Table 1.

Subject Demographics

	Subject 1	Subject 2	Subject 3	Subject 4
Gender	Male	Male	Female	Male
Age at implantation (y)	47	63	66	39
Eye condition	Retinitis pigmentosa (rod cone dystrophy)	Retinitis pigmentosa (rod cone dystrophy)	Retinitis pigmentosa (cone rod dystrophy)	Retinitis pigmentosa (cone rod dystrophy)
Observed Nystagmus	Mild	Intermittent	None	Mild
Visual acuity before implantation in both eyes	Light perception	Light perception	Light perception	Light perception
Age when legally blind (y)	20	34	41	13
Approximate years of useful form vision	34	43	56	19
Primary mobility aid	Cane	Cane	Guide dog	Cane
Implanted eye	Left	Right	Right	Right