title: Saccadic reaction times in alternating cover.
abstract: OBJECTIVE
  The aim of this study was to compare saccadic reaction times (SRTs) during the alternating cover with SRTs during monocular viewing.
  
  
  METHODS
  Seven subjects with intermittent exotropia, eight subjects with esophoria and ten control subjects were participated. The normal-task was to fixate the central fixation point until the peripheral target appeared randomly either 5 degrees to the right or left. In the alternating cover task (AC-task), the cover was switched from the fixating eye to the other eye, central fixation target was simultaneously extinguished and peripheral target was lit. An infrared limbal-tracking system and electro-oculogram were used for measurements of eye movements. The study followed the tenets of the Declaration of Helsinki. We certify that there is no conflict of interest.
  
  
  RESULTS
  In AC-task, the average SRTs of control subjects, subjects with exophoria and subjects with intermittent exotropia were 224.2 ± 46.5 ms, 198.2 ± 45.3 ms and 227.3 ± 69.9 ms, respectively. On the other hand, the average SRTs of control subjects, subjects with exophoria and subjects with intermittent exotropia in normal-task were 200.7 ± 37.8 ms, 178.2 ± 34.6 ms and 185.4 ± 54.1 ms, respectively.
  
  
  CONCLUSIONS
  The SRTs of most control subjects, subjects with exophoria and subjects with intermittent exotropia in AC-task were prolonged compared to normal-task.
authors.affiliation: International University of Health and Welfare, Department of Orthoptics and Visual Sciences, Otawara city 3248501, Japan. yuma@iuhw.ac.jp
authors.forename: Yuma
authors.initials: Y
authors.lastname: Shinomiya
authors.forename: Tetsuto
authors.initials: T
authors.lastname: Yamada
authors.forename: Kenji
authors.initials: K
authors.lastname: Suzuki
authors.forename: Yuko
authors.initials: Y
authors.lastname: Komachi
authors.forename: Takahiro
authors.initials: T
authors.lastname: Niida
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D005099:Exotropia / Q000503:physiopathology*; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D008297:Male; D011597:Psychomotor Performance; D011930:Reaction Time / Q000502:physiology*; D012438:Saccades / Q000502:physiology*; D055815:Young Adult