Influence of the pupil size on visual quality and spherical aberration after implantation of the Tecnis 1-piece intraocular lens.

Abstract

To evaluate the influence of the pupil size on clinical results and objective parameters of optical quality of the Tecnis 1-piece (ZCB00) intraocular lens. Centre of Ophthalmology, Eberhard-Karls University Tübingen, Germany. In this study 51 eyes were implanted with a Tecnis 1-piece IOL. Best corrected visual acuity (BCVA) and uncorrected visual acuity (UCVA) were assessed postoperatively. Total spherical aberration and corneal spherical aberration for optical zones of 3, 4, 5 and 6 mm were measured. Contrast sensitivity and depth of focus were evaluated with a 3 mm and 5 mm pinhole (PH). The mean follow-up time was 3.0 ± 0.4 months. Mean UCVA and BCVA were 20/25 ± 8 letters and 20/18 ± 4 letters, respectively. BCVA with both a 3 and a 5 mm PH was 20/18 ± 4 letters. The corneal spherical aberration was 0.02 ± 0.01, 0.06 ± 0.03, 0.14 ± 0.09 and 0.27 ± 0.22 for 3, 4, 5 and 6 mm optical zones. Mean total spherical aberration was -0.01 ± 0.02, 0.0 ± 0.03, 0.0 ± 0.06 and 0.0 ± 0.08 μm for 3, 4, 5 and 6 mm optical zones, respectively. Contrast sensitivity was not statistically significant different with a 5 mm or 3 mm PH. In addition, the defocus curves with a 3 mm and a 5 mm PH were not statistically significant different. The aspheric profile of the Tecnis 1-piece IOL reduces total spherical aberration to virtually zero at all pupil sizes from 3-6 mm. Thus, visual acuity, contrast sensitivity, refraction and defocus curve show the same good results at large pupil sizes compared with small pupil sizes.