Effect of toric IOL rotation in capsular bag on visual quality in model eyes
10.3760/cma.j.cn115989-20250227-00056
- VernacularTitle:模型眼中生理囊袋内Toric IOL旋转对视觉质量的影响
- Author:
Xuehui LI
1
;
Hui SONG
1
Author Information
1. 天津医科大学眼科医院 天津医科大学眼视光学院 天津医科大学眼科研究所 国家眼耳鼻喉疾病临床医学研究中心天津市分中心 天津市视网膜功能与疾病重点实验室，天津 300384
- Publication Type:Journal Article
- Keywords:
Cataract;
Visual quality;
Model eye;
Toric intraocular lens
- From:
Chinese Journal of Experimental Ophthalmology
2025;43(12):1107-1113
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To determine the impact of the change in the position of the toric intraocular lens (IOL) on visual quality by implanting toric IOL in the physiological capsular bag in a model eye and simulating its rotation.Methods:Using the optical analysis software Zemax, four Liou-Brennan model eyes with pupil diameters of 3.0 mm and 6.0 mm, with or without the angle κ, were created.A + 22.0 D ArcySof toric T4 IOL was inserted into the Liou-Brennan model eye.The toric IOL was then simulated to rotate 5°, 10°, 20°, and 30° in the physiological capsular bag (tilted 4.90° temporally and decentered 0.21 mm nasally). Changes in wavefront aberrations, residual astigmatism, and modulation transfer function (MTF) curves were examined among the different groups.Results:The tilt and decentration of the toric IOL in the physiological capsular bag caused increases in both higher-order and lower-order aberrations, as well as an increase in residual astigmatism and a reduction in MTF values.Additionally, as the degree of rotation of the toric IOL increased, the aberrations and residual astigmatism increased gradually (for model eyes with 3-mm pupil diaters and no angle κ, rotating the IOL from 0° to 30° increased the residual astigmatism from 1.41 to 7.74 D). The rotation of the toric IOL primarily caused changes in lower-order aberrations (for model eyes with 3-mm pupil diaters and no angle κ, rotating the IOL from 0°to 30° increased astigmatism from 0.054 μm to 0.909 μm), with an increase in oblique trefoil aberration (for model eyes with 3-mm pupil diaters and no angle κ, rotating the IOL from 0° to 30° increased the oblique trefoil aberration difference from 0.000 μm to -1.481 μm), while the changes in coma and spherical aberrations were not significant.Furthermore, as the pupil diameter and angle κ increased, greater lower-order and higher-order aberrations were introduced, and the MTF values decreased.Conclusions:When the toric IOL is centered, it provides good optical quality.When the toric IOL rotates in the physiological capsular bag, its ability to correct astigmatism gradually weakens and the imaging quality deteriorates.Additionally, pupil diameter and angle κ also affect the visual quality after toric IOL implantation.
