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Détail de l'auteur
Auteur Michael Ntodie
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la rechercheComparison of three gaze-position calibration techniques in first purkinje image–based eye trackers / Michael Ntodie in OVS : Optometry & Vision Science, vol. 96, 08 (Aout 2019)
[article]
in OVS : Optometry & Vision Science > vol. 96, 08 (Aout 2019)
Titre : Comparison of three gaze-position calibration techniques in first purkinje image–based eye trackers Type de document : article de périodique Auteurs : Michael Ntodie ; Shrikant Bharadwaj ; Balaji Saibaba ; Kathryn Saunders ; Julie-Anne Little Année de publication : 2019 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]:S:Strabisme:Strabisme / diagnostic
[Thésaurus Mesh]Collecte de données
[Thésaurus Mesh]Dépistage visuel
[Thésaurus HELB]:Optique:images de Purkinje
[Thésaurus HELB]:Optique:reflet cornéen
[Thésaurus HELB]:Optique:test de HirschbergRésumé : SIGNIFICANCE This study highlights potential differences that can arise in gaze-position estimates from first Purkinje image–based eye trackers based on how individual Hirschberg ratios (HRs) are calculated.
PURPOSE The purpose of this study was to evaluate the accuracy and repeatability of eccentric-viewing, prism-based, and theoretical techniques that are routinely used to calibrate HR in first Purkinje image–based eye trackers.
METHODS Hirschberg ratios of 28 participants (18 to 40 years old) were obtained using the PlusOptix PowerRef 3 photorefractor and eye tracker. In the gold standard eccentric-viewing technique, participants viewed eccentric targets (±12°, 4° steps) at 2 m. In the prism-based technique, 4 to 16Δ-D base-out and base-in prisms were placed in 4Δ-D steps before an eye occluded with an infrared filter; the fellow eye fixated a target at 1 m. Each participant's HR was calculated as the slope of the linear regression of the shift in Purkinje image relative to the pupil center for each target eccentricity or induced prism power. Theoretical HR was calculated from the participant's corneal curvature and anterior chamber depth measures. Data collection was repeated on another visit using all three techniques to assess repeatability. Data were also obtained from an Indian cohort (n = 30, 18 to 40 years old) using similar protocols.
RESULTS Hirschberg ratio ranged from 10.61 to 14.63°/mm (median, 11.90°/mm) in the eccentric-viewing technique. The prism-based and theoretical techniques demonstrated inaccuracies of 12 and 4% relative to the eccentric-viewing technique. The 95% limits of agreement of intrasubject variability were ±2.00, ±0.40, and ±0.30°/mm for the prism-based, eccentric-viewing, and theoretical techniques, respectively (P > .05). Intraclass correlation coefficients (95% confidence interval) were 0.99 (0.98 to 1.00) for eccentric, 0.99 (0.99 to 1.00) for theoretical, and 0.88 (0.74 to 0.94) for prism-based techniques. Similar results were found for the Indian cohort.
CONCLUSIONS The prism-based and theoretical techniques both demonstrated relative inaccuracies in measures of HR compared with the eccentric-viewing technique. The prism-based technique exhibited the poorest repeatability.Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Contact Lens– and Patient-related Factors Associated with Contact Lens Discomfort among Contact Lens Wearers in an African Cohort / Alex Azuka Ilechie in OVS : Optometry & Vision Science, vol. 98, 09 (Septembre 2021)
[article]
in OVS : Optometry & Vision Science > vol. 98, 09 (Septembre 2021)
Titre : Contact Lens– and Patient-related Factors Associated with Contact Lens Discomfort among Contact Lens Wearers in an African Cohort Type de document : article de périodique Auteurs : Alex Azuka Ilechie ; Douglas Danquah ; Michael Ntodie ; Ebenezer Andoh ; Naa Adjeley Addo ; Daniel Odoi ; Felix Otabil ; Frank Assiamah, Auteur Année de publication : 2021 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Afrique
[Thésaurus Mesh]Hygiène
[Thésaurus Mesh]Lentilles de contact
[Thésaurus Mesh]Solutions pour lentilles cornéennes
[Thésaurus HELB]:Optique:port de lentilles de contactRésumé : SIGNIFICANCE
No information is available on contact lens discomfort in any African population. Such information may be helpful in developing the scope and priorities for intervention.
PURPOSE
The purpose of the study was to examine contact lens– and patient-related factors associated with contact lens discomfort among wearers in Ghana.
METHODS
In this multicenter cross-sectional study, contact lens wearers 18 years and older were recruited. The Contact Lens Dry Eye Questionnaire-8 and a standardized scripted interview were administered to 72 contact lens wearers at five clinical sites, and 40 participants' lens storage cases were collected and cultured. A variety of patient- and contact lens–related factors were examined. Univariate and multivariate logistic regression modeling were used to assess risk factors associated with contact lens discomfort.
RESULTS
Seventy-two contact lens wearers aged 18 to 45 years completed the study. The mean age was 27.5 ± 6.4 years, 65.3% of them were females, 86.1% wore soft contact lens, and 13.9% wore rigid gas-permeable lens. Contact lens discomfort was reported by 66.7% of the subjects. Most frequent lens storage cases isolates were Bacillus species (40%) and fungi (31.1%). Significant association was found between disinfecting with tap water (5.98; 95% confidence interval [CI], 1.22 to 29.27; P = .03), heavy visual display terminal use (3.39; 95% CI, 1.01 to 11.34; P = .05), high water content (1.16; 95% CI, 1.02 to 1.33; P = .03), and contact lens discomfort. Demographic factors, wear modality, and care solutions were not significant (all P > .05).
CONCLUSIONS
In considering the use of contact lenses for refractive correction in this population, strategies for preventing contact lens discomfort that should be targeted include use of low-water-content lenses, disinfecting with multipurpose solutions, and reducing the time spent daily on visual display terminal use.Note de contenu : Pas de pdf disponible pour l'instant octobre 2021 Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire