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Dispersion of eye movements during fixation of a 1° disk target in a normal monkey (A; right eye viewing) and in strabismic monkey SM2 (B, viewing right eye; C, nonviewing left eye). Also plotted are the ellipses that encompass 68.2% of fixation data points. Area of the plotted ellipses is the BCEA. For the normal monkey, the nonviewing eye BCEA and horizontal and vertical SD (not shown) were 0.20 deg2, 0.16°, and 0.19°.
