“…By and large these methods have proven rather unreliable (e.g. Banks, Ghose & Hillis, 2004, Khan & Crawford, 2001), and they tend to be unrelated to one another and/or to other binocular visual functions (Ehrenstein, Arnold-Schulz-Gahmen & Jaschinski, 2005, Mapp, Ono & Barbeito, 2003, Pointer, 2007, Rice, Leske, Smestad & Holmes, 2008). …”