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Effect of decentration and tilt on the in vitro optical quality of monofocal and trifocal intraocular lenses

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Abstract

Purpose

To evaluate and compare the effect of decentration and tilt on the optical quality of monofocal and trifocal intraocular lenses (IOL).

Methods

Optical quality of a monofocal IOL (AcrySof IQ SN60WF; Alcon Laboratories, Inc., USA) and a trifocal IOL (AcrySof IQ PanOptix; Alcon Laboratories, Inc., USA) was assessed using an in vitro optical bench (OptiSpheric IOL R&D; Trioptics GmbH, Germany). At apertures of 3.0 mm and 4.5 mm, modulation transfer function (MTF) at spatial frequency of 50 lp/mm, MTF curve and the United States Air Force (USAF) resolution test chart of the two IOLs were measured and compared at their focus with different degrees of decentration and tilt. Optical quality at infinity, 60 cm and 40 cm and the through-focus MTF curves were compared when the two IOLs were centered at apertures of 3.0 mm and 4.5 mm. Spectral transmittance of the two IOLs was measured by the UV–visible spectrophotometer (UV 3300 PC; MAPADA, China).

Results

The SN60WF and the PanOptix filtered blue light from 400 to 500 nm. Both IOLs at the far focus and the PanOptix at the intermediate focus showed a decrease in optical quality with increasing decentration and tilt. The PanOptix demonstrated enhanced optical quality compared to the previous gradient at the near focus at a decentration range of 0.3–0.7 mm with a 3.0 mm aperture, and 0.5 mm with a 4.5 mm aperture, whereas other conditions exhibited diminished optical quality with increasing decentration and tilt at the focus of both IOLs. When the two IOLs were centered, the SN60WF had better optical quality at infinity, while the PanOptix had better optical quality at 60 cm and 40 cm defocus. The optical quality of the SN60WF exceeded that of the PanOptix at far focus, with a 3 mm aperture decentration up to 0.7 mm and a 4.5 mm aperture decentration up to 0.3 mm; this observation held true for all tilts, irrespective of aperture size. As both decentration and tilt increased, the optical quality of the SN60WF deteriorated more rapidly than that of the PanOptix at the far focal point.

Conclusions

The SN60WF showed a decrease in optical quality with increasing decentration and tilt. Optical quality of the PanOptix at the near focus increased in some decentration conditions and decreased in some conditions, while it showed a decrease at the other focuses with increasing decentration. While tilt only had a negative effect on optical quality. When both IOLs were centered, the PanOptix provided a wider range of vision, while the SN60WF provided better far distance vision. At the far focus, the SN60WF has better resistance to tilt than the PanOptix, but the optical quality degrades more quickly when decentered and tilted.

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Funding

This study was funded by the Medical Research Project of Sichuan Province (grant number S21011).

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Author notes

  1. Ruo-Lin Pan and Qing-Qing Tan contributed equally to this work.

Authors and Affiliations

  1. Department of Ophthalmology, Affiliated Hospital of North Sichuan Medical College, Nanchong, China

    Ruo-Lin Pan, Qing-Qing Tan, Xuan Liao, Li-Xuan **e, Su-Yun Qin & Yu-Ling Tang

  2. Chengdu Eastern Aier Eye Hospital, 388 Shuang Lin Road, Chengdu, 610051, Sichuan, China

    Chang-Jun Lan

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  1. Ruo-Lin Pan
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Correspondence to Chang-Jun Lan.

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Pan, RL., Tan, QQ., Liao, X. et al. Effect of decentration and tilt on the in vitro optical quality of monofocal and trifocal intraocular lenses. Graefes Arch Clin Exp Ophthalmol (2024). https://doi.org/10.1007/s00417-024-06490-1

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