.74 micrometer (median, +0.26 micrometer). The CSAs and corneal astigmatism were not significantly altered postoperatively. The postoperative total ocular spherical aberrations (TOSAs) were larger than the CSAs and the preoperative TOSAs in eyes with conventional spherical IOLs and were smaller in those with aspherical IOLs ( SN60WF,Alcon; FY60AD,HOYA).
Conclusions: :
The amount and intraindividual distribution of the CSAs in a Japanese population were similar to those reported previously in American and European subjects. Small-incision cataract surgery hardly affects CAs. These results provide useful information that can aid in the improvement of optical IOL designs to obtain better quality of vision.
Keywords: aberrations • intraocular lens • cataract