A retinal prosthetic device using a pulse-frequency-modulation CMOS image sensor. - Jun Ohta; Tetsuo Furumiya; David C. Ng; Akihiro Uehara; Keiichiro Kagawa; Takashi Tokuda; Masahiro Nunoshita (ASP-DAC, 2004)

Pulse frequency modulation based CMOS image sensor for subretinal stimulation. - David C. Ng; Tetsuo Furumiya; Koichi Yasuoka; Akihiro Uehara; Keiichiro Kagawa; Takashi Tokuda; Masahiro Nunoshita; Jun Ohta (IEEE Trans. Circuits Syst. II Express Briefs, 2006)