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Keywords = bifocal contact lens

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14 pages, 2076 KiB  
Systematic Review
Systematic Review of Myopia Progression after Cessation of Optical Interventions for Myopia Control
by Yu-Chieh Chiu, Ping-Chiao Tsai, Ssu-Hsien Lee, Jen-Hung Wang and Cheng-Jen Chiu
J. Clin. Med. 2024, 13(1), 53; https://doi.org/10.3390/jcm13010053 - 21 Dec 2023
Cited by 6 | Viewed by 4268
Abstract
Despite high discontinuation rates for myopia optical interventions, limited attention has been given to the potential rebound effects post-discontinuation. This systematic review aims to assess the extent of the rebound effects following the cessation of common clinical optical myopia-control interventions in children. A [...] Read more.
Despite high discontinuation rates for myopia optical interventions, limited attention has been given to the potential rebound effects post-discontinuation. This systematic review aims to assess the extent of the rebound effects following the cessation of common clinical optical myopia-control interventions in children. A comprehensive search of PubMed, Embase, Cochrane CENTRAL, and ClinicalTrials.gov was conducted from inception to October 2023. The rebound effects, defined as changes in the axial length or spherical equivalent during and after treatment cessation, were categorized into four levels. These studies encompassed 703 participants and spanned from 2019 to 2023, with durations of treatment and cessation ranging from 6 months to 3.5 years and from 2 weeks to 5 years, respectively. This review, encompassing 14 studies, revealed a predominant strong rebound effect in orthokeratology (8 studies), a weak rebound effect in multifocal soft contact lenses (4 studies), and a variable rebound effect in peripheral-plus spectacle lenses (2 studies). Notably, with the increasing cessation duration, the rebound effects diminished, potentially linked to the reversal of choroidal thickening and the disappearance of peripheral myopic defocus. In conclusion, a temporal trend of rebound effects exists in all three myopia optical interventions, possibly contributing to their myopia control mechanisms. Full article
(This article belongs to the Special Issue Advanced Research in Myopia and Other Visual Disorders)
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24 pages, 5292 KiB  
Review
Switchable Liquid Crystal Contact Lenses for the Correction of Presbyopia
by James Bailey, Philip B. Morgan, Helen F. Gleeson and J. Cliff Jones
Crystals 2018, 8(1), 29; https://doi.org/10.3390/cryst8010029 - 12 Jan 2018
Cited by 56 | Viewed by 16386
Abstract
Presbyopia is an age-related disorder where the lens of the eye hardens so that focusing on near objects becomes increasingly difficult. This complaint affects everyone over the age of 50. It is becoming progressively more relevant, as the average age of the global [...] Read more.
Presbyopia is an age-related disorder where the lens of the eye hardens so that focusing on near objects becomes increasingly difficult. This complaint affects everyone over the age of 50. It is becoming progressively more relevant, as the average age of the global population continues to rise. Bifocal or varifocal spectacles are currently the best solution for those that require near and far vision correction. However, many people prefer not to wear spectacles and while multifocal contact lenses are available, they are not widely prescribed and can require significant adaptation by wearers. One possible solution is to use liquid crystal contact lenses that can change focal power by applying a small electric field across the device. However, the design of these contact lenses must be carefully considered as they must be comfortable for the user to wear and able to provide the required change in focal power (usually about +2D). Progress towards different lens designs, which includes lens geometry, liquid crystal choices and suitable alignment modes, are reviewed. Furthermore, we also discuss suitable electrode materials, possible power sources and suggest some methods for switching the lenses between near and far vision correction. Full article
(This article belongs to the Section Liquid Crystals)
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