Iris-fixated aphakic intraocular lenses (IFIOL) are used in cataract surgery when more common intraocular lenses (IOL) cannot be adopted because of the absence of capsular bag support. These lenses can be implanted on either the posterior or the anterior surface of the iris. In this work, we study whether one of these options is preferable over the other from the mechanical point of view. In particular, we focus on the forces that the IFIOL transmits to the iris, which are associated with the risk of lens dislocation. We study the problem numerically and consider aqueous flow induced by saccadic rotations in the cases of an IFIOL in the anterior and posterior sides of the iris. The considered IFIOL is the Artisan Aphakia +30.0 D lens (IFIOL) produced by Ophtec BV. We perform the simulations in openfoam. We find that the forces transmitted by the aphakic IFIOL to the iris are significantly higher in the case of posterior implantation. This suggests that lens implantation on the posterior surface of the iris might be associated with a higher risk of lens dislocation, when an inadequate amount of iris tissue is enclavated during implantation.
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November 2018
Research-Article
A Study of the Mechanical Forces on Aphakic Iris-Fixated Intraocular Lenses
Peyman Davvalo Khongar,
Peyman Davvalo Khongar
Department of Civil,
Chemical and Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: peyman.davvalo.khongar@edu.unige.it
Chemical and Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: peyman.davvalo.khongar@edu.unige.it
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Jan Oscar Pralits,
Jan Oscar Pralits
Department of Civil,
Chemical and Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: jan.pralits@unige.it
Chemical and Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: jan.pralits@unige.it
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Mario Romano,
Mario Romano
Department of Biomedical Sciences,
Humanitas University,
Rozzano,
Milano 20090, Italy
e-mail: mario.romano@hunimed.eu
Humanitas University,
Rozzano,
Milano 20090, Italy
e-mail: mario.romano@hunimed.eu
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Rodolfo Repetto
Rodolfo Repetto
Department of Civil, Chemical and
Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: rodolfo.repetto@unige.it
Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: rodolfo.repetto@unige.it
Search for other works by this author on:
Peyman Davvalo Khongar
Department of Civil,
Chemical and Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: peyman.davvalo.khongar@edu.unige.it
Chemical and Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: peyman.davvalo.khongar@edu.unige.it
Jan Oscar Pralits
Department of Civil,
Chemical and Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: jan.pralits@unige.it
Chemical and Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: jan.pralits@unige.it
Paolo Soleri
Mario Romano
Department of Biomedical Sciences,
Humanitas University,
Rozzano,
Milano 20090, Italy
e-mail: mario.romano@hunimed.eu
Humanitas University,
Rozzano,
Milano 20090, Italy
e-mail: mario.romano@hunimed.eu
Rodolfo Repetto
Department of Civil, Chemical and
Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: rodolfo.repetto@unige.it
Environmental Engineering,
University of Genoa,
Genoa 16145, Italy
e-mail: rodolfo.repetto@unige.it
Manuscript received February 21, 2018; final manuscript received June 7, 2018; published online August 20, 2018. Assoc. Editor: Anna Pandolfi.
J Biomech Eng. Nov 2018, 140(11): 111009 (8 pages)
Published Online: August 20, 2018
Article history
Received:
February 21, 2018
Revised:
June 7, 2018
Citation
Khongar, P. D., Pralits, J. O., Soleri, P., Romano, M., and Repetto, R. (August 20, 2018). "A Study of the Mechanical Forces on Aphakic Iris-Fixated Intraocular Lenses." ASME. J Biomech Eng. November 2018; 140(11): 111009. https://doi.org/10.1115/1.4040588
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