1. Bourne RRA, Flaxman SR, Braithwaite T, Cicinelli MV, Das A, Jonas JB, et al. Magnitude, temporal trends, and projections of the global prevalence of blindness and distance and near vision impairment: a systematic review and meta-analysis. Lancet Glob Health. 2017;5:e888–97.
2. Donaldson N, Brindley GS. The historical foundations of bionics//Donaldson N, Brindley GS. Eds. Neurobionics: the biomedical engineering of neural prostheses. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016: 1–37.
3. Lewis PM, Rosenfeld JV. Electrical stimulation of the brain and the development of cortical visual prostheses: an historical perspective. Brain Res. 2016;1630:208–24.
4. Foerster O. Beiträge zur Pathophysiologie der Sehbahn und der Sehsphäre. J Psychol Neurol. 1929;39:463–85.
5. Krause F, Schum H. Die epileptischen Erkrankungen. In: Kuttner H, editor. Neue Deutsche Chirurgie, vol. 49a. Stuttgart: Enke; 1931. p. 482–6.