Peripheral refraction with different designs of progressive soft contact lenses in myopes

Allinjawi, Kareem; Sharanjeet-Kaur, Sharanjeet-Kaur; Akhir, Saadah Mohamed; Mutalib, Haliza Abdul

doi:10.12688/f1000research.9971.1

Cited by 4 publications

(4 citation statements)

References 18 publications

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“…The treatment zone ( 48 , 49 ) and high-order aberrations ( 50 ) also have important roles in slowing axial elongation. In 2016, Allinjawi et al compared the peripheral retinal hyperopic defocus reductions with two different progressive multifocal contact lens designs and reported that lenses with additional power commencing at 3.5 mm diameter induced significant reduction in the peripheral retinal hyperopic defocus compared with lenses with additional power commencing at 5.0 mm diameter ( 51 ). A recent study demonstrated that a smaller back optic zone diameter for the orthokeratology lens generated a smaller plus power ring diameter on the anterior corneal surface.…”

Section: Discussionmentioning

confidence: 99%

High myopia control is comparable between multifocal rigid gas-permeable lenses and spectacles

Yu,

Zhuo,

Song

et al. 2023

Front. Med.

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PurposeOcular pathology may be reduced by slowing myopia progression. The purpose of this study was to evaluate the potential of a novel custom-designed rigid gas permeable (RGP) contact lens to control high myopia by comparing the efficacy of multifocal RGP lenses and single-vision spectacles for high myopia control.MethodsThe medical records of children fitted with spectacles or multifocal rigid gas-permeable lenses between January 2018 and May 2020 were retrospectively reviewed. Children (5–17 years) with non-cycloplegic spherical equivalent refraction of ≤ −6.00 D or spherical equivalent refraction > − 6.00 D with baseline axial length ≥ 26.5 mm, and astigmatism of ≥ −2.00 D were included. Axial length and refraction were measured at baseline, before fitting the participants with multifocal rigid gas-permeable lenses or spectacles, and at 1- and 2-year follow-up visits. Changes in axial length were compared between the groups.ResultsAmong the 77 children with 1-year follow-up data, the mean axial elongation was 0.20 ± 0.17 mm and 0.21 ± 0.14 mm in the multifocal rigid gas-permeable and control groups, respectively, without significant differences between groups (F = 0.004, p = 0.835). Among the 41 patients who completed 2 years of follow-up, the mean axial elongation values in the multifocal rigid gas-permeable and control groups were 0.21 ± 0.15 mm and 0.24 ± 0.13 mm, respectively, at the 1-year follow-up, and 0.37 ± 0.27 mm and 0.43 ± 0.23 mm, respectively, at the 2-year follow-up, without significant between-group differences at either time point (p = 0.224).ConclusionAxial length increased at a similar rate in both the control (spectacles) and multifocal rigid gas-permeable lens groups, suggesting that multifocal rigid gas-permeable lenses have no significant impact on controlling high myopia progression compared with spectacles.

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Section: Discussionmentioning

confidence: 99%

High myopia control is comparable between multifocal rigid gas-permeable lenses and spectacles

Yu,

Zhuo,

Song

et al. 2023

Front. Med.

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“…One study compared the reduction of the peripheral retinal hyperopic defocus in two different designs of progressive MFCLs. Only the lens with the additional power starting at the 3.5-mm diameter caused a significant reduction in the peripheral retinal hyperopic defocus, while the lens with the additional power starting at the 5.0-mm diameter did not ( Allinjawi et al, 2016 ). Li et al also reported that MFCLs with two concentric defocus rings in the periphery had better myopia control than MFCLs with a single peripheral defocus ring ( Li et al, 2017 ).…”

Section: Discussionmentioning

confidence: 99%

“…During the day, this altered corneal front surface induces myopic defocus on the peripheral retina ( Charman et al, 2006 ; Queiros et al, 2010 , 2018 ), and this may be a mechanism for myopia retardation ( Smith et al, 2009 ; Benavente-Perez et al, 2014 ). In contrast, daytime MFCL wear directly imposes peripheral retinal myopic defocus when the lenses are worn ( Sankaridurg et al, 2011 ; Allinjawi et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

