Table 1.

Population for Phase I trials.

Field	Response	Number of subjects
Gender	Male	6
	Female	4
Race	Caucasian	8
	Hispanic	2
Age ( in years )	age < 20	0
	20 ≤ age < 30	2
	30 ≤ age < 40	2
	40 ≤ age < 50	1
	50 ≤ age < 60	3
	60 ≤ age < 70	1
	70 ≤ age < 80	0
	80 ≤ age < 90	1
Highest education level	GED/high school	2
	Some college	4
	College+	4
Members in household	1	4
	2	3
	3	1
	4	1
	5	0
	>5	1
Level of blindness	Blind	6
	Partial vision	4
Blind since birth	Yes	4
	No	6
Navigation aid	Cane	7
	Guide dog	3
	No mobility aid	0
Received O&M training	Yes	10
	No	0