Contrast Sensitivity Function
Mostrando 1-12 de 218 artigos, teses e dissertações.
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1. Combined influence of illness duration and medication type on visual sensitivity in schizophrenia
Objective: Patients with schizophrenia have visual processing impairments. The main findings from the literature indicate that these deficits may be related to differences in paradigms, medications, and illness duration. This study is part of a large-scale study investigating visual sensitivity in schizophrenia. Here we aimed to investigate the combined eff
Braz. J. Psychiatry. Publicado em: 2020-02
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2. Combined influence of illness duration and medication type on visual sensitivity in schizophrenia
Objective: Patients with schizophrenia have visual processing impairments. The main findings from the literature indicate that these deficits may be related to differences in paradigms, medications, and illness duration. This study is part of a large-scale study investigating visual sensitivity in schizophrenia. Here we aimed to investigate the combined eff
Braz. J. Psychiatry. Publicado em: 01/07/2019
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3. Acute effect of alcohol intake on sine-wave Cartesian and polar contrast sensitivity functions
The aim of this study was to assess contrast sensitivity for angular frequency stimuli as well as for sine-wave gratings in adults under the effect of acute ingestion of alcohol. We measured the contrast sensitivity function (CSF) for gratings of 0.25, 1.25, 2.5, 4, 10, and 20 cycles per degree of visual angle (cpd) as well as for angular frequency stimuli o
Braz J Med Biol Res. Publicado em: 21/03/2014
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4. Differential effects of aging on spatial contrast sensitivity to linear and polar sine-wave gratings
Changes in visual function beyond high-contrast acuity are known to take place during normal aging. We determined whether sensitivity to linear sine-wave gratings and to an elementary stimulus preferentially processed in extrastriate areas could be distinctively affected by aging. We measured spatial contrast sensitivity twice for concentric polar (Bessel) a
Braz J Med Biol Res. Publicado em: 02/10/2013
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5. Contrast sensitivity after refractive lens exchange with a multifocal diffractive aspheric intraocular lens
PURPOSE: To evaluate distance and near contrast sensitivity (CS) under photopic and mesopic conditions before and after refractive lens exchange (RLE) and implantation of the aspheric AcrySof®ReSTOR® (SN6AD3 model) intraocular lens (IOL). METHODS:Seventy-four eyes of 37 patients after RLE underwent bilateral implantation with the aspheric AcrySof ReSTOR IO
Arq. Bras. Oftalmol.. Publicado em: 2013-04
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6. Chromatic spatial contrast sensitivity estimated by visual evoked cortical potential and psychophysics
The purpose of the present study was to measure contrast sensitivity to equiluminant gratings using steady-state visual evoked cortical potential (ssVECP) and psychophysics. Six healthy volunteers were evaluated with ssVECPs and psychophysics. The visual stimuli were red-green or blue-yellow horizontal sinusoidal gratings, 5° × 5°, 34.3 cd/m2 mean luminan
Braz J Med Biol Res. Publicado em: 01/02/2013
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7. Comparative neurophysiology of spatial luminance contrast sensitivity
The luminance contrast sensitivity function has been investigated using behavioral and electrophysiological methods in many vertebrate species. Some features are conserved across species as a shape of the function, but other features, such as the contrast sensitivity peak value, spatial frequency contrast sensitivity peak, and visual acuity have changed. Her
Psychology & Neuroscience. Publicado em: 2011-06
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8. Psychophysical measurements of luminance and chromatic spatial and temporal contrast sensitivity in Duchenne muscular dystrophy
In children with Duchenne muscular dystrophy, color vision losses have been related to dystrophin deletions downstream of exon 30, which affect a dystrophin isoform, Dp260, present in the retina. To further evaluate visual function in DMD children, we measured spatial, temporal, and chromatic red-green and blue-yellow contrast sensitivity in two groups of DM
Psychology & Neuroscience. Publicado em: 2011-06
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9. Single-pass measurement of the optical quality of the opossum eye
This paper reports the results that are part of a series of experiments designed to evaluate aspects of the spatial resolution of the visual system of the opossum, Didelphis marsupialis aurita. This nocturnal marsupial presents a well-developed eye, displaying features that reflect specialization for operation at low levels of luminosity. The species was sho
Psychology & Neuroscience. Publicado em: 2011-06
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10. Estudo comparativo entre a ceratectomia fotorrefrativa e a ceratomileusis in situ a laser guiadas pela análise de frente de onda / Comparative study between wavefront-guided photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK)
PURPOSE: To compare clinical results of two wavefront-guided treatments, photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK), for low to moderate myopia correction, with or without astigmatism. SETTING: Refractive Surgery Service, General Hospital, University Of São Paulo, São Paulo, Brazil. METHODS: Prospective randomized study of 7
Publicado em: 2010
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11. Development of an optical fluorescence imaging system for medical use / Desenvolvimento de um sistema por imagem de fluorescência óptica para uso médico-odontológico
Optical fluorescence has been applied to several medical areas, as to monitor drug degradation and cancer detection, due to its high sensitivity, simplicity and fast response. Non-invasive and non-destructive assessment of tissues using this technique is very attractive for clinical diagnosis. Hence, the aim of was the development of an optical fluorescence
Publicado em: 2010
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12. Contrast sensitivity function of sine-wave gratings in children with acute malnutrition
The aim of this study was to determine the contrast sensitivity curves of sine-wave gratings with spatial frequencies of 0.25, 1.0, 2.0 and 8.0 cycles per degree (cpd) of visual angle in 16 female subjects aged 7 to 9 years old, eight well-nourished and eight with acute protein-energy malnutrition (PEM). All participants had normal visual acuity and were fre
Psychology & Neuroscience. Publicado em: 2009-06