Influence of decentration of plate-haptic toric intraocular lens on postoperative visual quality

Background To evaluate the influence of decentration of plate-haptic toric intraocular lens (IOLs) on visual quality. Methods This study enrolled 78 eyes of 78 patients. Patients in group A were implanted with toric IOLs, and patients in group B were implanted with monofocal IOLs. All patients were divided into group A1 and B1 (decentration below 0.3 mm) and group A2 and B2 (decentration above 0.3 mm). The uncorrected distance visual acuity (UDVA), best corrected visual acuity (BCVA), modulation transfer function cutoff (MTF cutoff), objective scatter index (OSI), strehl ratio (SR), optical interference and patients’ satisfaction were measured in different pupils at three months postoperatively. The associations between decentration and visual quality were analyzed by Spearman correlation. Results There were no significant differences in UDVA, BCVA, MTF cutoff, OSI, SR, optical interference and patients’ satisfaction among subgroups. The differences in decentration between groups A and B were not statistically significant. In group A2, the total higher order aberrations (tHOAs) at pupil sizes of 3 mm ( P = 0.046), 5 mm ( P = 0.014), spherical aberrations at pupil sizes of 3 mm ( P = 0.011), 4 mm ( P = 0.014), 5 mm ( P = 0.000), secondary astigmatism at pupil sizes of 3 mm ( P = 0.002), 4 mm ( P = 0.005) were higher than in group B2. Compared to group A1, group A2 had higher spherical aberrations at pupil sizes of 4 mm ( P = 0.042), 5 mm ( P = 0.001), 6 mm ( P = 0.038), secondary astigmatism at pupil sizes of 3 mm ( P = 0.013), 4 mm ( P = 0.005), 6 mm ( P = 0.013). Group B2 has higher coma and secondary astigmatism than group B1 at 6-mm pupil ( P = 0.014, P = 0.045). Significant positive correlations were found between spherical aberrations and the decentration of group A1 and A2 at 6-mm pupils. Conclusion The decentration above 0.3 mm negatively affected visual quality due to increased tHOAs, spherical aberrations, coma and secondary astigmatism aberrations, the influence become larger with increasing pupil diameter. And toric IOLs are more affected by decentration than monofocal IOLs.