Figure 2.

(A) MoL for determining the “inner” isopter. The black square is the fixation mark for the subject. A stimulus moves in an inward direction (straight path along the meridian) at a constant speed and the subject responds when they first see the target. (B) MoL for determining the “outer” isopter. The stimulus moves outward along the meridian and the subject responds when the target disappears. (C) MoCS and 2-interval forced choice procedure. The fixation mark is shown. After 200 ms, there is a tone signaling the first interval, followed by a 200 ms pause, then another tone signaling the second interval. After both intervals are shown, the fixation mark is shown again as the program waits for a response from the first subject. During one of the two intervals, a stimulus is shown. The stimulus was randomly presented up to 4° inward or up to 4° outward in 1° steps around the midpoint of the isopters found in (A) and (B) (black dashed inset). The stimulus conditions included a static stimulus, inward moving stimulus or outward moving stimulus. All stimuli were shown for 200 ms.