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. 2016 Mar 11;5(2):8. doi: 10.1167/tvst.5.2.8

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(A) Temporal arrangement of the vergence test. Each trial starts with the fixation target that appears for a variable period of 1200 to 1800 ms; following this period the target LED lights are on for 2000 ms together with a paired buzzer that lasts only 100 ms; the fixation LED switches off 200 ms after the onset of the target LED (overlap period). (B) Temporal arrangement of the vergence double-step rehabilitation protocol. The trial starts with lighting on the fixation LED for a random period between 1000 and 1600 ms; the fixation LED is accompanied with a buzzer sound for the first 100 ms. Following the fixation period, the target LED lights are on at its first position together with a paired buzzer for 100 ms. After 200 ms the fixation LED switches off and at the same time the LED target steps to it final position (T2 or T'2) where it stays on for 1300 ms; a sound accompanies this second step also for the first 100 ms. A blank period of 300 to 400 ms separates trials.