A visão através dos contrastes

Souza, Givago da Silva; Lacerda, Eliza Maria da Costa Brito; Silveira, Vladímir de Aquino; Araújo, Carolina dos Santos; Silveira, Luiz Carlos de Lima

doi:10.1590/s0103-40142013000100005

Cited by 5 publications

(4 citation statements)

References 66 publications

(63 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Its use as a tool for the study of visual dysfunction is a good example of how research, initially motivated by the desire to understand the workings of the visual system, can be used in medical applications. Moreover, this kind of knowledge has been used in industry to guide the design of optical and optoelectronic devices such as televisions with high spatial and temporal resolution ( 29 ).…”

Section: Introductionmentioning

confidence: 99%

Acute effect of alcohol intake on sine-wave Cartesian and polar contrast sensitivity functions

Galdino

Silva

Mendes

et al. 2014

Braz J Med Biol Res

View full text Add to dashboard Cite

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 of 1, 2, 4, 24, 48, and 96 cycles/360°. Twenty adults free of ocular diseases, with normal or corrected-to-normal visual acuity, and no history of alcoholism were enrolled in two experimental groups: 1) no alcohol intake (control group) and 2) alcohol ingestion (experimental group). The average concentration of alcohol in the experimental group was set to about 0.08%. We used a paradigm involving a forced-choice method. Maximum sensitivity to contrast for sine-wave gratings in the two groups occurred at 4 cpd sine-wave gratings and at 24 and 48 cycles/360° for angular frequency stimuli. Significant changes in contrast sensitivity were observed after alcohol intake compared with the control condition at spatial frequency of 4 cpd and 1, 24, and 48 cycles/360° for angular frequency stimuli. Alcohol intake seems to affect the processing of sine-wave gratings at maximum sensitivity and at the low and high frequency ends for angular frequency stimuli, both under photopic luminance conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Acute effect of alcohol intake on sine-wave Cartesian and polar contrast sensitivity functions

Galdino

Silva

Mendes

et al. 2014

Braz J Med Biol Res

View full text Add to dashboard Cite

show abstract

“…Considering CS under photopic conditions, the ZMB00 lens showed better results at high spatial frequencies (p<0.05). Low spatial frequencies are associated with the perception of motion (magnocellular pathway), whereas high frequencies are associated with the perception of detail (parvocellular pathway) (26) . Hida et al compared the SN60D3 IOL to the ZM900 IOL and found similar results applicable to this study since SN6AD1 and ZMB00 lenses are the evolution of the SN60D3 and ZM900 IOLs (13) .…”

Section: Discussionmentioning

confidence: 99%

Comparative study on optical performance and visual outcomes between two diffractive multifocal lenses: AMO Tecnis® ZMB00 and AcrySof® IQ ReSTOR® Multifocal IOL SN6AD1

