Wavefront analysis and visual outcomes comparison between Acri.Smart 36A and Rayner intraocular lenses in high myopia
Jing Sun, A-yong Yu, Qin-mei Wang
(Eye Hospital of Wenzhou Medical College, Wenzhou 325003, Zhejiang Province, China)
PURPOSE: To study the clinical outcomes of the lower power aspherical intraocular lens (IOL) in high myopia pseudophakic patients.
METHODS: In this nonrandomized clinical comparing investigation, 17 eyes of 13 high myopia patients implanted with the aspherical IOL (Acri.Smart 36A, Acri.Tec) were compared with those of 23 eyes of 18 age-matched high myopia patients implanted with the spherical IOL (Rayner Superflex™ 620H, Rayner). Corneal and total aberrations for 4.0mm, 5.0mm and 6.0mm pupil diameters were measured using the Humphrey corneal topography and the WASCA wave-front analyzer respectively. The 30 Zernike terms up to 7th order were used to analysis. Best spectacle corrected visual acuity (BCVA), IOLs stability and complications were reported up to 3 months.
RESULTS: The aspherical IOL group and the spherical IOL group did not differ in age (54.24±6.476 years versus 52.61±5.525, P = 0.398), axial length (29.87±1.637mm versus 30.9 ±2.045, P = 0.400), IOL power (5.59±2.980 D versus 4.5±4.443 P = 0.077), BCVA, refraction and corneal aberrations at any same checked time. Preoperative corneal spherical aberration Z40 of all people in this study was 0.054±0.039μm, 0.145±0.068μm and 0.292±0.125μm at 4mm, 5mm, 6mm respectively. There were statistically significant differences of Z40 for 5mm pupil diameter (0.07±0.06μm in Acri.Smart group versus 0.17±0.11μm, P = 0.017) and for 6mm (0.12±0.06μm and 0.27±0.12μm correspondingly, P = 0.010) in total ocular aberration except for 4.0mm pupil (p=0.54) 3 months postoperatively.
CONCLUSIONS: Lower power aspherical IOL still greatly offset the existing positive corneal spherical aberration comparing the spherical IOL, which would be more helpful for larger pupil diameter in high myopia patients. However, no improved visual acuity was observed.
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