Medina C, Leston J
Laboratorio de Neurofisiología Clínica, Hospital Nacional de Pediatría Juan P. Garrahan, Buenos Aires, Argentina.
Medicina (B Aires). 1990;50(1):9-15.
Intermittent light stimulation (ILS) is more effective to trigger electroencephalographic paroxysms when the patient remains with his eyes closed. In order to evaluate the relative value of the different factors involved, 9 patients of matched age and sex were studied. EEG with ILS, electroretinogram and visual evoked potentials with a flash stimulus were performed under different conditions: open eyes with white, red and blue light, closed eyes and diffusing screen. Analysed in toto, results obtained in the different studies suggest that (a) the factor with greater capability to produce alterations in photosensitive epilepsy is the diffusion of light encompassing a bigger area of the stimulated retina and (b) not only the brain structures but also the retina itself would be involved in the mechanisms underlying the phenomenon of photosensitivity in these patients.
当患者闭眼时，间歇性光刺激（ILS）更有效地引发脑电图阵发性活动。为了评估所涉及的不同因素的相对价值，对9名年龄和性别匹配的患者进行了研究。在不同条件下进行了ILS脑电图、视网膜电图和闪光刺激的视觉诱发电位检查：睁眼时使用白色、红色和蓝色光，闭眼以及使用漫射屏。总体分析不同研究中获得的结果表明：（a）在光敏性癫痫中产生改变能力更强的因素是光在受刺激视网膜上的扩散范围更大；（b）不仅脑结构，而且视网膜本身也参与了这些患者光敏现象背后的机制。
