Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2022 Mar 8;13(4):1948-1967.
doi: 10.1364/BOE.447045. eCollection 2022 Apr 1.

Effect of decentration, tilt and rotation on the optical quality of various toric intraocular lens designs: a numerical and experimental study

Jesús Pérez-Gracia  1 , Jorge Ares  1 , Francisco J Ávila  1 , Laura Remón  1
Affiliations

Effect of decentration, tilt and rotation on the optical quality of various toric intraocular lens designs: a numerical and experimental study

Jesús Pérez-Gracia et al. Biomed Opt Express. .

Abstract

Toric intraocular lenses (T-IOLs) may lose their optical quality if they are not correctly positioned inside the capsular bag once implanted. In this work, T-IOLs with cylinder powers of +1.50, +4.50 and +7.50 D and differing degrees of spherical aberration have been designed, manufactured and tested in vitro using a commercial optical bench that complies with the requirements of standard ISO 11979-2. Moreover, the effect of tilt and rotation on optical quality was assessed by means of numerical ray tracing on an astigmatic eye model, while the effect of decentration was evaluated numerically and experimentally.

PubMed Disclaimer

Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Fig. 1.
Fig. 1.
Numerical MTF-Y (continuous line) and MTF-X (dashed line) values for the different T-IOL designs as a function of decentration, with a 3.00 mm pupil diameter and 100 cycles/mm for the different cylinder diopters. The yellow background represents a T-IOL decentration in the Y-axis direction, the grey background represents a decentration in the X-axis direction. The horizontal black line represents an MTF value of 0.43, the tolerance limit established in ISO 11979-2 [17].
Fig. 2.
Fig. 2.
Numerical MTF-Y (continuous line) and MTF-X (dashed line) values for the different T-IOL designs as a function of tilt, with a 3.00 mm pupil diameter and 100 cycles/mm for the different cylinder diopters. The yellow background represents a T-IOL tilt in the Y-axis direction, the grey background represents a tilt in the X-axis direction. The horizontal black line represents an MTF value of 0.43, the tolerance limit established in ISO 11979-2 [17].
Fig. 3.
Fig. 3.
Numerical MTF-Y (continuous line) and MTF-X (dashed line) values for the different T-IOL designs as a function of rotation, with a 3.00 mm pupil diameter and 100 cycles/mm for the different cylinder diopters. The yellow background represents a T-IOL rotation in the negative direction, the grey background represents a rotation in the positive rotation. The horizontal black line represents an MTF value of 0.43, the tolerance limit established in ISO 11979-2 [17].
Fig. 4.
Fig. 4.
Numerical results for RMS defocus, astigmatism and coma for decentrations with the different T-IOL designs and a +4.50 D cylinder, measured with a 3.00 mm diameter pupil. The white background represents the on-axis RMS values, the yellow background represents a T-IOL decentration in the Y-axis direction and the grey background a decentration in the X-axis direction.
Fig. 5.
Fig. 5.
Numerical results of the RMS defocus, astigmatism and coma for tilt for the different T-IOL designs with a +4.50 D cylinder, measured with a 3.00 mm diameter pupil. The white background represents the on-axis RMS values, the yellow background represents a T-IOL tilt in the Y-axis direction, and the grey background a tilt in the X-axis direction.
Fig. 6.
Fig. 6.
Numerical results of the RMS astigmatism for the different T-IOL designs for each cylinder upon rotation, measured with a 3.00 mm diameter pupil. The white background represents the on-axis RMS values, the yellow background represents a T-IOL rotation in the negative direction, and the grey background a rotation in the positive direction.
Fig. 7.
Fig. 7.
Experimental MTF-Y (continuous line) and MTF-X (dashed line) values for the different T-IOL designs as a function of decentration, with a 3.00 mm pupil diameter and 100 cycles/mm for the different cylinder diopters. Testing was performed in vitro using the PMTF optical bench. Decentration was applied in the vertical direction (left side of the graph) and the horizontal direction (right side of the graph). The horizontal line represents an MTF value of 0.43, the tolerance limit established in ISO 11979-2 [17].
Fig. 8.
Fig. 8.
Experimental TF-MTF (3.00 mm pupil diameter and 100 cycles/mm) for the different T-IOL designs manufactured in the on-axis position, as tested in vitro using the PMTF optical bench. TF-MTF-X (dashed lines) TF-MTF-Y (continuous lines). The results for different cylinder diopters are shown on each graph. For the T-IOLs with +1.50 D CYL, axial scanning was performed from 18.00 to 22.00 D. For the T-IOLs with +4.50 D CYL, axial scanning was performed from 16.50 to 23.00 D, and for the T-IOLs with +7.50 D CYL, axial scanning was performed from 15.25 to 24.50 D. The horizontal line represents an MTF value of 0.43, the tolerance limit established in ISO 11979-2 [17].
See this image and copyright information in PMC

Similar articles

See all similar articles

Cited by

References

    1. Poler S., “Intraocular lens with astigmatism correction,” U.S. patent, 4,277,852A (21 January 1981).
    1. Kessel L., Andresen J., Tendal B., Erngaard D., Flesner P., Hjortdal J., “Toric Intraocular lenses in the correction of astigmatism during cataract surgery: a systematic review and meta-analysis,” Ophthalmology (Philadelphia) 123(2), 275–286 (2016).10.1016/j.ophtha.2015.10.002 - DOI - PubMed
    1. Shimizu K., Misawa A., Suzuki Y., “Toric intraocular lenses: correcting astigmatism while controlling axis shift,” J. Cataract Refractive Surg. 20(5), 523–526 (1994).10.1016/S0886-3350(13)80232-5 - DOI - PubMed
    1. Lieberman D.M., “Method of offsetting postoperative astigmatism with an intraocular lens,” U.S. patent, 4,512,039A (24 May 1985).
    1. Nielsen P.J., “Prospective evaluation of surgically induced astigmatism and astigmatic keratotomy effects of various self-sealing small incisions,” J. Cataract Refractive Surg. 21(1), 43–48 (1995).10.1016/S0886-3350(13)80478-6 - DOI - PubMed

LinkOut - more resources