Noncontact intraocular pressure reading prediction after Laser‐assisted <i>in situ</i> Keratomileusis by the finite element method

Ou, Chung-Ming; Sun, Han-Yin

doi:10.1002/cnm.2513

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…The outcome of implementing this kind of approach in different applications has proven to be a success. Incorporating numerical models in techniques for the treatment of eye diseases, such as insertion of GDDs, can aid medical doctors to implement curing methods in humans …”

Section: Introductionmentioning

confidence: 99%

“…Incorporating numerical models in techniques for the treatment of eye diseases, such as insertion of GDDs, can aid medical doctors to implement curing methods in humans. [7][8][9][10][11][12][13][14][15][16][17] Previous studies carried out on glaucoma filtration surgery and GDDs prove that there is an actual interest in this field. [18][19][20][21][22][23] In the study of Kara et al, 18 numerical simulations have been carried out on Ahmed glaucoma valve, observing reverse flow and fluctuation in pressure control.…”

Section: Introductionmentioning

confidence: 99%

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A novel patient‐oriented numerical procedure for glaucoma drainage devices

Mauro

Massarotti

Mohamed

et al. 2018

Numer Methods Biomed Eng

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The present work analyses the performance of four glaucoma drainage devices, by means of a novel patient-oriented numerical procedure. The procedure is based on the three-dimensional geometry reconstruction from the stacks of tomographic images of a human eye, at different angles, on meshing and on thermo-fluid dynamics modelling activities, carried out on the reconstructed computational domain. The current three-dimensional eye model considers anterior chamber (AC), trabecular meshwork, Schlemm's canal, and collector channels, making use of generalised porous medium approach for modelling ocular porous tissue and cavities. The intraocular pressure (IOP) management inside AC of human eye is analysed, by comparing the results obtained for four drainage devices implanted in a human eye for glaucoma treatment, ie, ExPRESS shunt, iStent inject, SOLX gold micro shunt, and the novel silicon shunt device. The numerical results allow predicting the effects of the installation of these implants on human eyes, in terms of IOP decrease, aqueous humour velocity, pressure, friction coefficient, and local Nusselt number, pointing out the clear distinction between pre-operative and post-operative eye conditions for different glaucoma surgical techniques.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel patient‐oriented numerical procedure for glaucoma drainage devices

Mauro

Massarotti

Mohamed

et al. 2018

Numer Methods Biomed Eng

View full text Add to dashboard Cite

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Solid‐state laser (266 nm) as an alternative to ArF excimer laser (193 nm) for corneal reshaping: Comparative numerical study of the thermal effect

Abdelhalim,

Hassan,

Abdelkawi

et al. 2024

Numer Methods Biomed Eng

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Laser corneal reshaping is a safe and effective technique utilized to treat common vision disorders. An advanced laser delivery system equipped with a pulsed UV laser with specific parameters is used to ablate parts of the cornea surface to correct the existing refractive error. The argon fluoride (ArF) excimer pulsed gas laser at 193 nm is the most employed type in the commercial devices for such treatments. This laser is generated using a mixture of Argon, Fluorine, and a significant amount of Neon gases. However, due to the ongoing Russian‐Ukraine war, the availability of Neon gas is currently very limited, as this region is considered the primary supplier of pure Neon gas. Consequently we suggest replacing the common ArF laser source in the commercial devices with a solid‐state (forth harmonic neodymium‐doped yttrium aluminum garnet laser at 266 nm). This replacement uses the same operation parameters, optics, and scanning algorithm. Parameters from five commercial devices (Zeiss MEL 90, Technolas TENEO 317, Alcon Wave Light EX 500, Schwind Amaris 750 s, OptoSystems MICROSCAN VISUM) were compared with those of the i‐ablation device, a research device that uses a 266 nm laser source. Our goal is to reduce production costs through a simple modification that has a significant impact. Consequently, the present study aims to find an alternative laser source for the current ArF laser without exchanging the complete system's design. This recommendation is based on a numerical simulation study. The thermal effect on a human cornea model was numerically evaluated using finite‐element solutions of Pennes' bioheat equation on the COMSOL platform by applying two laser wavelengths. The results demonstrated that changing the laser source significantly impacts the thermal effect, even with the same laser settings. All studied devices showed a reduction in the thermal effect to below 40°C, compared with nearly 100°C under ordinary conditions.

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Noncontact intraocular pressure reading prediction after Laser‐assisted in situ Keratomileusis by the finite element method

Cited by 2 publications

References 14 publications

A novel patient‐oriented numerical procedure for glaucoma drainage devices

A novel patient‐oriented numerical procedure for glaucoma drainage devices

Solid‐state laser (266 nm) as an alternative to ArF excimer laser (193 nm) for corneal reshaping: Comparative numerical study of the thermal effect

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