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Auteur Shirin E. Hassan
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Ajouter le résultat dans votre panier Affiner la rechercheChanges in the properties of the preferred retinal locus with eccentric viewing training / Shirin E. Hassan in OVS : Optometry & Vision Science, vol. 96, 02 (Février 2019)
[article]
in OVS : Optometry & Vision Science > vol. 96, 02 (Février 2019) . - p.79-89
Titre : Changes in the properties of the preferred retinal locus with eccentric viewing training Type de document : article de périodique Auteurs : Shirin E. Hassan, Auteur ; Nicole Christie Ross, Auteur ; Robert Massof, Auteur Année de publication : 2019 Article en page(s) : p.79-89 Langues : Anglais (eng) Langues originales : Anglais (eng) Descripteurs (mots clés) : [Thésaurus Mesh]:T:Troubles de la vision:Troubles de la vision / rééducation et réadaptation
[Thésaurus Mesh]Essai contrôlé randomisé
[Thésaurus Mesh]Scotome
[Thésaurus Mesh]Vision faibleMots-clés : maladie maculaire bilatérale scotomes centraux bilatéraux zones rétiniennes locus rétinien locus rétinien préféré Eccentric Viewing Résumé : SIGNIFICANCE This study explores whether eccentric viewing training (EVT) changes the properties of the retinal area used for fixation in subjects with bilateral macular disease. The data presented demonstrate the feasibility of conducting a randomized controlled trial on EVT.
PURPOSE Patients with bilateral central scotomas adopt other retinal area(s) called preferred retinal locus to substitute the blind fovea. EVT is offered with the goal to improve functional vision by learning how to identify and use a more useful retinal area for fixation—a trained retinal locus—and/or to improve fixation stability with their existing preferred retinal locus. An observational study was conducted to determine whether patients change and adopt a new trained retinal locus location and/or if fixation stability improves after EVT.
METHODS Seventy-six patients with bilateral central scotomas received EVT from an experienced rehabilitation therapist. Retinal locations for repeated fixations and sizes of central scotomas of the better eye were recorded before and after EVT with a scanning laser ophthalmoscope. The position and area of the 95% confidence bivariate ellipse that defines the retinal area in which 95% of fixations occur were analyzed.
RESULTS We observed no significant difference between the size of the area of the fitted ellipses before (mean [SD], 26.4° [19.7°]) and after (mean [SD], 24.8° [20.9°]) EVT (P = .54). However, we observed a shift in the preferred retinal locus location after EVT (P < .0001). The mean (SD) shift in the position of the center of fixation after EVT was 7.5° (5.2°; range, 0.45 to 23°). This mean difference was larger than would be expected from average within-subject fixation stability.
CONCLUSIONS The location of the retinal area used for fixation changes after EVT. Fixation stability does not change after EVT. These preliminary data are yet to be confirmed with the use of a control group.
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Cote Support Localisation Section Disponibilité aucun exemplaire The Effect of Simulated Central Field Loss on Street-crossing Decision-Making in Young Adult Pedestrians / Essam S. Almutleb in OVS : Optometry & Vision Science, vol. 97,04 (Avril 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97,04 (Avril 2020)
Titre : The Effect of Simulated Central Field Loss on Street-crossing Decision-Making in Young Adult Pedestrians Type de document : article de périodique Auteurs : Essam S. Almutleb ; Shirin E. Hassan Année de publication : 2020 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Acuité visuelle
[Thésaurus Mesh]Dégénérescence maculaire
[Thésaurus Mesh]Marche à pied
[Thésaurus Mesh]Prise de décision
[Thésaurus Mesh]Troubles de la vision
[Thésaurus HELB]:Paramédical:PiétonsMots-clés : eccentric viewing central field loss Résumé : SIGNIFICANCE: This study explored the street-crossing decision-making performance of young normally sighted
subjects with simulated central field loss (CFL). The results suggest that using eccentric viewing enables a person
to make safe and reliable street-crossing decisions.
