Visual contrast sensitivity in tonic-clonic epileptic patients.

Bezerra, Paloma C.; Alencar, Caroline Costa Gomes; Mousinho, Sandra R.; Santos, Natanael Antônio dos

doi:10.3922/j.psns.2011.1.009

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…CSFs such as the D-15d are presented as very rigorous and useful clinical tools for the evaluation of basic visual functions as well as the visual pathways from the retina to the visual cortex. The possibility of analyzing visual impairments through these tests is important in neurological conditions such as migraine (Mendes, Galdino, Vieira, Simas, & dos Santos, 2011; Shepherd, Hine, & Beaumont, 2013) and epilepsy (Bezerra, Alencar, Mousinho, & dos Santos, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…One of the issues that can be highlighted to explain the impairment in basic visual functions in this patient may be the chronic use of ADHD medications (S. Kim, Chen, & Tannock, 2014), the presence of epilepsy (Bezerra et al, 2011), migraine (Mendes et al, 2011), and the use of an antiepileptic (Hilton, Hosking, & Betts, 2004). It is difficult to exactly point out a direction for the cause of reduced visual function, especially in the left eye, but this rare case brings light to the need for differential diagnosis as soon as possible.…”

Section: Discussionmentioning

confidence: 99%

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Visual function alterations in epilepsy secondary to migraine with aura: A case report.

Fernandes¹,

Souza²,

Santos³

2018

Psychology & Neuroscience

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A 28-year-old White Brazilian female diagnosed with attention-deficit hyperactivity disorder began to experience severe headaches with photosensitivity. After misdiagnosis and inconclusive tests, the exams indicated the presence of idiopathic epilepsy secondary to migraine with aura. Because of the photosensitivity presented during the seizures, our purpose is to report impairments in visual processing after the patient became seizure free. Evaluation of the visual function was performed, including the analysis of contrast sensitivity and color discrimination. The results showed reduction in visual processing. A significant reduction in the contrast sensitivity function and color discrimination was observed for both eyes, with the left eye being more affected than the right eye. Results confirm that there was significant visual impairment compared with the normal pattern for both eyes. Even knowing that this is a rare case, our intent is to open new avenues for research involving photosensitive epilepsy in migraine with aura.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Visual function alterations in epilepsy secondary to migraine with aura: A case report.

Fernandes¹,

Souza²,

Santos³

2018

Psychology & Neuroscience

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“…The Visual Contrast Sensitivity is demonstrated to be an important instrument for its configuration changes according to the luminance conditions, the levels of development and pathological alterations, permitting strong inferences on the basic physiological mechanism, for instance, the functioning of parvo and magnocellular visual pathways (Akutsu & Legge, 1995;Benedek,G., Benedek, K., Kéri, & Janáky, 2003;Elliott & Situ, 1998;Slaghuis & Thompson, 2003;Suttle & Tumer, 2004). In this sense, the Contrast Sensitivity (CS) has been used to assess and diagnose alterations as consequence of optical factors (Owsley et al, 2000), and higher areas and visual pathways (Wesner & Tan, 2006), as well as disturbs not directly related to visual functions such as diabetes (Gualtieri et al, 2011), epilepsy (Bezerra, Alencar, Mousinho, & Santos, 2011), malnutrition (Santos & Alencar, 2010), and Alzheimer and Parkingson diseases (Elliott & Situ, 1998;Polat, Sagi, & Norcia, 1997;Silva et al, 2005;Vleugels, Van Nunen, Lafosse, Ketelaer, & Vandenbussche, 1998), among others.…”

Section: Introductionmentioning

confidence: 99%

Visual contrast sensitivity in adults with schizophrenia and relatives not affected

Nogueira¹,

Santos²

2013

Estud. psicol. (Natal)

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The aim of this study was to measure visual contrast sensitivity (CS) for vertical sine-wave gratings with spatial frequencies of 0,6; 5 and 10 in adults with medicated schizophrenic and no-affected relatives in the range of 20-30 years old. We measured the visual CS for ten volunteers without schizophrenia, nine schizophrenia patients and five no-affected relatives, all volunteers were free from identifiable ocular disease and had normal acuity, except the condition schizophrenia. We use a temporal two-alternative forced-choice psychophysical method with mean luminance of 40.1 cd/m 2 . The results showed maximum contrast sensitivity occurred in the range of 5.0 cpd for both groups and that the visual CS for participants with schizophrenia was lower than those of adults without schizophrenia and the non-affected relatives. These results showed changes in the visual mechanisms that process vertical sine-wave gratings related the schizophrenia.

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“…Além de fazer uma completa descrição do processamento visual espacial, a FSC é sensível a mudanças no decorrer do desenvolvimento e envelhecimento do ser humano. Ou seja, ela é útil no estudo do desenvolvimento e envelhecimento do sistema visual (Mestre e Blin, 1990;França, Santos & Lacerda, 2008; (Kiss et al 2010), transtornos de humor (Colomb et al, 2009;Szabó et al, 2004), epilepsia (Bezerra et al, 2011), desnutrição (Santos, Alencar & Dias 2009, Santos & Alencar, 2010, dentre outras. Uma vez que essas patologias afetam sistemas de neurotransmissão envolvidos também no processamento visual, tais como GABA, dopamina e glutamato, pode-se utilizar a FSC para avaliar a fisiopatologia desses transtornos e sua possível recuperação.…”

Section: Visualunclassified

Processamento visual de contraste em pacientes com depressão maior

Lacerda¹

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The present study aimed to investigate potential changes in visual perception related to major depression. Then, we measure of contrast sensitivity (CS), one of the most used tools to study the humans visual system. The CS has established itself as one tool that allows to study and identify how certain diseases affect the vision and the central nervous system. The study included 33 volunteers aged between 19 and 37 years and they are normal or corrected visual acuity. 11 were diagnosed with major depressive disorder according to DSM-IV and were treated with antidepressants (Depression Group-DG). The other 22 were free of neuropsychiatric disease and were in good health (Control Group-CG). The CS was measured using the psychophysical method of forced choice between two temporal alternatives (2AF). Were tested linear spatial frequencies of 0.5, 2.5, 10 and 20 cycles per degree of visual angle (cpd) and the angular frequencies of 2, 4, 24, 48 and 96 cycles/360º. The stimuli were circular and were presented on a video monitor LG 19-inch RGB (screen resolution of 1024 x 768 pixels at 75 Hz) connected to a microcomputer and a BITS + + (Cambridge Research Systems). The average luminance of the display was 41.05 cd / m² measured by a photometer ColorCal (Cambridge Research Systems). The measurements were performed at a distance of 300 cm from the monitor screen. The stimuli were displayed in successive pairs, with a frequency tested (linear or angular) and the other was a gray circle with uniform luminance. Participants were instructed to press the left mouse's button when the test stimulus was presented first, and the right button when the stimulus was presented second. The results showed an interaction effect for the linear spatial frequency [F (3, 93) = 6.0814, p = 0.0008], the test post-hoc Newmann Kels showed significant difference in frequency of 0.5 cpd. The results for the angular frequencies showed a marginally significant effect of interaction. The analyzes with post-hoc showed a marginally significant difference for frequency of 2 cycles/360º. These results suggest changes in the CS of patients with major depression medicated.

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Visual contrast sensitivity in tonic-clonic epileptic patients.

Cited by 4 publications

References 26 publications

Visual function alterations in epilepsy secondary to migraine with aura: A case report.

Visual function alterations in epilepsy secondary to migraine with aura: A case report.

Visual contrast sensitivity in adults with schizophrenia and relatives not affected

Processamento visual de contraste em pacientes com depressão maior

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