Myopie de l’enfant

Brémond‐Gignac, Dominique

doi:10.1051/medsci/2020131

Cited by 39 publications

(21 citation statements)

References 16 publications

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“…Currently all the existing theoretical hypotheses that the ortho-k lens controls myopia progression, such as the retinal peripheral defocus theory (Gardner et al, 2015;Smith et al, 2020), the aberration theory (Hiraoka et al, 2015;Zhang X. et al, 2020;Lau et al, 2020), and the accommodation theory (Batres et al, 2020;Song et al, 2021), are based on the change of the corneal shape or reduction of the refractive error after ortho-k lens wear. The biomechanical interaction between the lens and the cornea or the entire eyeball is vitally important in the course of ortho-k treatment.…”

Section: Discussionmentioning

confidence: 99%

“…The rapidly growing myopic prevalence has sparked intense research interest in the methods of myopia control ( Cho and Cheung, 2012 ; Gonzalez-Meijome et al, 2016 ; Bremond-Gignac, 2020 ; Bullimore and Johnson, 2020 ). Ortho-k, a most promising treatment approach to slow down myopia progression, is gaining popularity among myopic patients due to its effectiveness and convenience.…”

Section: Discussionmentioning

confidence: 99%

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The Biomechanical Response of the Cornea in Orthokeratology

Fang

et al. 2021

Front. Bioeng. Biotechnol.

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Orthokeratology has been widely used to control myopia, but the mechanism is still unknown. To further investigate the underlying mechanism of corneal reshaping using orthokeratology lenses via the finite element method, numerical models with different corneal curvatures, corneal thicknesses, and myopia reduction degrees had been developed and validated to simulate the corneal response and quantify the changes in maximum stress in the central and peripheral corneal areas during orthokeratology. The influence of the factors on corneal response had been analyzed by using median quantile regression. A partial eta squared value in analysis of variance models was established to compare the effect size of these factors. The results showed central and peripheral corneal stress responses changed significantly with increased myopia reduction, corneal curvature, and corneal thickness. The target myopia reduction had the greatest effect on the central corneal stress value (partial eta square = 0.9382), followed by corneal curvature (partial eta square = 0.5650) and corneal thickness (partial eta square = 0.1975). The corneal curvature had the greatest effect on the peripheral corneal stress value (partial eta square = 0.5220), followed by myopia reduction (partial eta square = 0.2375) and corneal thickness (partial eta square = 0.1972). In summary, the biomechanical response of the cornea varies significantly with the change in corneal conditions and lens designs. Therefore, the orthokeratology lens design and the lens fitting process should be taken into consideration in clinical practice, especially for patients with high myopia and steep corneas.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Biomechanical Response of the Cornea in Orthokeratology

Fang

et al. 2021

Front. Bioeng. Biotechnol.

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“…The mechanism of myopia was not fully understood, and most scholars believe that myopia is related to visual environment, behavior, and genetics [ 27 ]. Behavioral adjustment is considered the main cause of myopia in adolescents in the growth and development stage [ 28 ].…”

Section: Discussionmentioning

confidence: 99%

Comparisons of Three Methods for Myopia Control in Adolescents

Fang

Tan

et al. 2022

Journal of Ophthalmology

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Objective. A rising trend in electronic use has increased the prevalence of myopia in adolescents, but the optimal approach to controlling myopia remains undetermined. Here, we explored the effects of common single vision (SV) spectacle lenses combined with 0.01% atropine eye drops (SV + A), orthokeratology (OK) lenses, and peripheral defocus (PD) spectacle lenses on myopia control in adolescents. Methods. Totally 150 myopic adolescent patients (300 eyes) receiving treatment at The First People’s Hospital of Chenzhou City were enrolled. According to doctors’ advice and guardians’ wishes, the patients were divided into SV + A group, OK group, and PD group, with each group consisting of 50 cases (100 eyes). The spherical equivalent, axial length, accommodative response index (accommodative sensitivity and accommodative lag), and intraocular pressure were compared before and after 12 months of wearing lenses, and the complications were recorded. Results. Before wearing lenses, there was no statistical significance in baseline characteristics such as age, gender, and spherical equivalent among the three groups ( P > 0.05 ). After wearing lenses, the increase in spherical equivalent and axial length in the SV + A and OK groups were lower than in the PD group ( P < 0.05 ), and the SV + A group had the lowest axial length growth. Compared with the SV + A group, accommodative sensitivity was much higher and accommodative lag was significantly lower in the OK and PD groups ( P < 0.01 ). In addition, there was no significant difference in intraocular pressure before and after wearing lenses among the three groups ( P > 0.05 ). Though the OK group patients had more complications, the difference was not statistically significant ( P > 0.05 ). Conclusion. SV + A, OK, and PD lenses can effectively control the progression of myopia in adolescents, but SV + A and OK lenses exhibited more significant effects.

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“…Myopia is mainly related to axial growth (axial myopia), but a small proportion of myopia is caused by excessive curvature of the cornea or lens (refractive myopia), such as keratoconus [2]. In general, spherical equivalent (SE) B -0.5 diopters (D) is the standard for the diagnosis of myopia, and an SE B -5.0 D or -6.0 D or an axial length of greater than 26 mm is considered indicative of high myopia [3,4]. Myopia is a multifactorial disorder that is complex, and it is difficult to explain its mechanism, which is regulated by both environmental and genetic factors [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Light Signaling and Myopia Development: A Review

Zhang

Zhu

2022

Ophthalmol Ther

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Introduction:The aim of this article was to comprehensively review the relationship between light exposure and myopia with a focus on the effects of the light wavelength, illuminance, and contrast on the occurrence and progression of myopia. Methods: This review was performed by searching PubMed data sets including research articles and reviews utilizing the terms ''light'', ''myopia'', ''refractive error'', and ''illuminance'', and the review was concluded in November 2021. Myopia onset and progression were closely linked with emmetropization and hyperopia. To better elucidate the mechanism of myopia, some of the articles that focused on this topic were included. This article is based on previously conducted studies and does not contain any new studies with human participants or animals performed by any of the authors. Results: The pathogenesis and prevention of myopia are not completely clear. Studies have provided evidence supporting the idea that light could affect eye growth in three ways. Changing the corresponding conditions will cause changes in the growth rate and mode of the eyes, and preliminary results have shown that FR/NIR (far red/near-infrared) light is effective for myopia in juveniles. Conclusion: This review discusses the results of studies on the effects of light exposure on myopia with the aims of providing clues and a theoretical basis for the use of light to control the development of myopia and offering new ideas for subsequent studies.

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Myopie de l’enfant

Cited by 39 publications

References 16 publications

The Biomechanical Response of the Cornea in Orthokeratology

The Biomechanical Response of the Cornea in Orthokeratology

Comparisons of Three Methods for Myopia Control in Adolescents

Light Signaling and Myopia Development: A Review

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