PURPOSE: This study tested the hypothesis that, as the diameter of an experimentally induced central scotoma
increases, the accuracy and reliability of street-crossing decisions worsen.
METHODS: Street-crossing decisions were measured in 20 young subjects aged between 23 and 31 years while
monocularly viewing a nonsignalized, one-way street for different vehicular arrival times. Using a 5-point rating
scale, subjects judged whether they could cross the street before vehicular arrival with habitual vision and simulated CFL with eccentric viewing. The CFL was induced using soft contact lenses with different central opaque diameters. Using receiver operating characteristic curve analysis, we obtained subjects' accuracy (amount of time in
seconds where subjects either overestimated or underestimated vehicular arrival time relative to their actual crossing time) and reliability (how quickly subjects transitioned from judging insufficient to sufficient time to cross relative to their actual crossing time).
RESULTS: The centrally opaque contact lenses induced central scotomata with a mean (standard deviation) diameter of 17.12° (5.83°). No significant difference in street-crossing accuracy (P = .35) or reliability (P = .09) was
found between the normal, habitual vision and simulated CFL conditions. No statistically significant correlations
were found between scotoma diameter and the accuracy and reliability of subjects' street-crossing decisions
(P = .83 and P = .95, respectively).
CONCLUSIONS: The findings of this study suggest that adopting eccentric viewing enables a person to successfully mitigate the negative effects of an absolute central scotoma on the accuracy and reliability of their streetcrossing decisions.
En ligne : https://journals.lww.com/optvissci/Fulltext/2020/04000/The_Effect_of_Simulated_C [...] Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire The Mind Cannot Go Blind: Effects of Central Vision Loss on Judging One's Crossing Time / Madeline Graber in OVS : Optometry & Vision Science, vol. 97, 06 (Juin 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 06 (Juin 2020) . - p. 406-415
Titre : The Mind Cannot Go Blind: Effects of Central Vision Loss on Judging One's Crossing Time Type de document : article de périodique Auteurs : Madeline Graber ; Shirin E. Hassan Année de publication : 2020 Article en page(s) : p. 406-415 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Analyse spatiale
[Thésaurus Mesh]Auto-évaluation diagnostique
[Thésaurus Mesh]Collecte de données
[Thésaurus Mesh]Dégénérescence maculaire
[Thésaurus Mesh]Temps
[Thésaurus Mesh]Vision faible
[Thésaurus HELB]:Paramédical:PiétonsMots-clés : perte de vision centrale Résumé : SIGNIFICANCE: This study explored whether people with AMD can accurately judge the time they need to cross the street. The results suggest that AMD-related vision loss does not affect a person's ability to estimate his/her own street-crossing time, whereas familiarity with the street does. PURPOSE: The purpose of this study was to assess whether people with AMD could judge accurately their streetcrossing time. METHODS: Fifty-one AMD subjects and 47 age-matched normally sighted subjects (controls) estimated their time to cross a single-lane, one-way street four times (pre-estimate). Then, subjects actually crossed the street four times and subsequently estimated their crossing time four additional times (post-estimate). A linear mixed model with repeated measures for subject was used to determine if the ratio between subjects' estimated and actual crossing times changed as a function of subject group (AMD vs. control) and whether estimates changed before and after actually crossing the street. Univariate correlations and multiple regression analyses were also performed to determine which of the measured experimental variables were the best predictors of a subject's ability to estimate his/her crossing time. RESULTS: No significant difference in crossing ratios were found between the AMD (average, 1.05) and control (average, 1.16) subjects (P = .11). This was true for both the pre-crossing (AMD, 1.09; controls, 1.23; P = .11) and post-crossing ratios (AMD, 1.01; controls, 1.09; P = .17). Both subject groups' crossing ratios, however, decreased significantly going from pre to post (P < .0001). Increased age, longer actual crossing time, and experience gained from previously crossing the street resulted in less overestimation of one's crossing time. CONCLUSIONS: Our data suggest that familiarity with the street as opposed to central vision loss from AMD affects a person's ability to estimate his/her crossing time. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
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