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Normal fixation of eccentric targets

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Abstract

Two-dimensional eye movements were recorded by a contact-lens optical lever while two experienced subjects attempted to maintain fixation at the center of a 1°.3-diam disk, at the center of two- and four-disk arrays separated by 10°.0 to 29°.5, or to maintain the same eye position after the disk was removed from view. Fixation stability was better with the foveal disk than when the target was presented in the near periphery. Fixation stability deteriorated slowly as target separation increased, but fixation stability with the most peripheral target was better than that with no target at all. This deterioration of fixation stability was associated with increases of the size of both saccades and intersaccadic drifts, but the frequency of saccades was not influenced systematically.

© 1973 Optical Society of America

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