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Research Article: Tolerance to induced astigmatism of patients with trifocal or extended depth of focus intraocular lens implantation

Date Published: 2024-08-23

Abstract:
Background: Residual astigmatism is common after cataract surgery involving implantation of an intraocular lens, yet the tolerance of presbyopia-correcting intraocular lens to astigmatism of different magnitudes and axes is poorly understood. Here we compared visual acuity and quality in the presence of induced astigmatism after implantation of a trifocal or extended-depth-of-focus (EDOF) intraocular lens, the two widely used presbyopia-correcting intraocular lenses.

Introduction:
Objective visual quality was measured in terms of the modulation transfer function cutoff frequency (MTF cutoff), Strehl ratio (SR), and objective scatter index (OSI) using a dual-channel Optical Quality Analysis System II (Visiometrics, Terrassa, Spain). Contribution of residual refractive errors to these three measurements was removed by using additional lenses or the system’s built-in low-order aberration correction. Visual quality was measured under the nine situations of induced astigmatism as described above.

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