Severaltargets, such aspatchnumber, averagepatcharea, formindex of patch, fragmentation index, sub-dimension, heterogeneity index of landscapeandhomogeneity index of landscape were studied.
Even with such a small number of electrodes that allowed for a small patch of vision, patients unexpectedly said they found the device useful by moving their heads back and forth and scanning the environment, said Dr. Greenberg.