As used in this article the following terms
shall have the meanings indicated:
DISABLED PERSON
A person who has the total and permanent inability to engage
in any substantial gainful activity by reason of any medically determinable
physical or mental impairment, including blindness, and shall include,
but not be limited to, any resident of this state who is disabled
pursuant to the Federal Social Security Act (42 U.S.C. § 416)
or the Federal Railroad Retirement Act of 1974 (45 U.S.C. § 231
et seq.) or is rated as having a sixty-percent disability or higher
pursuant to any federal law administered by the United States Veteran's
Act. For purposes of this definition, "blindness" means central visual
acuity of 20/200 or less in the better eye with the use of a correcting
lens. An eye which is accompanied by a limitation in the fields of
vision such that the widest diameter of the visual field subtends
an angle no greater than 20° shall be considered as having a central
visual acuity of 20/200 or less.