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. 2023 Jun 9;13(1):9437.
doi: 10.1038/s41598-023-36694-0.

Evaluation of the mechanical stability of intraocular lenses using digital image correlation

Iulen Cabeza-Gil  1 , Javier Frechilla  2 , Begoña Calvo  2   3
Affiliations

Evaluation of the mechanical stability of intraocular lenses using digital image correlation

Iulen Cabeza-Gil et al. Sci Rep. .

Abstract

This study aimed to evaluate the mechanical stability of seven different intraocular lens (IOL) haptic designs by using digital image correlation to measure their mechanical biomarkers (axial displacement, tilt, and rotation) under quasi-static compression. The IOLs were compressed between two clamps from 11.00 up to 9.50 mm whilst a 3D deformation dataset was acquired every 0.04 mm. Results revealed that flexible and mixed IOL designs exhibited better mechanical response for smaller compression diameters compared to stiff designs. Conversely, stiff designs performed better for larger compression diameters. These findings may aid in the selection and development of more mechanically stable IOL designs.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Outline of the effect of the mechanical stability of the IOL in the optical performance.
Figure 2
Figure 2
Setup of the experimental tests.
Figure 3
Figure 3
Post-processing DIC method to obtain the mechanical biomarkers of the IOL in the compression test. The speckle pattern from the IOL (a, b) is filtered to obtain the IOL optics. (c) C, P, Q, R, and S points are used to calculate the mechanical biomarkers. (d) IOL area of interest to quantify biomarkers.
Figure 4
Figure 4
Control tests. (a) Axial displacement. (b) Rotation.
Figure 5
Figure 5
Plan view of the reference (øcomp = 11.00 mm) and deformed state (øcomp = 9.50 mm) of the seven IOLs under investigation.
Figure 6
Figure 6
Axial displacement and tilt in the compression tests of the (A) AT LISA and (B) Acrysof MA60BM IOL models.
Figure 7
Figure 7
Axial displacement and tilt in the compression tests of the following IOL models: (A) AcrySof IQ SN6CWS, (B) Akreos AO, (C) Physiol POD F GF, (D) Bi-Flex and (E) Tecnis.
Figure 8
Figure 8
Change in the axial displacement and tilt (mean and std) during the last 50 s of the tests where the IOLs are compressed at 9.5 mm.
Figure 9
Figure 9
Axial displacement and tilt (mean and std) at the compression diameter of 9.50 mm according to the IOL material (a) and haptic design (b). The haptic design classification was divided into flexible (AcrySof IQ SN6CWS, Bi-Flex and Tecnis), mixed (Akreos AO and Physiol POD F GF) and stiff designs (AT LISA and AcrySof MA60BM).
See this image and copyright information in PMC

References

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