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Détail de l'auteur
Auteur Viswanathan Ramasubramanian
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la rechercheAccommodative Behavior, Hyperopic Defocus, and Retinal Image Quality in Children Viewing Electronic Displays / Raman Prasad Sah in OVS : Optometry & Vision Science, vol. 97, 08 (Aout 2020)
[article]
in OVS : Optometry & Vision Science > vol. 97, 08 (Aout 2020)
Titre : Accommodative Behavior, Hyperopic Defocus, and Retinal Image Quality in Children Viewing Electronic Displays Type de document : article de périodique Auteurs : Raman Prasad Sah ; Viswanathan Ramasubramanian ; Olivia Reed ; Dawn Meyer ; Arthur Bradley ; Pete Kollbaum Année de publication : 2020 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Accommodation oculaire
[Thésaurus Mesh]Enfant
[Thésaurus Mesh]Myopie
[Thésaurus Mesh]Prévalence
[Thésaurus HELB]:Paramédical:écrans numériquesPermalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Myopia Control Dose Delivered to Treated Eyes by a Dual-focus Myopia-control Contact Lens / Viswanathan Ramasubramanian in OVS : Optometry & Vision Science, vol. 100, 06 (Juin 2023)
[article]
in OVS : Optometry & Vision Science > vol. 100, 06 (Juin 2023)
Titre : Myopia Control Dose Delivered to Treated Eyes by a Dual-focus Myopia-control Contact Lens Type de document : article de périodique Auteurs : Viswanathan Ramasubramanian ; Nicola Logan ; Susie Jones ; Dawn Meyer ; Matt Jaskulski ; Martin Rickert ; Paul Chamberlain ; Baskar Arumugam ; Arthur Bradley ; Pete Kollbaum Année de publication : 2023 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Collecte de données
[Thésaurus Mesh]Enfant
[Thésaurus Mesh]Lentilles de contact
[Thésaurus Mesh]Myopie
[Thésaurus Mesh]ThérapeutiqueMots-clés : lentille de contact à double foyer Résumé : SIGNIFICANCE: Consistent with closed-loop models of regulated eye growth, a successful dual-focus (DF) myopiacontrol contact lens focused a significant proportion of light anterior to the central retina in eyes of treated children viewing near and distant targets. PURPOSE: This study examined the optical impact of a DF contact lens during near viewing in a sample of habitual DF lens wearing children. METHODS: Seventeen myopic children aged 14 to 18 years who had completed 3 or 6 years of treatment with a DF contact lens (MiSight 1 Day; CooperVision, Inc., San Ramon, CA) were recruited and fit bilaterally with the DF and a single-vision (Proclear 1 Day; CooperVision, Inc.) contact lens. Right eye wavefronts were measured using a pyramidal aberrometer (Osiris; CSO, Florence, Italy) while children accommodated binocularly to high-contrast letter stimuli at five target vergences. Wavefront error data were used to compute pupil maps of refractive state. RESULTS: During near viewing, children wearing single-vision lenses accommodated on average to achieve approximate focus in the pupil center but, because of combined accommodative lag and negative spherical aberration, experienced up to 2.00 D of hyperopic defocus in the pupil margins. With DF lenses, children accommodated similarly achieving approximate focus in the pupil center. When viewing three near distances (0.48, 0.31, and 0.23 m), the added +2.00 D within the DF lens treatment optics shifted the mean defocus from +0.75 to −1.00 D. The DF lens reduced the percentage of hyperopic defocus (≥+0.75 D) in the retinal image from 52 to 25% over these target distances, leading to an increase in myopic defocus (≤−0.50 D) from 17 to 42%. CONCLUSIONS: The DF contact lens did not alter the accommodative behavior of children. The treatment optics introduced myopic defocus and decreased the amount of hyperopically defocused light in the retinal image. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire Validation of a clinical aberrometer using pyramidal wavefront sensing / Neeraj K. Singh in OVS : Optometry & Vision Science, vol. 96, 10 (Octobre 2019)
[article]
in OVS : Optometry & Vision Science > vol. 96, 10 (Octobre 2019)
Titre : Validation of a clinical aberrometer using pyramidal wavefront sensing Type de document : article de périodique Auteurs : Neeraj K. Singh ; Matt Jaskulski ; Viswanathan Ramasubramanian ; Dawn Meyer ; Olivia Reed ; Martin Rickert ; Arthur Bradley ; Pete Kollbaum Année de publication : 2019 Langues : Français (fre) Descripteurs (mots clés) : [Thésaurus Mesh]Dépistage visuel
[Thésaurus Mesh]Réfraction oculaire
[Thésaurus Mesh]Troubles de la réfraction oculaire
[Thésaurus HELB]:Optique:aberromètreRésumé : SIGNIFICANCE: Measurement of ocular aberrations is a critical component of many optical corrections. PURPOSE: This study examines the accuracy and repeatability of a newly available high-resolution pyramidal wavefront sensor–based aberrometer (Osiris by Costruzione Strumenti Oftalmici, Firenze, Italy). METHODS: An engineered model eye and a dilated presbyopic eye were used to assess accuracy and repeatability of aberration measurements after systematic introduction of lower- and higher-order aberrations with calibrated trial lenses (sphere +10.00 to −10.00 D, and astigmatic −4.00 and −2.00 D with axis 180, 90, and 45°) and phase plates (−0.57 to 0.60 μm of Seidel spherical aberration defined over a 6-mm pupil diameter). Osiris aberration measurements were compared with those acquired on a previously calibrated COAS-HD aberrometer for foveal and peripheral optics both with and without multizone dual-focus contact lenses. The impact of simulated axial and lateral misalignment was evaluated. RESULTS: Root-mean-square errors for paraxial sphere (corneal plane), cylinder, and axis were, respectively, 0.07, 0.11 D, and 1.8° for the engineered model and 0.15, 0.26 D, and 2.7° for the presbyopic eye. Repeatability estimates (i.e., standard deviation of 10 repeat measures) for the model and presbyopic eyes were 0.026 and 0.039 D for spherical error. Root-mean-square errors of 0.01 and 0.02 μm, respectively, were observed for primary spherical aberration and horizontal coma (model eye). Foveal and peripheral measures of higher- and lower-order aberrations measured with the Osiris closely matched parallel data collected with the COAS-HD aberrometer both with and without dual-focus zonal bifocal contact lenses. Operator errors of focus and alignment introduced changes of 0.018 and 0.02 D/mm in sphere estimates. CONCLUSIONS: The newly available clinical pyramidal aberrometer provided accurate and repeatable measures of lower- and higher-order aberrations, even in the challenging but clinically important cases of peripheral retina and multifocal optics. Permalink : https://bibliotheque.helb-prigogine.be/opac_css/index.php?lvl=notice_display&id= [article]Exemplaires
Cote Support Localisation Section Disponibilité aucun exemplaire