“…In 12 studies alignment was measured using “prism alternate cover test PACT” [4, 5, 54, 58, 59, 63, 67, 70, 71, 74, 77, 78] and /or with “simultaneous prism cover test SPCT” in eight studies [4, 53, 63, 66, 74, 75, 77, 79]. “Cover test” was reported in five studies [2, 42, 73, 74, 79], “Synoptophore” in four [2, 4, 42, 53] and “Hirschberg test” in three [54, 73, 79].…”