Chaves¹,

Hida²,

Tzeliks³

et al. 2016

Arquivos Brasileiros De Oftalmologia

View full text Add to dashboard Cite

Purpose: To compare the optical performance and visual outcomes between two diffractive multifocal lenses: AMO Tecnis® ZMB00 and AcrySof® ReSTOR® SN6AD1. Methods: This prospective, non-randomized comparative study included the assessment of 74 eyes in 37 patients referred for cataract surgery and candidates for multifocal intraocular lens implants. Exclusion criteria included existence of any other eye disease, previous eye surgery, high axial myopia, preoperative corneal astigmatism of >1.00 cylindrical diopter (D), and intraoperative or postoperative complications. Ophthalmological evaluation included the measurement of uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), distance-corrected near visual acuity (DCNVA), and distance-corrected intermediate visual acuity (DCIVA), with analysis of contrast sensitivity (CS), wavefront, and visual defocus curve. Results: Postoperative UDVA was 0.09 and 0.08 logMAR in the SN6AD1 and ZMB00 groups, respectively (p=0.868); postoperative CDVA was 0.04 and 0.02 logMAR in the SN6AD1 and ZMB00 groups, respectively (p=0.68); DCIVA was 0.17 and 0.54 logMAR in the SN6AD1 and ZMB00 groups, respectively (p=0.000); and DCNVA was 0.04 and 0.09 logMAR in the SN6AD1 and ZMB00 groups, respectively (p=0.001). In both cases, there was an improvement in the spherical equivalent and UDVA (p<0.05). Under photopic conditions, the SN6AD1 group had better CS at low frequencies without glare (p=0.04); however, the ZMB00 group achieved better sensitivity at high frequencies with glare (p=0.003). The SN6AD1 and ZMB00 lenses exhibited similar behavior for intermediate vision, according to the defocus curve; however, the ZMB00 group showed a shorter reading distance than the SN6AD1 group. There were no significant differences regarding aberrometry between the two groups. Conclusion: Both lenses promoted better quality of vision for both long and short distances and exhibited a similar behavior for intermediate vision. The SN6AD1 and ZMB00 groups showed better results for CS under photopic conditions at low and high spatial frequencies, respectively. Keywords

show abstract

“…(Campbell & Maffei, 1974). Isso leva a alguns autores a dizer que um objeto só consegue ser identificado caso haja contraste entre ele e o ambiente ao seu redor (Souza et al, 2013 (Schwartz, 2009).…”

Section: I123 Campos Receptivos Do Núcleo Geniculado Lateral (Ngl)unclassified

Relação entre sensibilidade ao contraste e julgamento de expressões faciais de emoções em crianças de 6 a 14 anos

Coelho¹

View full text Add to dashboard Cite

Ao Marcelo da Costa Fernandes, meu orientador, que teve paciência comigo durante esses anos, me auxiliando, orientando, guiando, ensinando, me ajudando no meu crescimento e na conquista do meu objetivo, obrigada! Ao pessoal do Lab Visual que me apoiou, escutou, auxiliou, orientou, e aguentou durante esses anos. À Elis, que com seus abraços reconfortantes me trouxe paz no meio do caos. À Heydi, que com seu sorriso trouxe luz aos meus dias. À Andréa que foi a peça inicial nessa história, que me incentivou e auxiliou durante esses árduos anos. Ao Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ), pela concessão da bolsa de mestrado e pelo apoio financeiro para a realização desta pesquisa. Ao meu marido, que com muita paciência, carinho e amor, esteve ao meu lado a todo instante, me apoiando e incentivando. Acreditando em mim quando eu mesma não acreditei, obrigada! Sem você, essa conquista seria impossível! Aos meus pais que me deram a oportunidade de trilhar os caminhos desde o início, me orientando, auxiliando e ensinando valores que levarei para sempre comigo. Amo vocês! À Silvia, que se tornou uma pessoa essencial, sem a qual eu não teria conseguido ter forças, nem capacidade para alcançar esse ou qualquer objetivo na minha vida. À Célia, que conquistou um espaço importante nessa minha jornada e que tenho muito carinho. Aos meus irmãos Marcelo e Fernanda, que são um exemplo para mim. Ao meu avô Manuel, exemplo de trabalhador, e minha avó Inês, guerreira que tem ensinado tanto a todos nós, obrigada! Palavras-chave: Sensibilidade ao contraste; julgamento de emoções; desenvolvimento; percepção de faces.

show abstract

A visão através dos contrastes

Cited by 5 publications

References 66 publications

Acute effect of alcohol intake on sine-wave Cartesian and polar contrast sensitivity functions

Acute effect of alcohol intake on sine-wave Cartesian and polar contrast sensitivity functions

Comparative study on optical performance and visual outcomes between two diffractive multifocal lenses: AMO Tecnis® ZMB00 and AcrySof® IQ ReSTOR® Multifocal IOL SN6AD1

Relação entre sensibilidade ao contraste e julgamento de expressões faciais de emoções em crianças de 6 a 14 anos

Contact Info

Product

Resources

About