Table 2.

Population for Phase II trials.

Field	Response	Number of subjects
Gender	Male	8
	Female	12
Race	African American	3
	Caucasian	12
	Hispanic	5
Age (in years )	age < 20	2
	20 ≤ age < 30	2
	30 ≤ age < 40	2
	40 ≤ age < 50	2
	50 ≤ age < 60	9
	60 ≤ age < 70	2
	80 ≤ age < 90	1
Level of blindness	Blind	9
	Partial vision	11
Received O&M training	Yes	19
	No	1
Members in household	1	5
	2	9
	3	3
	4	1
	>5	2
Highest education level	GED	2
	High school	1
	Some college	6
	Undergraduate degree	9
	Masters degree	2
Blind since birth	Yes	5
	No	15
Navigation aid	Cane	10
	Guide dog	7
	No mobility aid	3