Search results for "binocular"
showing 10 items of 89 documents
Visual function after implantation of an aspheric bifocal intraocular lens.
2009
Purpose To evaluate distance, intermediate, and near vision after bifocal aspheric AcrySof ReSTOR SN6AD1 intraocular lens (IOL) implantation. Setting Fernandez-Vega Ophthalmological Institute, Oviedo, Spain. Methods Binocular distance best corrected visual acuity (BCVA) (4.0 m), best distance-corrected near (40.0 cm) and intermediate (70.0, 60.0, 50.0 cm) acuities, and contrast sensitivity under photopic (85.0 candelas [cd]/m 2 ) and mesopic (3.0 cd/m 2 ) conditions with and without glare were measured postoperatively. A patient-satisfaction and visual phenomena questionnaire was administered. Results Six months postoperatively, the mean acuities (logMAR) were binocular BCVA, −0.064 ± 0.049…
Visual function after bilateral implantation of a new zonal refractive aspheric multifocal intraocular lens.
2011
Purpose To evaluate visual function after bilateral implantation of a zonal refractive aspheric multifocal intraocular lens (IOL). Setting Private practice surgery center, Valencia, Spain. Design Cohort study. Methods Consecutive eyes with cataract had bilateral implantation of Lentis Mplus LS-312 multifocal IOLs. Distance, intermediate, and near visual acuities; contrast sensitivity; defocus curves; and a quality-of-vision questionnaire, including presence of halos or dysphotopsia, were evaluated 6 months postoperatively. A control group of age-matched monofocal pseudophakic patients was included to compare contrast sensitivity function. Results In the multifocal group, the mean binocular …
Multifocal intraocular lenses for unilateral cataract in children.
2009
Purpose To evaluate the implantation of apodized diffractive multifocal intraocular lenses (IOLs) in children with unilateral cataract. Setting Ophthalmology Service, Hospital Clinico Lozano Blesa, Zaragoza, Spain. Design Prospective clinical study. Methods Five children between 4 and 6 years of age with unilateral cataract had cataract extraction and implantation of an apodized diffractive multifocal IOL (AcrySof Restor SN60D3). Phacoaspiration was accompanied by posterior capsulorhexis followed by an anterior vitrectomy. Uncorrected distance (UDVA), corrected distance (CDVA), and corrected near (CNVA) visual acuities; binocular function using the Worth 4-dot test and the TNO stereotest; a…
Time response of the vision binocularity by use of dynamic suppression of retinal images
1999
We present a novel technique for determination the stereopsis dynamic response, using as stimulus a random dot stereopair. Stereopsis can be evoked or depressed by continuous or flash illumination of the stimulus with simultaneous control of a special light scattering obstacle build in the visual path of one eye. The obstacle--a thin plate of electrooptical PLZT ceramics-- exposes (by applying of the voltage to semitransparent gold electrodes deposited on both surfaces of the plate) light scattering so blurring the retinal image, similar as for an eye with a cataract, depressing stereopsis. The random dot stereopair contains contours of images with a different stereodisparity. The PLZT plat…
Are near visual signs and symptoms in multiple sclerosis compatible with convergence insufficiency?
2021
Clinical relevance: Optometric management of neurodegenerative diseases is essential since visual signs, such as double vision, visual acuity reduction, or oculomotricity dysfunctions, are usually present in these subjects over the course of the disease. The present paper can guide clinicians in better managing their patients with multiple sclerosis. Background: Patients with multiple sclerosis present near vision symptoms that may be related to binocular anomalies, but these symptoms have not been investigated and related to specific signs. The aim of the present study was to evaluate the binocular vision in subjects with multiple sclerosis, and to analyse if the near visual signs and symp…
Seeing with the visual cortex
1984
A short analysis of the input-output organization of the primary visual cortical areas in the cat and monkey is followed by a description of the salient microelectrophysiological properties of retino-geniculo-cortical system neurons. It is concluded that a strict hierarchical model of cortical processing of visual information is no longer tenable.
Curso de prácticas de Optometria II : práctica 6 oculomotor
2020
Esta publicación surge con la finalidad de servir de guía, consulta y orientación para que el estudiantado, (o las personas interesadas en el tema), puedan ir siguiendo un orden de pruebas y de pasos durante la realización de la actividad relacionada con la evaluación de la visión binocular. Nuestro objetivo general es facilitar que se consoliden las bases prácticas necesarias para la evaluación óptima de la visión binocular en cada una de las partes que la componen. En esta publicación, correspondiente a la práctica 6, se muestra como realizar las pruebas oculomotoras, permitiendo con estas pruebas conocer una parte fundamental del estado del sistema binocular.
Curso de prácticas de Optometria II : práctica 7 terapia visual
2020
Esta publicación surge con la finalidad de servir de guía, consulta y orientación para que el estudiantado, (o las personas interesadas en el tema), puedan ir siguiendo un orden de pruebas y de pasos durante la realización de la actividad relacionada con la evaluación de la visión binocular. Nuestro objetivo general es facilitar que se consoliden las bases prácticas necesarias para la evaluación óptima de la visión binocular en cada una de las partes que la componen. En esta publicación, correspondiente a la práctica 7, se muestra como realizar los ejercicios programados de terapia visual, permitiendo con estas pruebas optimizar el sistema binocular del paciente.
Revisió bibliogràfica dels diferents mètodes de mesura de la dominància ocular i la seua relació amb la lateralitat i l’aprenentatge
2020
En l’àmbit de l’educació es defineix la lateralitat creuada com la no coincidència de les dominàncies manual, podal, ocular o auditiva. Hi ha estudis que relacionen la lateralitat creuada amb els problemes d’aprenentatge. No obstant això, la literatura en el camp de les ciències de la visió descriu tres tipus de dominàncies oculars, independents entre si. L’objectiu d’aquesta revisió bibliogràfica és buscar la relació entre les dominàncies oculars i la lateralitat. La recerca es realitzà a través de la base de dades PubMed, amb les paraules clau “Ocular Dominance”, “Binocular Vision” i “Functional Laterality”. S’obtingueren com a resultat 54 publicacions en revistes d’impacte, de les quals …
Eccentric fixation measurements using visuoscopy and Macula Integrity Tester (MIT) in children with amblyopia
2021
The aim of the work was to compare measurements of eccentric fixation in children with amblyopia using two different methods, a traditional visuoscopy and MIT. Monocular fixation was evaluated using visuoscopy and MIT in 16 patients (from 5 to 9 years old). Measurements were started with the better seeing eye to compare the results obtained with the amblyopic eye. All study participants were selected with anisometropic and refractive amblyopia. Visuoscopy is simpler than MIT and less dependent on patient responses, so visioscopy can be used for young children who have not yet acquired verbal skills. Children over the age of 5 can more easily understand the MIT method and get more reliable r…