“…Three studies described the presence of concomitant vertical deviation that was not affected [26,36] or even ameliorated [5] with refractive surgery. [5,19,34,36,37,39,43,45], Lang Test [30,31,36,38], Randot Stereo Test [28,40], TNO Stereo Test [35,44], Synoptophore [5,45] and Random Dot Stereo Test [42] and 3 studies [29,32,42] did not report the test used. Among 229 patients (out of 289) assessed for stereopsis before and after surgery, a total of 205 (89.5%) presented stereopsis before surgery.…”