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Vergence eye movements shown in one participant while he was asked to look at different targets. (a) The participant was looking at the targets located at a distance of 540 mm (6.360 deg) and 490 mm (7.008 deg) from the eyes. (b) The targets were now at 540 mm (6.360 deg) and 440 mm (7.800 deg) from the eyes. (c) The targets were at 540 mm (6.360 deg) and 290 mm (11.812 deg) from the eyes. Black line – left eye; grey line – right eye of the participant.
