Bevel toric multicurve rigid gas-permeable lens for keratoconus

Yanai, Ryoji; Ueda, Kayo; Sonoda, Koh Hei

doi:10.1007/s10384-012-0216-6

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…In previous studies on multi-curve HCLs, the HCLs were not designed to have a flat peripheral zone curve; however, the BCVA, duration of HCL wear, and HCL wearing success rates were better than those obtained in this study [17][18][19]. The reason for the poor result of multicurve HCLs in our study may be that most multi-curve HCLs were used for stage 4 cases.…”

Section: Plos Onecontrasting

confidence: 64%

“…Higher-order aberrations and contrast sensitivity function were evaluated during HCL wear in some previous studies. Yanai et al [ 18 ] reported no significant difference in higher-order aberrations before and during HCL use. In contrast, Negishi et al [ 20 ] reported that ocular higher-order aberrations increased during HCL wear for keratoconus even when corrected visual acuity was good.…”

Section: Discussionmentioning

confidence: 99%

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Clinical evaluation of flat peripheral curve design with aspherical-curve and multi-curve hard contact lenses for keratoconus

et al. 2022

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Aspherical- and multi-curve rigid gas-permeable hard contact lenses (HCLs) have a flattened curve in the peripheral zone and are mostly used for patients with keratoconus who cannot wear glasses, soft contact lenses, or spherical HCLs. In this retrospective study, a total of 95 eyes of 77 patients who used aspherical- or multi-curve HCLs (mean age: 40.0 ± 11.0 years) were evaluated. This study examined the types of aspherical- and multi-curve HCLs, best-corrected visual acuity (BCVA) values before and after wearing HCLs, the association with the Amsler-Krumeich classification, duration of wear, corneal/conjunctival disorder, and the frequency of changing HCLs. There were 78 eyes that used aspherical-curve HCLs and 17 that used multi-curve HCLs. BCVA significantly improved from 0.42 logMAR to 0.06 logMAR after wearing either form of HCL. The Amsler-Krumeich classification showed that aspherical-curve HCLs were commonly used for patients with stage 2 keratoconus, and multi-curve HCLs were commonly used for stage 4 patients. The BCVA values were worse when the disease stage was more severe (stages 3 and 4) regardless of HCL type. The mean base curve of the lenses was steeper in multi-curve HCLs than in aspherical-curve HCLs. The more severe the disease stage, the steeper the base curve in both aspherical- and multi-curve HCLs. The duration of wear significantly improved from 2.1 h to 10.2 h, and corneal/conjunctival disorder similarly improved. The mean frequency of changing HCL types was 1.1 times. This study suggests that a flat peripheral curve design with aspherical- and multi-curve HCLs is useful for patients with keratoconus.

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Section: Plos Onecontrasting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Clinical evaluation of flat peripheral curve design with aspherical-curve and multi-curve hard contact lenses for keratoconus

et al. 2022

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“…Most studies that have evaluated rigid lens correction with corneal lenses in keratoconus have analysed retrospective data in well‐defined clinical populations. These reports provide useful information regarding the range of corneal lens designs that have been utilised in clinical practice; however, objective comparisons are limited by the absence of a control group and/or clearly defined criteria regarding the definition of a successful rigid lens fit. As such, there is currently a lack of high‐quality, controlled prospective clinical trial evidence to provide guidance with regard to the relative merit of different proprietary lens designs.…”

Section: Contact Lens Modalities For Keratoconusmentioning

confidence: 99%

Contact lens management of keratoconus

Downie

Lindsay²

2015

Clinical and Experimental Optometry

133

103

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Contact lenses are the primary form of visual correction for patients with keratoconus. Contemporary advances in contact lens designs and materials have significantly expanded the available fitting options for patients with corneal ectasia. Furthermore, imaging technology, such as corneal topography and anterior segment optical coherence tomography, can be applied to both gain insight into corneal microstructural changes and to guide contact lens fitting. This paper provides a comprehensive review of the range of contact lens modalities, including soft lenses, hybrid designs, rigid lenses, piggyback configurations, corneo-scleral, mini-scleral and scleral lenses that are currently available for the optical management of keratoconus. The review also discusses the importance of monitoring for disease progression in patients with keratoconus, in particular children, who tend to undergo more rapid progressive changes, so as to facilitate appropriate modification to contact lens fitting and/ or potential referral for corneal collagen cross-linking treatment, as appropriate.

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“…Despite the various lens designs of corneal GPs such as spherical, aspheric, multicurve, peripheral toric, 11 and reverse geometry design 12 that are commercially available, the most used for keratoconus is probably the multicurve lenses. The design of the multicurve lens mimics the shape of the cornea in eyes with keratoconus and is designed so that the curvature in the center of the lens is steep, but the curvature becomes flatter toward the periphery.…”

Section: Major Fitting Strategy Of Rigid Gas-permeable Lens Prescriptionmentioning

confidence: 99%

Management of Keratoconus With Corneal Rigid Gas-Permeable Contact Lenses

Itoi

2022

Eye &Amp; Contact Lens: Science &Amp; Clinical Practice

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Vision correction using a corneal rigid gas-permeable contact lens, which is relatively safe, easy to replace, and economical, is still the basis of the management for keratoconus. For eyes with keratoconus, two fitting strategies have traditionally been used in Japan: apical touch fitting with spherical lenses and parallel fitting with multicurve lenses. These two techniques have different success rates depending on the type and severity of keratoconus. Therefore, it is important to classify eyes with keratoconus into four types according to the shape of the cornea and select the prescription techniques according to this classification. If the corneal GPs prescribed by these fitting methods cannot be used because of mechanical irritation to the corneal epithelium, the "piggyback lens system" is an effective option. Furthermore, proper lens care must be instructed to patients to prevent contact lens-related complications and maintain visual function. If these fittings and introductions can be performed properly, corneal GPs can safely provide effective and comfortable vision for many patients with keratoconus, even for those with severe keratoconus.

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Bevel toric multicurve rigid gas-permeable lens for keratoconus

Abstract: Fitting of Twinbel bevel toric improved visual acuity in eyes affected by keratoconus, thus providing a viable alternative for management of such eyes.

Cited by 7 publications

References 38 publications

Clinical evaluation of flat peripheral curve design with aspherical-curve and multi-curve hard contact lenses for keratoconus

Clinical evaluation of flat peripheral curve design with aspherical-curve and multi-curve hard contact lenses for keratoconus

Contact lens management of keratoconus

Management of Keratoconus With Corneal Rigid Gas-Permeable Contact Lenses

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