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Auteur Jason Marsack
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Ajouter le résultat dans votre panier Affiner la rechercheApplication of Topographical Keratoconus Detection Metrics to Eyes of Individuals with Down Syndrome / Jason Marsack in OVS : Optometry & Vision Science, vol. 96, 09 (Septembre 2019)
[article]
in OVS : Optometry & Vision Science > vol. 96, 09 (Septembre 2019)
Titre : Application of Topographical Keratoconus Detection Metrics to Eyes of Individuals with Down Syndrome Type de document : article de périodique Auteurs : Jason Marsack ; Julia Benoit ; Pete Kollbaum ; Heather Anderson Année de publication : 2019 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Collecte de données
[Thésaurus Mesh]Diagnostic par imagerie
[Thésaurus Mesh]Kératocône
[Thésaurus Mesh]Prévalence
[Thésaurus Mesh]Syndrome de DownRésumé : SIGNIFICANCE: The challenges associated with clinical assessment of individuals with Down syndrome contribute to a wide range of estimates on the prevalence of keratoconus in the Down syndrome population. This work focuses on two topographical indices previously identified with keratoconus detection, applying them to a topographical data set meeting strict sampling criteria. PURPOSE: The purpose of this study was to quantify the level of keratoconus-like topographical morphology in a large sample of eyes from individuals with Down syndrome, as identified by two keratoconus detection metrics: inferior-superior dioptric asymmetry (I-S) and KISA%. Severity of the asymmetry was also cast within the context of established Collaborative Longitudinal Evaluation of Keratoconus study disease severity classification criteria. METHODS: Corneal topography data on both eyes of 140 subjects with Down syndrome and 138 control subjects were collected. Both I-S and KISA% were calculated from the topography data of eyes with sufficient sampling. Steep and flat keratometry data are reported for subjects with measurements on both eyes in the context of values recorded by the Collaborative Longitudinal Evaluation of Keratoconus study in frank keratoconus to examine within-eye and between-eye asymmetry and severity. RESULTS: Keratoconus detection thresholds were exceeded in 20.8% of the eyes of subjects with Down syndrome and 2.2% of the eyes of controls using I-S and 11.8% of the eyes of subjects with Down syndrome and 0.0% of the eyes of controls using KISA%. Examination of the level of intraeye difference between flat and steep keratometry data for individuals with Down syndrome detected as having corneal morphology consistent with moderate keratoconus yields an average of 1.81 D of toricity, whereas the Collaborative Longitudinal Evaluation of Keratoconus study reported 3.28 D of toricity. CONCLUSIONS: Morphology consistent with keratoconus as codified in the detection metrics I-S and KISA% is present in a large percentage of the eyes of individuals with Down syndrome. Differences were observed in the distribution of severity of corneal morphology in individuals with Down syndrome and the keratoconus population at large. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Case Report: What Are We Doing for Our “20/20 Unhappy” Scleral Lens Patients? / Lan Chi Nguyen in OVS : Optometry & Vision Science, vol. 97, 09 (Septembre 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 09 (Septembre 2020)
Titre : Case Report: What Are We Doing for Our “20/20 Unhappy” Scleral Lens Patients? Type de document : article de périodique Auteurs : Lan Chi Nguyen ; Matthew J. Kauffman ; Gareth D. Hastings ; Raymond A Applegate ; Jason Marsack Année de publication : 2020 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Acuité visuelle
[Thésaurus HELB]:Optique:lentilles sclérales
[Thésaurus HELB]:Paramédical:correction de la déficience visuelle
[Thésaurus HELB]:Paramédical:Satisfaction des patientsRésumé : SIGNIFICANCE: Scleral lenses (SLs) partially mask higher-order aberrations (HOAs) in highly aberrated eyes. Although visual acuity (VA) may show satisfactory quantitative clinical outcomes during SL wear, residual (uncorrected) HOAs can leave subjective visual quality goals unmet. PURPOSE: The purpose of this study was to report a case where a “20/20 unhappy” patient with SLs was able to meet visual goals with wavefront-guided SLs. CASE REPORT: A 40-year-old male with bilateral keratoconus, whose Snellen VA with SLs was 20/20+2 right eye (OD) 20/16+2 left eye (OS), reported halos and glare at night and perceptual smearing. When viewing a point of light, a “Ferris wheel” shadowing was observed OD and a U-shaped shadowing OS. Residual higher-order root mean square wavefront