Comparison on the efficacy between the multifocal and monofocal aspheric toric intraocular lens in cataract patients

Abstract

Objective To compare the clinical efficacy between the multifocal and monofocal aspheric toric intraocular lens in cataract patients. Methods Seventy-two eyes of 56 patients with age-related cataract underwent phacoemulsification were randomly divided into 2 groups. In group A, the aspheric multifocal toric intraocular lens were implanted in 37 eyes of 29 patients. In group B, the aspheric monofocal toric intraocular lens were implanted in 35 eyes of 27 patients. After surgery, the visual acuity, postoperative residual corneal astigmatism, the IOL axis rotational stability, higher-order aberrations and contrast sensitivity were observed and statistically analyzed. Results At 3 months after surgery, the differences in uncorrected near visual acuities (log MAR) were statistically significant between two groups (t=8.569, P=0.003). There was no significant difference in the uncorrected distance, corrected distance or near visual acuity (log MAR) between two groups (t=1.578、1.325、1.098, P= 0.236、0.281、0.217). There was no significant difference in postoperative residual corneal astigmatism between two groups (t=1.775, P=0.135). There was no significant difference in the axis rotation between two groups (t=2.165, P=0.117). There was no significant difference in the general higher-order aberration, 3-order aberration, 4-order aberration or 5-order aberration root mean square value between two groups (t=1.567, 1.256, 1.457, 1.298, P=0.167, 0.158, 0.136, 0.237). There was no significant differrence at any spatial frequenciy of contrast sensitivity function between two groups (t=1.256, 2.359, 1.238, 2.258, 2.156, 1.982, 2.032, 2.987, P= 0.982, 0.758, 0.875, 0.702, 0.112, 0.189, 0.238, 0.356). Conclusion Phacoemulsification combined with aspheric multifocal toric intraocular lens implantation is an effective method for the correction of preexisting corneal astigmatism in cataract patient. The better uncorrected distance and near visual acuities are obtained for cataract patients. The surgery improves spectacles independence for distance vision and spectacles independence for near vision, with a high patient satisfaction. Key words: Cataract, age-related; Lens, intraocular, multifocal, monofocal, astigmatism-correcting, aspherical