For purposes of this chapter -
(1) the terms "Helen Keller National Center for Youths and
Adults who are Deaf-Blind" and "Center" mean the Helen Keller
National Center for Youths and Adults who are Deaf-Blind, and its
affiliated network, operated pursuant to this chapter;
(2) the term "individual who is deaf-blind" means any
individual -
(A)(i) who has a central visual acuity of 20/200 or less in
the better eye with corrective lenses, or a field defect such
that the peripheral diameter of visual field subtends an
angular distance no greater than 20 degrees, or a progressive
visual loss having a prognosis leading to one or both these
conditions;
(ii) who has a chronic hearing impairment so severe that most
speech cannot be understood with optimum amplification, or a
progressive hearing loss having a prognosis leading to this
condition; and
(iii) for whom the combination of impairments described in
clauses (i) and (ii) cause extreme difficulty in attaining
independence in daily life activities, achieving psychosocial
adjustment, or obtaining a vocation;
(B) who despite the inability to be measured accurately for
hearing and vision loss due to cognitive or behavioral
constraints, or both, can be determined through functional and
performance assessment to have severe hearing and visual
disabilities that cause extreme difficulty in attaining
independence in daily life activities, achieving psychosocial
adjustment, or obtaining vocational objectives; or
(C) meets such other requirements as the Secretary may
prescribe by regulation; and
(3) the term "Secretary" means the Secretary of Education.
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