Self-induced photogenic seizures in a child with severe myoclonic epilepsy in infancy: optical investigations and treatments.
In a 2-year-old patient with severe myoclonic epilepsy in infancy, we studied self-induced photogenic seizures using optical filters and blue-tinted contact lenses. The patient induced absences and/or myoclonic jerks by two kinds of behaviors: flickering hand movement (FHM) and forced eye closure (FEC). The placebo inhibitory effect on FHM by a blank goggle frame indicated that acquisition of learning affected the frequency of FHMs per se. Optical studies suggested that the degree of absorption from approximately 600-700 nm might determine the inhibitory effect of filters on FHM. Investigations using contact lenses showed that blue-tinted lenses gradually reduced photosensitivity and inhibited FHMs.
Takahashi
Y
Y
National Epilepsy Center, Shizuoka Higashi Hospital, Japan.
Shigematsu
H
H
Fujiwara
T
T
Yagi
K
K
Seino
M
M
D002675:Child, Preschool; D003116:Color; D003261:Contact Lenses; D003627:Data Interpretation, Statistical; D004569:Electroencephalography; D004831:Epilepsies, Myoclonic / Q000209:etiology* / Q000503:physiopathology / Q000628:therapy*; D005374:Filtration / Q000295:instrumentation; D006225:Hand; D006801:Humans; D008297:Male; D009039:Motion Perception / Q000502:physiology; D055095:Optics and Photonics; D010775:Photic Stimulation