Computational Study of Aqueous Humor Dynamics Assessing the Vault and the Pupil Diameter in Two Posterior-Chamber Phakic Lenses

Purpose: To compare the behavior of aqueous humor (AH) and analyze flow differences by comparing the volume and velocity of the flow after two different models of implantable collamer lens (ICL) placement. Methods: Computational fluid dynamics with numerical simulation using Ansys Fluent software wa...

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Bibliographic Details
Authors: Fernández Vigo, José Ignacio, Macarro Merino, Ana, Fernández Francos, Joaquín, De Pablo Gómez de Liaño, Lucía, Martínez De La Casa Fernández-Borrella, José María, García Feijoo, Julián, Fernández Vigo, José Ángel
Format: article
Publication Date:2016
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/18023
Online Access:https://hdl.handle.net/20.500.14352/18023
Access Level:Open access
Keyword:617.7-089.243
617.74
Aqueous humor
Phakic lens
Iridotomy
Lens vault
Computational modeling
Cirugía
Oftalmología
Optometría
3213 Cirugía
3201.09 Oftalmología
2209.15 Optometría
Description
Summary:Purpose: To compare the behavior of aqueous humor (AH) and analyze flow differences by comparing the volume and velocity of the flow after two different models of implantable collamer lens (ICL) placement. Methods: Computational fluid dynamics with numerical simulation using Ansys Fluent software was performed to compare the AH flow through a peripheral iridotomy (PI), which is typically performed after implantation of a V4b lens to the central hole of a V4c lens. The volume and flow rate in 24 scenarios were compared according to the type of lens, pupil diameter (PD) (3.5 or 5.5 mm), the vault (100, 350, and 800 μm) and the PI (single or double, 180 or 360 μm). Results: With a standard vault (350 μm) and a PD of 3.5 mm, the volume of AH that flows from the posterior to the anterior chamber through the PI (V4b lens: 73.4% in 360 μm and 17.3% in 180 μm) and for the central hole (V4c lens: 75.7%) is larger than in the case of a PD of 5.5 mm (13.9%, 0.91%, and 15.3% respectively). When the vault is low (100; PD 3.5 mm), the volume of AH that reaches the central hole of the V4c lens is diminished (52.0%), being 5.1% if the pupil is enlarged. Conclusions: AH flow varies depending on the type of ICL implanted, whether it is implanted with an iridotomy or a central hole on the lens, the PD, and the vault.

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