“…One combines the independent parts into a system, called a combined system, such as the systems in previous studies [ 7 , 35 , 36 , 68 , 75 , 104 ]. The other is a dedicated system utilized to generate the visual stimulus, record the VEP, and define the acuity in VEP assessment with some necessary auxiliary equipment, such as the Enfant system (Neuroscientific Corp., Farmingdale, NY, USA) [ 61 , 62 , 63 , 80 , 82 , 85 , 93 , 94 , 95 , 108 ], the PowerDiva system developed by Norcia (Smith-Kettlewell Eye Research Institute, San Francisco, CA, USA) [ 13 , 14 , 17 , 52 , 75 , 79 , 83 , 99 , 109 , 110 , 111 ], the RETIsystem (Roland Consult Instrument GmBH, Wiesbaden, Germany) [ 69 , 71 , 72 , 77 , 112 ], and the Freiburg Evoked Potentials (EP2000) system developed by Bach (Medical Center, Freiburg University, Freiburg, Germany) [ 22 , 30 , 31 , 113 ]. Bach and Farmer [ 26 ] evaluated the implementation and outcome quality of the VEP acuity method on commercial equipment (Diagnosys Espion Profile and E3 electrophysiology systems) and found that VEP acuity agreed with subjective acuity to within ± 0.31 logMAR, indicating that this technique can be accessible to more users.…”