José Ignacio Fernández-Vigo1, Ana Macarro-Merino2, Joaquín Fernández-Francos3, Lucía De-Pablo-Gómez-de-Liaño2, José María Martínez-de-la-Casa4, Julián García-Feijóo4, José Ángel Fernández-Vigo5. 1. Hospital Universitario Clínico San Carlos, Servicio de Oftalmología, Instituto de Investigación Sanitaria San Carlos (IdISSC), Madrid, Spain 2Centro internacional de oftalmología avanzada, Madrid, Spain. 2. Centro internacional de oftalmología avanzada, Madrid, Spain. 3. Departamento de Energía, Universidad de Oviedo, Oviedo, Spain. 4. Hospital Universitario Clínico San Carlos, Servicio de Oftalmología, Instituto de Investigación Sanitaria San Carlos (IdISSC), Madrid, Spain. 5. Centro internacional de oftalmología avanzada, Madrid, Spain 4Departamento de Oftalmología, Universidad de Extremadura, Badajoz, Spain.
Abstract
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.
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.
Authors: José Ignacio Fernández-Vigo; Alfonso C Marcos; Rafael Agujetas; José María Montanero; Inés Sánchez-Guillén; Julián García-Feijóo; Adrián Pandal-Blanco; José Ángel Fernández-Vigo; Ana Macarro-Merino Journal: PLoS One Date: 2018-08-13 Impact factor: 3.240
Authors: Belén Alfonso-Bartolozzi; Carlos Lisa; Luis Fernández-Vega-Cueto; Begoña Baamonde; David Madrid-Costa; José F Alfonso Journal: Eye Vis (Lond) Date: 2022-09-07