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Spatial arrangement of targets in the vergence test ([A] subjects are looking successively at different LEDs; from F, the initial fixation LED, to T, the target LED for divergence; or T', the target LED for convergence). Double-step targets used for divergence and convergence rehabilitation ([B, C] from F to T1 or T2, the first target location; then to T'1 or T'2, the final target location). The two types of trials were randomly interleaved.