error was 0.49 μm OD and 0.39 μm OS; visual image quality measured by visual Strehl ratio was 0.067 OD and 0.092 OS (pupil size, 4.00 mm). Wavefront-guided SLs reduced residual higher-order root mean square to 0.19 μm OD and 0.25 μm OS, VA improved to 20/10 OD and 20/13 OS, and visual Strehl improved to 0.150 OD and 0.121 OS. The patient reported reduced smearing, shadowing, and night vision concerns, meeting his visual expectations and goals. CONCLUSIONS: Wavefront sensing quantifies both lower and HOAs, which can cause visual dissatisfaction in individuals with highly aberrated eyes, despite sometimes reaching typical levels of VA. As wavefront-guided SLs targeting these residual aberrations to improve visual image quality become more available, they should be considered for 20/20 unhappy patients when conventional clinical options are unsatisfactory. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Case Report: When Two Is Worse Than One—Stereo Imbalance in a Case of Wavefront-guided Scleral Lenses / Lan Chi Nguyen in OVS : Optometry & Vision Science, vol. 100, 05 (Mai 2023)
[article]
in OVS : Optometry & Vision Science > vol. 100, 05 (Mai 2023)
Titre : Case Report: When Two Is Worse Than One—Stereo Imbalance in a Case of Wavefront-guided Scleral Lenses Type de document : article de périodique Auteurs : Lan Chi Nguyen ; Wei Hau Lew ; Matthew J. Kauffman ; Jason Marsack ; Raymond A Applegate ; Daniel R. Coates Année de publication : 2023 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Acuité visuelle
[Thésaurus Mesh]Vision binoculaire
[Thésaurus Mesh]Vision monoculaire
[Thésaurus HELB]:Optique:lentilles scléralesMots-clés : contraste rétinien équilibre binoculaire stéréoacuité lentilles sclérales guidées par le front d'onde Résumé : SIGNIFICANCE: Wavefront-guided scleral lenses (WGSLs) reduce visually debilitating residual higher-order aberrations. Although reduced higher-order aberrations lead to improvement in monocular high-contrast visual acuity (VA), the success of the lenses in everyday life depends on additional factors such as retinal contrast, binocular balance, and stereoacuity. PURPOSE: This report describes a case where WGSLs provided improved monocular vision compared with scleral lenses (SLs) but reduced binocularity and stereoacuity. CASE REPORT: A 48-year-old woman with moderate keratoconus right eye (OD) and severe left eye (OS) was fitted with SLs and WGSLs. Visual acuity with best SLs was 20/20−2 OD and 20/25−2 OS. Residual higher-order rootmean-square (HORMS) wavefront error (6 mm pupil) was 0.56 μm OD and 1.38 μm OS. Visual acuity with WGSLs was 20/16−2 OD and 20/25+2 OS, and residual HORMS was 0.41 μm OD and 0.98 μm OS. Monocularly, WGSLs were reported to provide better VA. However, binocularly, the patient reported an “imbalanced feeling” and preferred the SLs over WGSLs. Binocular VA at distance was 20/25 with SLs and 20/25−2 with WGSL. To investigate, the Worth Four-Dot test was performed, and the outcomes reported fusion with SLs but suppression OS at distance with WGSLs. Stereoacuity was 160 arc seconds at near and 120 arc seconds at distance with SLs and 400 arc seconds at near and >1200 arc seconds at distance with WGSLs. Dichoptic contrast balancing showed a balance point of 0.48 with SLs and 0.17 with WGSLs, indicating a strong preference toward OD. Simulation of the patient's retinal image revealed a greater difference in image contrast between the two eyes with WGSLs. CONCLUSIONS: Wavefront-guided scleral lenses reduced HORMS and improved VA compared with SLs. However, in this case, it inadvertently caused binocular imbalance. As WGSLs become more widely available, future work should include methods to optimize binocular balance to maximize overall patient satisfaction. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Do Polymer Coatings Change the Aberrations of Conventional and Wavefront-guided Scleral Lenses? / Gareth D. Hastings in OVS : Optometry & Vision Science, vol. 97, 01 (Janvier 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 01 (Janvier 2020)
Titre : Do Polymer Coatings Change the Aberrations of Conventional and Wavefront-guided Scleral Lenses? Type de document : article de périodique Auteurs : Gareth D. Hastings ; Julianna Z. Zanayed ; Lan Chi Nguyen ; Raymond A Applegate ; Jason Marsack Année de publication : 2020 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]:S:Syndromes de l'oeil sec:Syndromes de l'oeil sec / prévention et contrôle
[Thésaurus Mesh]Collecte de données
[Thésaurus HELB]:Optique:lentilles sclérales
