Centration and Decentration of Contact Lenses during Peripheral Gaze

El-Nimri, Nevin W.; Walline, Jeffrey J.

doi:10.1097/opx.0000000000001127

Cited by 11 publications

(11 citation statements)

References 26 publications

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“…This would contribute positively to the quality of vision and efficacy of the lens. 41,42 While we could not evaluate the impact of the reverse geometry on the peripheral defocus produced, this issue will be addressed in future work.…”

Section: Discussionmentioning

confidence: 99%

Efficacy and safety of a soft contact lens to control myopia progression

Valle

Blázquez²,

Gros-Otero

et al. 2021

Clinical and Experimental Optometry

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Clinical relevance:The control of myopia progression is currently considered an evidence-based therapeutic need. Background: To determine the efficacy and safety of the Esencia lens, a new soft contact lens (SCL) designed to slow down myopia progression in paediatric patients. Methods: This study was a randomised, parallel, double-masked clinical trial. Seventy myopic (−0.50 to −8.75 D) boys and girls, 7-15-years of age, were randomised and allocated to one of two groups: (i) study (n = 36) or (ii) control (n = 34). Study group patients were given the Esencia lens, a progressive multifocal and reverse geometry SCL. Control group patients were given conventional SCLs. Efficacy measurements (change in cycloplegic autorefraction and axial length) were measured at baseline and at the six-month intervals over a 12-month period. Visual performance measurements were corneal power, comfort, quality of vision and contact lens fitting. Safety measures included detection of adverse events. Results: Mean changes in cycloplegic autorefraction after 12-months were −0.28 ± 0.35 D for study and −0.57 ± 0.52 D for control group patients (p = 0.02). A significantly lower increase in axial length was found in the study group (0.13 ± 0.12-mm) compared to control (0.22 ± 0.14-mm) patients (p = 0.03). Compared to control group patients, there was less myopia progression in the study group: 51 and 41 per cent in terms of cycloplegic autorefraction and axial length, respectively. No significant differences between groups for change in corneal power, comfort, vision quality and contact lens fitting were found (p > 0.05). Regarding safety, there were no serious and/or unexpected adverse events during the study. Conclusions: The Esencia lens seems to be efficacious in slowing down progression of myopia in children compared to traditional SCLs in the short term, with comparable safety features and visual outcomes.

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Section: Discussionmentioning

confidence: 99%

Efficacy and safety of a soft contact lens to control myopia progression

Valle

Blázquez²,

Gros-Otero

et al. 2021

Clinical and Experimental Optometry

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“…However, a large eye rotation will alter muscular stress as well as eyelid pressure on the eyeball, potentially causing optical changes, [251][252][253] although such changes have not been noted in more recent studies. [254][255][256] In the case of contact lenses, it should also be noted that El-Nimri and Walline 257 found that eye movements can cause shifts in soft contact lenses by more than 0.5 mm, and thus have the potential to affect peripheral refraction measurements. It is recommended that (where possible and without slowing measurement time) eye movements should be limited during peripheral refraction testing, especially when measuring at large angles.…”

Section: Exploratory Outcomesmentioning

confidence: 99%

IMI – Clinical Myopia Control Trials and Instrumentation Report

Wolffsohn

Kollbaum

Berntsen

et al. 2019

Invest. Ophthalmol. Vis. Sci.

127

179

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The evidence-basis based on existing myopia control trials along with the supporting academic literature were reviewed; this informed recommendations on the outcomes suggested from clinical trials aimed at slowing myopia progression to show the effectiveness of treatments and the impact on patients. These outcomes were classified as primary (refractive error and/or axial length), secondary (patient reported outcomes and treatment compliance), and exploratory (peripheral refraction, accommodative changes, ocular alignment, pupil size, outdoor activity/ lighting levels, anterior and posterior segment imaging, and tissue biomechanics). The currently available instrumentation, which the literature has shown to best achieve the primary and secondary outcomes, was reviewed and critiqued. Issues relating to study design and patient selection were also identified. These findings and consensus from the International Myopia Institute members led to final recommendations to inform future instrumentation development and to guide clinical trial protocols.

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“…Some studies have investigated contact lens centration on the eye. [21][22][23][24] As an example, El-Nimri and Walline 24 evaluated centration of a soft multifocal contact lens (centre-distance Proclear, CooperVision, www.coopervision. com) for primary gaze and 20°eye rotation.…”

Section: Introductionmentioning

confidence: 99%

Effects of eye rotation and contact lens decentration on horizontal peripheral refraction

Jaisankar

Leube

Gifford

et al. 2019

Ophthalmic Physiologic Optic

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Purpose Peripheral refraction is important in design of myopia control therapies. The aim was to investigate the influence of contact lens decentration associated with eye rotation on peripheral refraction in the horizontal visual field. Methods Participants were 10 emmetropes and 10 myopes in good general and ocular health. Right eyes underwent cycloplegic peripheral refraction, using a Grand‐Seiko WAM‐5500 Autorefractor, in 5° steps to ±35° eccentricities along the horizontal visual field. Targets were fixated using eye rotation only or head rotation only. Refractions were measured without correction and with three types of contact lenses: single vision, a multifocal centre‐distance aspheric with +2.50 D add and NaturalVue aspheric. Photographs of eyes during lens wear were taken for each eye rotation. Effects of visual field angle, lens type and test method (head or eye rotation) on vector components of relative peripheral refraction were evaluated using repeated measures anovas. Test method for each visual field angle/lens combination were compared via paired t‐tests. Results Horizontal decentration ranges across the visual field were 1.2 ± 0.6 mm for single vision and 1.2 ± 0.4 mm for multifocal lenses but smaller at 0.7 ± 0.4 mm for NaturalVue lenses. There were only two significant effects of test method across the visual field angle/lens type combinations (single vision: for emmetropes horizontal/vertical astigmatism component at 35° nasal with mean difference −0.38 D and for myopes spherical equivalent refraction at 20° temporal with mean difference +0.24 D). Conclusion Upon eye rotation the contact lenses decentred on the eye, but not enough to affect peripheral refraction. For the types assessed and for the horizontal visual field out to ±35° when measurements were performed with the Grand‐Seiko WAM‐5500 autorefractor, it is valid to use eye rotations to investigate peripheral refraction.

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Centration and Decentration of Contact Lenses during Peripheral Gaze

Cited by 11 publications

References 26 publications

Efficacy and safety of a soft contact lens to control myopia progression

Efficacy and safety of a soft contact lens to control myopia progression

IMI – Clinical Myopia Control Trials and Instrumentation Report

Effects of eye rotation and contact lens decentration on horizontal peripheral refraction

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