The Spatial Distribution of Relative Corneal Refractive Power Shift and Axial Growth in Myopic Children: Orthokeratology Versus Multifocal Contact Lens

et al. 2021

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PurposeTo determine if the spatial distribution of the relative corneal refractive power shift (RCRPS) explains the retardation of axial length (AL) elongation after treatment by either orthokeratology (OK) or multifocal soft contact lenses (MFCLs).MethodsChildren (8–14 years) were enrolled in the OK (n = 35) or MFCL (n = 36) groups. RCRPS maps were derived by computing the difference between baseline and 12-month corneal topography maps and then subtracting the apex values. Values at the same radius were averaged to obtain the RCRPS profile, from which four parameters were extracted: (1) Half_x and (2) Half_y, i.e., the x- and y-coordinates where each profile first reached the half peak; (3) Sum4 and (4) Sum7, i.e., the summation of powers within a corneal area of 4- and 7-mm diameters. Correlations between AL elongation and these parameters were analyzed by multiple linear regression.ResultsAL elongation in the OK group was significantly smaller than that in the MFCL group (p = 0.040). Half_x and Half_y were also smaller in the OK group than the MFCL group (p < 0.001 each). Half_x was correlated with AL elongation in the OK group (p = 0.005), but not in the MFCL group (p = 0.600). In an analysis that combined eyes of both groups, Half_x was correlated with AL elongation (β = 0.161, p < 0.001).ConclusionsThe OK-induced AL elongation and associated RCRPS Half_x were smaller than for the MFCL. Contact lenses that induce RCRPS closer to the corneal center may exert better myopia control.

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“…Thus, several optical means have attempted to reduce the magnitude of hyperopic peripheral defocus or peripherally impose myopic defocus while maintaining good correction of foveal refractive errors. Orthokeratology, multifocal soft contact lenses, custom-designed rigid gas permeable lenses, and some novel contact lens designs can effectively regulate peripheral refraction in myopic eyes [9][10][11]. If the hypothesis is correct, it is important to quantify the effect of these lenses on imposing peripheral myopic defocus.…”

Section: Introductionmentioning

confidence: 99%

Effects of novel multifocal soft contact lens on peripheral refraction of myopic eyes when looking at distant and near targets

Liu

Mao

Wen

et al. 2020

Preprint

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Background It is generally accepted the association between hyperopic peripheral defocus and myopia progression. To search for a good optical method to slow the myopia progression for the children who need long-time near work, we compared the effects of novel multifocal soft contact lenses (MFSCLs) with single vision soft contact lenses (SVSCLs) on peripheral refraction when looking at both distant and near targets. Methods The refraction of 25 young myopic subjects’ right eye were measured at horizontal retina eccentricities in 10º steps from 30º temporal to 30º nasal, with no correction (baseline), novel MFSCLs and SVSCLs when looking at distant (5 m) and near (0.4 m) targets. Results Subjects wearing MFSCLs presented significantly more myopic relative peripheral refractive error (RPRE) profile than SVSCLs at all horizontal retina eccentricities when looking at distant targets (all p<0.01). Compared with looking at distant targets, subjects wearing SVSCLs or MFSCLs showed a hyperopic shift of peripheral defocus when looking at near targets, owning to the effects of accommodative lag and hyperopic RPRE change during accommodation (except T20º and T30º wearing SVSCLs and N30º wearing MFSCLs, p=0.822, p=0.950, p=0.390, respectively, all other eccentricities p<0.05). But subjects wearing MFSCLs could still maintain a certain magnitude of myopic peripheral defocus at horizontal retina eccentricities when looking at near targets (T20° and T30°, p=0.023 and p<0.001, respectively). Conclusions The novel MFSCLs imposed strong myopic peripheral defocus when looking at distant targets. They also maintain a certain magnitude of myopic peripheral defocus when looking at near targets, regardless of the hyperopic effect of accommodation lag and hyperopic shift in RPRE during accommodation.

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Peripheral refraction with different designs of progressive soft contact lenses in myopes

Cited by 4 publications

References 18 publications

High myopia control is comparable between multifocal rigid gas-permeable lenses and spectacles

High myopia control is comparable between multifocal rigid gas-permeable lenses and spectacles

The Spatial Distribution of Relative Corneal Refractive Power Shift and Axial Growth in Myopic Children: Orthokeratology Versus Multifocal Contact Lens

Effects of novel multifocal soft contact lens on peripheral refraction of myopic eyes when looking at distant and near targets

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