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Auteur Heather Anderson
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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 Comparison of Dynamic Retinoscopy and Autorefraction for Measurement of Accommodative Amplitude / Rami Aboumourad in OVS : Optometry & Vision Science, vol. 96, 09 (Septembre 2019)
[article]
in OVS : Optometry & Vision Science > vol. 96, 09 (Septembre 2019)
Titre : Comparison of Dynamic Retinoscopy and Autorefraction for Measurement of Accommodative Amplitude Type de document : article de périodique Auteurs : Rami Aboumourad ; Heather Anderson Année de publication : 2019 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Accommodation oculaire
[Thésaurus Mesh]Analyse appariée
[Thésaurus Mesh]Collecte de données
[Thésaurus Mesh]Rétinoscopie
[Thésaurus Mesh]Tests de vision
[Thésaurus HELB]:Optique:amplitude d'accommodationRésumé : SIGNIFICANCE: This study promotes the use of dynamic retinoscopy to obtain objective measures of accommodative amplitude (AA) in the clinical setting in lieu of the subjective push-up technique. PURPOSE: This study compared the agreement between open-field autorefraction and a modified dynamic retinoscopy for the objective measurement of AA. METHODS: Accommodative amplitude was measured using two objective techniques for subjects aged 5 to 60 years. Test order was randomized and monocular AA was measured as subjects viewed printed letters 0.9 mm in height with their dominant eye and distance refraction. For retinoscopy, subjects held a near rod and viewed the target at the nearest (most proximal) point of clear vision. The examiner then performed dynamic retinoscopy along the horizontal meridian and identified the physical location of neutrality of the reflex, which was converted to AA in diopters. Autorefraction was performed obtaining repeated measures of refraction beginning from a target demand of 2.5 D and increasing in discrete steps until there was no subsequent increase in accommodative response. Refractions were converted to power in the horizontal meridian and expressed as accommodation in diopters with the maximal value termed the AA. Distance overrefractions were measured for both techniques to adjust AA for any uncorrected refractive error. Difference versus mean analysis was used to compare agreement between tests. RESULTS: The 95% limits of agreement between techniques were calculated after removal of two young outliers who responded poorly to one of the techniques. The overall mean difference for 95 subjects was 0.02 ± 0.97 D, with limits of agreement spanning −1.87 to 1.92 D. No significant linear relationship between the magnitude of the AA and the differences between techniques was observed. CONCLUSIONS: Agreement between dynamic retinoscopy and open-field autorefraction was less than 2 D with no systematic bias, suggesting that dynamic retinoscopy may be a suitable clinical technique to measure objective AA. Note de contenu :
Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Comparison of proximal and minus lens autorefraction techniques to measure monocular accommodative amplitude / Sidney M. Parks in OVS : Optometry & Vision Science, vol. 101, 02 (Fevrier 2024)
[article]
in OVS : Optometry & Vision Science > vol. 101, 02 (Fevrier 2024)
Titre : Comparison of proximal and minus lens autorefraction techniques to measure monocular accommodative amplitude Type de document : article de périodique Auteurs : Sidney M. Parks ; Heather Anderson Année de publication : 2024 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Accommodation oculaire
[Thésaurus Mesh]Collecte de données
[Thésaurus HELB]:Optique:amplitude d'accommodationMots-clés : amplitude accommodative monoculaire autoréfracteur Résumé : SIGNIFICANCE
This study provides a faster method for objectively measuring accommodative amplitude with an open-field autorefractor in a research setting.
PURPOSE
Objective measures of accommodative amplitude with an autorefractor take time because of the numerous stimulus demands tested. This study compares protocols using different amounts and types of demands to shorten the process.
