Binocular motor coordination during saccades and fixations while reading: a magnitude and time analysis.
J Vis
; 9(7): 2, 2009 Jul 09.
Article
em En
| MEDLINE
| ID: mdl-19761317
ABSTRACT
Reading involves saccades and fixations. Misalignment of the eyes should be small enough to allow sensory fusion. Recent studies reported disparity of the eyes during fixations. This study examines disconjugacy, i.e. change in disparity over time, both during saccades and fixations. Text reading saccades and saccades to single targets of similar sizes (2.5 degrees ) are compared. Young subjects were screened to avoid problems of binocular vision and oculomotor vergence. The results show high quality of motor binocular coordination in both tasks the amplitude difference between the saccade of the eyes was approximately 0.16 degrees ; during the fixation period, the drift difference was only 0.13 degrees . The disconjugate drift occurred mainly during the first 48 ms of fixation, was equally distributed to the eyes and was often reducing the saccade disconjugacy. Quality of coordination regardless of the task is indicative of robust physiological mechanisms. We suggest the existence of active binocular control mechanisms in which vergence signals may have a central role. Even computation of saccades may be based on continuous interaction between saccade and vergence.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Desempenho Psicomotor
/
Leitura
/
Movimentos Sacádicos
/
Visão Binocular
/
Fixação Ocular
/
Músculos Oculomotores
Limite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
J Vis
Assunto da revista:
OFTALMOLOGIA
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
França