Optical and imaging properties of a novel multi‐segment spectacle lens designed to slow myopia progression

Jaskulski, Matt; Singh, Neeraj; Bradley, Arthur; Kollbaum, Pete

doi:10.1111/opo.12725

Cited by 29 publications

(62 citation statements)

References 32 publications

(40 reference statements)

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“…The results of VA tested using FrACT in the current study were consistent with the findings of CS. Jaskulski et al also found that the DIMS decreased contrast sensitivity at high spatial frequencies ( Jaskulski et al, 2020 ). For VA in high luminance and high contrast, HC induced the most vision loss by approximately 0.09 logMAR, followed by HAL and SAL.…”

Section: Discussionmentioning

confidence: 97%

“…Other than the configuration of lenslets, which resulted in less fragmented optics due to small aperture, the diameter of lenslets was also a factor impacting optical performance. HAL and SAL had a slightly larger lenslet diameter than HC (1.03 vs. 1.12 mm), which reduced diffraction caused by fragmented optics due to smaller aperture ( Jaskulski et al, 2020 ).…”

Section: Discussionmentioning

confidence: 99%

“…In summary, to calculate MTF, one evaluates the complex amplitude in the pupil plane, then using fast Fourier transform (FFT) calculates the point spread function (PSF) and finally the MTF, using one center wavelength (λ = 550 nm) and assuming the pupil position directly on the glass ( Voelz, 2011 ). The MTFa of optical simulation of three lens designs with lenslets was calculated within the spatial frequency range of 0–15 cycles per degree (cpd) ( Vega et al, 2018 ; Jaskulski et al, 2020 ) on 4, 6, and 8 mm apertures by a 550-nm light source. MTFs were computed for the same pupil apertures at 5, 10, and 15 cpd.…”

Section: Methodsmentioning

confidence: 99%

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Influence of Lenslet Configuration on Short-Term Visual Performance in Myopia Control Spectacle Lenses

Xue

Ding

et al. 2021

Front. Neurosci.

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Purpose: This study aimed to evaluate short-term visual performance and optical quality of three different lenslet configurations on myopia control spectacle lenses.Materials and Methods: This study utilized a cross-over design. Distance visual acuity (VA) was measured in 50 myopic children; contrast sensitivity (CS) was measured in 36 myopic children. For each test, four spectacle lenses were evaluated in a random order: single-vision lens (SVL), lens with concentric rings of highly aspherical lenslets (HAL), lens with concentric rings of slightly aspherical lenslets (SAL), and lens with honeycomb configuration of spherical lenslets (HC). The modulation transfer function (MTF) and MTF area (MTFa) were used to determine optical quality. All tests were performed monocularly on the right eye with full correction.Results: HAL and SAL had larger MTFa than HC. VA in lenses with lenslets was significantly reduced compared to SVL (all p < 0.01). The reduction in VA was worse with HC than with SAL (p = 0.02) and HAL (p = 0.03); no effect of lenslet asphericity was found (p > 0.05). VA changes induced by lenslets showed no correlation with spherical equivalent refraction (all p > 0.05) and were weakly positively associated with age for SAL (r = 0.36, p = 0.01) and HC (r = 0.31, p = 0.03), but not for HAL (p = 0.30). The area under the log contrast sensitivity function (AULCSF) decreased with HAL and HC (all p < 0.001) in all illumination levels, and AULCSF with HAL was higher than that with HC in a photopic condition (1.17 ± 0.10 vs. 1.10 ± 0.13, p = 0.0004). The presence of lenslets did not affect CS at 3 cycles per degree (cpd) (p = 0.80). At 6 to 18 cpd, CS was significantly reduced by HAL and HC (all p < 0.05), but not SAL (p > 0.05) compared to SVL. At high spatial frequencies (>12 cpd) both SAL and HAL reduced CS significantly less than HC (all p < 0.01).Conclusion: Short-term visual performance was minimally impaired by looking through the lenslet structure of myopia control spectacle lenses. Concentric rings with aspherical lenslets had a significantly lower impact on both VA and CS than honeycomb configuration with spherical lenslets.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Lenslet Configuration on Short-Term Visual Performance in Myopia Control Spectacle Lenses

Xue

Ding

et al. 2021

Front. Neurosci.

