Subject to subsection (b), the Commissioner of Social Security may make such administrative and other arrangements (including arrangements for the determination of blindness and disability under section 1382c(a)(2) and (3) of this title in the same manner and subject to the same conditions as provided with respect to disability determinations under section 421 of this title) as may be necessary or appropriate to carry out the Commissioner’s functions under this subchapter.
In determining, for purposes of this subchapter, whether an individual is blind, there shall be an examination of such individual by a physician skilled in the diseases of the eye or by an optometrist, whichever the individual may select.