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Auteur Clara Llorens-Quintana
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Ajouter le résultat dans votre panier Affiner la rechercheSubjective and Objective Evaluation of the Effect of Blink Type on Tear-film Breakup Time and Its Estimation / Dorota Szczesna-Iskander in OVS : Optometry & Vision Science, vol. 97, 11 (Novembre 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 11 (Novembre 2020)
Titre : Subjective and Objective Evaluation of the Effect of Blink Type on Tear-film Breakup Time and Its Estimation Type de document : article de périodique Auteurs : Dorota Szczesna-Iskander ; Clara Llorens-Quintana Année de publication : 2020 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Clignement
[Thésaurus Mesh]Étude comparative
[Thésaurus Mesh]Fluorescéine
[Thésaurus Mesh]Syndromes de l'oeil sec
[Thésaurus HELB]:Paramédical:film lacrymalMots-clés : vidéokératoscope Résumé : SIGNIFICANCE: While evaluating the tear-film breakup time, a careful set of precise instructions should be given to the subjects regarding the blink type because it substantially impacts the assessment of tear-film surface quality. PURPOSE: The purpose of this study was to determine to what extent the type of blink affects the tear-film breakup time and its assessment using two types of videokeratoscopes and the fluorescein test. METHODS: Thirty-three volunteers were assessed considering two different types of blinks: natural (short) and forced (unnaturally prolonged). Objective noninvasive breakup time estimation was performed using Oculus Keratograph 5M and Medmont E300, both equipped with tear-film analysis modules, followed by the fluorescein test. In addition, while overviewing videokeratoscopy recordings, noninvasive breakup time was assessed subjectively by one experienced observer marking the first noticeable distortion in the Placido-disk pattern. Statistical analyses included two-way ANOVA and paired-sample t test. The agreement between blinking and measuring modalities was assessed using Bland-Altman plots. RESULTS: Forced blink significantly shortened the tear-film breakup time in all measuring modalities (two-way ANOVA, P = .003). The mean difference between breakup time after natural and forced blink was 3.2 (P = .002), 2.4 (P = .005), and 2.1 seconds (P = .002), for Keratograph 5M, E300, and fluorescein test, respectively. The group median of differences between objective and subjective noninvasive breakup time was less than 1 second with both videokeratoscopes. The objective noninvasive breakup time measured with Keratograph 5M was significantly longer than those with E300 and fluorescein test (both P < .001). No statistically significant difference was found between E300 objective assessment and fluorescein test (P = .19). CONCLUSIONS: Forced blinks affect the assessment of tear-film stability. Hence, attention should be given in instructing the subjects before tear-film breakup time evaluation irrespectively to the method of measurement. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Supporting dry eye diagnosis with a new method for noninvasive tear film quality assessment / Clara Llorens-Quintana in OVS : Optometry & Vision Science, vol. 96, 02 (Février 2019)
[article]
in OVS : Optometry & Vision Science > vol. 96, 02 (Février 2019) . - p. 103-110
Titre : Supporting dry eye diagnosis with a new method for noninvasive tear film quality assessment Type de document : article de périodique Auteurs : Clara Llorens-Quintana ; Dorota Szczesna-Iskander ; Robert Iskander Année de publication : 2019 Article en page(s) : p. 103-110 Langues : Anglais (eng) Langues originales : Anglais (eng) Descripteurs (mots clés) : [Thésaurus Mesh]:S:Syndromes de l'oeil sec:Syndromes de l'oeil sec / diagnostic
[Thésaurus Mesh]Méthodes
[Thésaurus Mesh]Syndromes de l'oeil sec
[Thésaurus HELB]:Optique:Film lacrymal
[Thésaurus HELB]:Optique:vidéokératoscopieRésumé :
SIGNIFICANCE Noninvasive high-speed videokeratoscopy equipped with specific software has shown potential for assessing the homeostasis of tear film, providing clinicians with a fast and consistent tool for supporting dry eye diagnosis and management.
PURPOSE The purpose of this study was to evaluate the efficacy of a recently proposed method for characterizing tear film dynamics using noninvasive high-speed videokeratoscopy in assessing the loss of homeostasis of tear film.
METHODS Thirty subjects from a retrospective study, of which 11 were classified as dry eye and 19 as healthy, were included. High-speed videokeratoscopy measurements were performed using E300 videokeratoscope (Medmont Pty., Ltd., Melbourne, Australia). Raw data were analyzed using a recently proposed method to estimate the dynamics of the tear film based on a fractal dimension approach. This method provides three time-varying indicators related to the regularity of the reflected rings: tear film surface quality indicator, breaks feature indicator, and distortions feature indicator. From each indicator, five parameters were extracted and analyzed, including noninvasive breakup time, mean value of the indicator in the stability phase, mean value of the indicator in the whole interblink interval, mean value of the indicator in the leveling phase, and the general trend of the time series. Receiver operating characteristic curves were used to determine the sensitivity and specificity of each parameter in dry eye detection.
RESULTS The best discrimination performance between dry eye and healthy subjects was achieved with the breaks feature indicator noninvasive breakup time parameter, with an area under the curve of 0.85. For a cutoff value of 10 seconds, the sensitivity was 100% and the specificity was 84%.
CONCLUSIONS The analyzed method improves the assessment of tear film homeostasis in comparison with previous high-speed videokeratoscopy methods showing higher potential in assisting dry eye diagnosis.
Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
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