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“…This result is consistent with that of another separate study in which better high contrast visual acuity in children was also found for HAL and SAL than the DIMS lens 38 . Another recent investigation combined high sampling density optical metrology with pupil‐ and image‐plane numerical analyses to evaluate the same lens 40 . Both visual inspection and wavefront metrology revealed that the lenslets gave a coverage factor of approximately 40%.…”

Section: Discussionmentioning

confidence: 99%

The impact of spectacle lenses for myopia control on visual functions

Gao¹,

Lim²,

Yang³

et al. 2021

Ophthalmic Physiologic Optic

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Purpose Spectacle lenses containing multiple small peripheral elements have been developed for myopia control in children. It is important that their effect on vision be quantified by (i) fixation through the peripheral portion, thereby using foveal vision and (ii) by fixation through the central portion and presentation of peripheral targets. Methods The above approaches were used in five studies to evaluate two novel spectacle lens designs: spectacle lenses with Highly Aspherical Lenslets (HAL) and Slightly Aspherical Lenslets (SAL). A single vision lens served as a control. Visually normal adults participated in each study. The first two studies had subjects fixate through the periphery of the lenses. High and low (10%) contrast visual acuity was measured with the Freiburg Vision Test and reading speed for high and low contrast words measured with a sentence generator. The other three studies assessed peripheral vision while subjects fixated through the central portion of the lens. Peripheral contrast sensitivity was measured using two cycles per degree drifting Gabor stimuli. Peripheral motion perception was further evaluated using random dot stimuli. Finally, attention was measured using an established test of useful field of view with three levels of complexity. Results The periphery of the HAL lens significantly reduced low contrast visual acuity, but not high contrast visual acuity, while the effect of the SAL lens was not significant for either. Neither test lens affected reading speed for high contrast words, but the HAL lens significantly affected performance for low contrast words. Neither test lens affected peripheral motion perception or useful field of view. Conclusions Low contrast visual acuity and reading was slightly reduced while high contrast visual acuity was unaffected when fixating through the periphery of the novel lens designs. None of the peripheral measures of vision was affected by the novel lens designs.

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“…In addition, emmetropization might not only be caused by increased photoreceptor sensitivity but also due to focusing short-wavelength light in front of the retina based on longitudinal chromatic aberration and induced monochromatic myopic defocus [36]. A myopic defocus appears protective against myopia progression in human and animal studies [21,34,37,47,[72][73][74][75]. The complexity around short-wavelength retinal light stimulation or stimulation with other wavelengths and myopia is high.…”

Section: Influence Of Different Wavelength Ranges In Context Of Myopia Controlmentioning

confidence: 99%

Effects of screen-based retinal light stimulation measured with a novel contrast sensitivity test

2021

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Myopia is increasing worldwide hence it exists a pressing demand to find effective myopia control strategies. Previous studies have shown that light, spectral composition, spatial frequencies, and contrasts play a critical role in refractive development. The effects of light on multiple retinal processes include growth regulation, but also visual performance and perception. Changes in subjective visual performance can be examined by contrast sensitivity (CS). This study was conducted to investigate whether retinal light stimulation of different wavelength ranges is able to elicit changes in CS and, therefore, may be used for myopia control purposes. In total, 30 right eyes were stimulated with the light of different wavelength ranges, including dominant wavelengths of ∼480 nm, ∼530 nm, ∼630 nm and polychromatic light via a commercial liquid crystal display (LCD) screen. Stimulation was performed screen full-field and on the optic nerve head only. CS was measured before any stimulation and after each stimulation condition using a novel and time-efficient CS test. Post-stimulation CS changes were analyzed by ANOVA regarding the influencing factors spatial frequency, stimulation wavelength and stimulation location. A priorly conducted verification study on a subset of five participants compared the newly developed CS test to a validated CS test. The novel CS test exhibited good reliability of 0.94 logCS and repeatability of 0.13 logCS with a duration of 92 sec ± 17 sec. No clinically critical change between pre- and post-stimulation CS was detected (all p>0.05). However, the results showed that post-stimulation CS differed significantly at 18 cpd after stimulation with polychromatic light from short-wavelength light (p<0.0001). Location of illumination (screen full-field vs. optic nerve head) or any interactions with other factors did not reveal significant influences (all p>0.05). To summarize, a novel CS test measures the relationship between retinal light stimulation and CS. However, using retinal illumination via LCD screens to increase CS is inconclusive.

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Optical and imaging properties of a novel multi‐segment spectacle lens designed to slow myopia progression

Cited by 29 publications

References 32 publications

Influence of Lenslet Configuration on Short-Term Visual Performance in Myopia Control Spectacle Lenses

Influence of Lenslet Configuration on Short-Term Visual Performance in Myopia Control Spectacle Lenses

The impact of spectacle lenses for myopia control on visual functions

Effects of screen-based retinal light stimulation measured with a novel contrast sensitivity test

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