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Optical tolerance to rotation of trifocal toric intraocular lenses as a function of the cylinder power

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Ruiz Alcocer, Javier and Lorente Velázquez, Amalia and Gracia, Pablo, de (2020) Optical tolerance to rotation of trifocal toric intraocular lenses as a function of the cylinder power. European Journal of Ophthalmology . ISSN 1120-6721

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Official URL: https://doi.org/10.1177/1120672120926845




Abstract

Background: The aim was to assess the impact of 5- and 10-degree rotations in the optical quality of a trifocal toric intraocular lens with different amounts of cylinder.
Methods: Two Physiol Toric intraocular lenses with 1.5 and 3.0 D of cylinder were analysed in three different positions: centred, 5 and 10 degrees rotated. The optical quality of the intraocular lenses was evaluated with the PMTF optical bench through specific perpendicular targets. The analysis was performed by the through-focus modulation transfer function curves and the modulation transfer function corresponding to distance vision (0 D of vergence).
Results: For a centred situation, the through-focus modulation transfer function curves of both intraocular lenses showed the classical three peaks corresponding to the powers of the two principal meridians of the intraocular lenses. When 5 and 10 degrees of rotation were induced, the three peaks were attenuated in both cases. The case with the intraocular lens with 3.0 D of cylinder and 10 degrees of rotation showed the worst optical quality and a significant loss of trifocality. The modulation transfer function values obtained for distance vision also showed the worst optical quality for the intraocular lens with 3.0 D of cylinder and 10 degrees of rotation.
Conclusion: Rotations over 5 degrees decreased the optical quality of trifocal toric intraocular lenses, being this reduction moderate from 5 to 10 degrees for low levels of cylinder (≤1.5 D). For mid-high levels of cylinder (≥3.0 D), rotations over 5 degrees cause a significant loss of optical quality at all object distances.


Item Type:Article
Uncontrolled Keywords:Corneal topography, Intraoperative complications of cataract surgery, Intraocular lens calculation for primary/secondary intraocular lens, Intraocular lenses, Lens/cataract, Optics/refraction/instruments
Subjects:Medical sciences > Medicine > Surgery
Medical sciences > Optics > Optometry
Medical sciences > Optics > Visual perception
ID Code:60972
Deposited On:20 Jun 2020 16:22
Last Modified:20 Jun 2020 16:22

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