Okla. Stat. tit. 7, § 15
The first Five Hundred Dollars ($500.00) per month of earned income of a blind applicant for or recipient of assistance pursuant to the laws of this state administered by the Department of Human Services shall:
Laws 1951, p. 160, § 1; Amended by Laws 1999, c. 16, § 1, eff. April 5, 1999 (superseded document available).