Avaliação da sensibilidade ao contraste em pacientes com migrânea

Mendes, Liana Chaves; Galdino, Melyssa Kellyane Cavalcanti; Vieira, Jákina Guimarães; Simas, Maria Lúcia de Bustamante; Santos, Natanael Antônio dos

doi:10.1590/s0103-65642011005000010

Cited by 5 publications

(4 citation statements)

References 38 publications

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“…Although contrast sensitivity provides an overall measure of visual sensitivity, there are many facets to the potential differences in people with or without aura that it is unable to capture. This is likely to account for the fact that previous findings are not robust [22], with some studies showing impaired contrast sensitivity [18,25,27,30,31,37,71,72], and others [15,[32][33][34]39,73] showing no such deficits.…”

Section: Discussionmentioning

confidence: 94%

No Evidence of Reduced Contrast Sensitivity in Migraine-with-Aura for Large, Narrowband, Centrally Presented Noise-Masked Stimuli

Asher

O’Hare

Hibbard

2021

Vision

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Individuals with migraine aura show differences in visual perception compared to control groups. Measures of contrast sensitivity have suggested that people with migraine aura are less able to exclude external visual noise, and that this relates to higher variability in neural processing. The current study compared contrast sensitivity in migraine with aura and control groups for narrow-band grating stimuli at 2 and 8 cycles/degree, masked by Gaussian white noise. We predicted that contrast sensitivity would be lower in the migraine with aura group at high noise levels. Contrast sensitivity was higher for the low spatial frequency stimuli, and decreased with the strength of the masking noise. We did not, however, find any evidence of reduced contrast sensitivity associated with migraine with aura. We propose alternative methods as a more targeted assessment of the role of neural noise and excitability as contributing factors to migraine aura.

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Section: Discussionmentioning

confidence: 94%

No Evidence of Reduced Contrast Sensitivity in Migraine-with-Aura for Large, Narrowband, Centrally Presented Noise-Masked Stimuli

Asher

O’Hare

Hibbard

2021

Vision

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“…One of the most basic ways in which visual performance might differ interictally between migraine and control groups is in contrast sensitivity. While there is some evidence that contrast sensitivity is reduced in individuals with migraine [40,41,42,43], the findings are inconsistent [16]. Some studies have found evidence for poorer contrast sensitivity in migraine when testing with large [44] or peripherally presented stimuli, but not when testing with centrally presented stimuli [9].…”

Section: Discussionmentioning

confidence: 99%

Typical Lateral Interactions, but Increased Contrast Sensitivity, in Migraine-With-Aura

Asher

O’Hare

Romei

et al. 2018

Vision

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Individuals with migraine show differences in visual perception compared to control groups. It has been suggested that differences in lateral interactions between neurons might account for some of these differences. This study seeks to further establish the strength and spatial extent of excitatory and inhibitory interactions in migraine-with-aura using a classic lateral masking task. Observers indicated which of two intervals contained a centrally presented, vertical Gabor target of varying contrast. In separate blocks of trials, the target was presented alone or was flanked by two additional collinear, high contrast Gabors. Flanker distances varied between 1 and 12 wavelengths of the Gabor stimuli. Overall, contrast thresholds for the migraine group were lower than those in the control group. There was no difference in the degree of lateral interaction in the migraine group. These results are consistent with the previous work showing enhanced contrast sensitivity in migraine-with-aura for small, rapidly presented targets, and they suggest that impaired performance in global perceptual tasks in migraine may be attributed to difficulties in segmenting relevant from irrelevant features, rather than altered local mechanisms.

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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%

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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Avaliação da sensibilidade ao contraste em pacientes com migrânea

Cited by 5 publications

References 38 publications

No Evidence of Reduced Contrast Sensitivity in Migraine-with-Aura for Large, Narrowband, Centrally Presented Noise-Masked Stimuli

No Evidence of Reduced Contrast Sensitivity in Migraine-with-Aura for Large, Narrowband, Centrally Presented Noise-Masked Stimuli

Typical Lateral Interactions, but Increased Contrast Sensitivity, in Migraine-With-Aura

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

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