[Thésaurus HELB]:Optique:revêtement polymèreRésumé : SIGNIFICANCE: The findings of this study indicate that patients could simultaneously be offered the individualized optical correction of wavefront-guided (WFG) lenses and the superior comfort afforded by polymer coatings. This could be helpful to patients with ectasia suffering ocular dryness or dependent on scleral lenses for lengthy periods of wear. PURPOSE: Wavefront-guided scleral lenses target lower- and higher-order aberrations of individual eyes using submicrometer-level contours in the anterior lens surface. Hydrophilic polyethylene glycol (PEG) polymer coatings applied to lens surfaces improve comfort and wettability. This study aimed to quantify aberration changes (e.g., masking) when applying polymer coatings to WFG and conventional scleral lenses. METHODS: Two control lenses (remained uncoated) and 14 experimental lenses (two repeated builds of seven aberration designs: one spherical, two coma, four full WFG [second- to fifth-order aberrations]) were manufactured, and aberrations were measured (mean of three) by two operators before and after coating. Root mean square (RMS) and visual image quality (logVSX) differences were calculated for 6-mm diameters. RESULTS: Median RMS aberration change due to coating was 0.012 μm (range, 0.008 to 0.057 μm). Maximum logVSX change due to coating was 0.073, predicting an approximately one letter change in acuity. Instrument sensitivity was 0.002 μm. Acute instrument and operator variabilities (standard deviations of individual [second- to fifthorder Zernikes] were all Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire A Randomized Trial of Objective Spectacle Prescriptions for Adults with Down Syndrome: Baseline Data and Methods / Heather Anderson in OVS : Optometry & Vision Science, vol. 98, 01 (Janvier 2021)
[article]
in OVS : Optometry & Vision Science > vol. 98, 01 (Janvier 2021)
Titre : A Randomized Trial of Objective Spectacle Prescriptions for Adults with Down Syndrome: Baseline Data and Methods Type de document : article de périodique Auteurs : Heather Anderson ; Julia Benoit ; Jason Marsack ; Ruth E. Manny ; Ayeswarya Ravikumar ; Karen D. Fern ; Kelsey R. Trast Année de publication : 2021 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Calculs
[Thésaurus Mesh]Dépistage visuel
[Thésaurus Mesh]Lunettes correctrices
[Thésaurus Mesh]Syndrome de Down
[Thésaurus Mesh]Troubles de la réfraction oculaire
[Thésaurus Mesh]Troubles de la visionRésumé : SIGNIFICANCE: It is difficult to determine the most efficacious refractive correction for individuals with Down syndrome using routine clinical techniques. New objective methods that optimize spectacle corrections for this population may reduce limitations on daily living by improving visual quality. PURPOSE: This article describes the methods and baseline characteristics of study participants in a National Eye Institute–sponsored clinical trial to evaluate objectively derived spectacle corrections in adults with Down syndrome. Intersession repeatability of the primary outcome measure (distance visual acuity) is also reported. METHODS: Adults with Down syndrome were enrolled into a nine-visit study to compare clinically derived spectacle corrections and two different objective spectacle corrections derived from wavefront aberration data. Spectacle corrections were randomized and dispensed for 2 months each. Distance visual acuity was measured with a BaileyLovie–style chart. Intersession repeatability of acuity was established by performing difference versus mean analysis from binocular acuity measures obtained through habitual corrections at visits 1 and 2. RESULTS: Thirty adults (mean ± standard deviation age, 29 ± 10 years) with a large range of refractive errors were enrolled. Presenting visual acuity at visit 1 was reduced (right eye, 0.47 ± 0.20 logMAR; left eye, 0.42 ± 0.17 logMAR). The mean difference between visits 1 and 2 was 0.02 ± 0.06 logMAR, with a coefficient of repeatability (1.96 within-subject standard deviation) of 0.12 logMAR. CONCLUSIONS: This study seeks to investigate new strategies to determine optical corrections that may reduce commonly observed visual deficits in individuals with Down syndrome. The good intersession repeatability of acuity found in this study (six letters) indicates that, despite the presenc Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire The Impact of Misaligned Wavefront-guided Correction in a Scleral Lens for the Highly Aberrated Eye / Sujata Rijal in OVS : Optometry & Vision Science, vol. 97, 09 (Septembre 2020)
PermalinkVisual Acuity Outcomes in a Randomized Trial of Wavefront Metric-optimized Refractions in Adults with Down Syndrome / Heather Anderson in OVS : Optometry & Vision Science, vol. 99, 01 (Janvier 2022)
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