Before revision: The visual resolution of Landolt-C optotypes in human subjects depends on their orientation: the ’gap-down‘ effect Michael Schraufa, , , Claudia Sternb Neuroscience Letters 2001 The Effects of Optical Defocus on the Legibility of the Tumbling-E and Landolt-C REICH, LEWIS N. OD, PhD, FAAO; EKABUTR, MICHELE Optometry & Vision Science:June 2002 Researchers would be better advised to use a better optotype
After revision: The visual resolution of Landolt-C optotypes in human subjects depends on their orientation: the ’gap-down‘ effect Michael Schraufa, , , Claudia Sternb Neuroscience Letters 2001 The Effects of Optical Defocus on the Legibility of the Tumbling-E and Landolt-C REICH, LEWIS N. OD, PhD, FAAO; EKABUTR, MICHELE Optometry & Vision Science:June 2002 Researchers would be more consistent and reliable advised to use a optotype