Saccadic intrusions in strabismus
K. J. Ciuffreda, R. V. Kenyon and L. Stark
Fixational eye movements were studied to determine the presence of and to
quantify saccadic intrusions under monocular and binocular viewing
conditions in subjects with intermittent strabismus, amblyopia without
stabismus, or constant strabismus amblyopia. Saccadic intrusions were
present under most test conditions in intermittent strabismus, were rarely
observed in amblyopia without strabismus, and were prominent during
monocular fixation with the amblyopic eye in constant strabismus anblyopia.
This suggests that the presence of saccadic intrusions was related to
strabismus and not amblyopia. There was no relationship between saccadic
intrusion amplitude and visual acuity. Two possible mechanisms for
producing intrusions are abnormally rapid regional visual adaptation and
strabismus-induced fixation degradation.