METHODS
One hundred participants were recruited for four age bins (5 to 9, 10 to 14, 15 to 19, and 20 to 24 years) and monocular amplitude measured with an autorefractor using three protocols: proximal, proximal-lens (letter), and proximal-lens (picture). For proximal, measurements were taken as participants viewed a 0.9 mm “E” placed at 13 demands (40 to 3.3 cm = 2.5 to 30 D). The other protocols used a target (either the “E” or a detailed picture) placed at 33 and 12.5 cm followed by 12.5 cm with a series of lenses (−2, −4, and −5.5 D). Adjustments were made for lens effectivity for the three lens conditions, which were thus 9.6, 11.1, and 12.0 D for individuals without additional spectacle lenses. Accommodative amplitude was defined as the greatest response measured with each technique. One-way analysis of variance was used to compare group mean amplitudes across protocols and differences between letter protocols by age bin.
RESULTS
Amplitudes were significantly different between protocols (p < 0.001), with proximal having higher amplitudes (mean ± standard deviation, 8.04 ± 1.70 D) compared with both proximal-lens protocols (letter, 7.48 ± 1.42 D; picture, 7.43 ± 1.42 D) by post hoc Tukey analysis. Differences in amplitude between the proximal and proximal-lens (letter) protocol were different by age group (p = 0 .003), with the youngest group having larger differences (1.14 ± 1.58 D) than the oldest groups (0.17 ± 0.58 and 0.29 ± 0.48 D, respectively) by post hoc Tukey analysis.
CONCLUSIONS
The proximal-lens protocols took less time and identified the maximum accommodative amplitude in participants aged 15 to 24 years; however, they may underestimate true amplitude in younger children.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 Visual 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)
[article]
in OVS : Optometry & Vision Science > vol. 99, 01 (Janvier 2022)
Titre : Visual Acuity Outcomes in a Randomized Trial of Wavefront Metric-optimized Refractions in Adults with Down Syndrome Type de document : article de périodique Auteurs : Heather Anderson ; Jason Marsack ; Julia Benoit ; Ruth E. Manny ; Karen D. Fern Année de publication : 2022 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]:T:Troubles de la vision:Troubles de la vision / thérapie
[Thésaurus Mesh]Acuité visuelle
[Thésaurus Mesh]Essais cliniques comme sujet
[Thésaurus Mesh]Optométrie
[Thésaurus Mesh]Réfraction oculaire
[Thésaurus Mesh]Syndrome de Down
[Thésaurus Mesh]Tests de visionRésumé : SIGNIFICANCE
This study reports visual acuity outcomes from a clinical trial investigating an objective refraction strategy that may provide a useful tool for practitioners needing additional strategies to identify refractive corrections for adults with intellectual disability.
PURPOSE
Determining refractions for individuals with Down syndrome is challenging because of the presence of elevated refractive error, optical aberrations, and cognitive impairment. This randomized clinical trial evaluated the performance of spectacle corrections determined using clinical techniques and objective refractions derived from wavefront aberration measures.
METHODS
Thirty adults with Down syndrome had a clinical refraction determined by a single expert examiner using pre-dilation and post-dilation techniques appropriate for this population. Objective refractions were determined from dilated wavefront aberration measures that were processed post-visit to identify refractions that optimized each of two image quality metrics: pupil fraction tessellated and visual Strehl ratio in the spatial domain. The three refractions were dispensed in random order and worn for 2 months each. The primary outcome measure, binocular visual acuity, was obtained by a masked examiner administering a distance logMAR acuity test. To compare treatment types, mean acuity was compared using a two-sided type 3 F test of the treatment effect in a linear mixed-effects regression model, where the final model included fixed effects for treatment, period (1, 2, or 3), and first-order carryover effects.
RESULTS
The 2-month estimated least square means in binocular visual acuity (logMAR) were 0.34 (95% confidence interval [CI], 0.25 to 0.39) for clinical refractions, 0.31 (95% CI, 0.25 to 0.36) for pupil fraction tesselated refractions, and 0.33 (95% CI, 0.27 to 0.38) for visual Strehl ratio refractions. No statistically significant treatment effect was observed (F = 1.10, P = .34).
CONCLUSIONS
Objective refractions derived from dilated wavefront aberration measures resulted in acuity similar to expert clinician-derived refractions, suggesting that the objective method may be a suitable alternative for patients with Down syndrome.Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire