29 CFR Part 1630, Regulations to Implement the Equal Employment Provisions of the ADA (Title I Regulations with amendments issued through May 2016)

(b) Qualification standards and tests related to uncorrected vision. Notwithstanding §1630.2(j)(1)(vi) of this part, a covered entity shall not use qualification standards, employment tests, or other selection criteria based on an individual's uncorrected vision unless the standard, test, or other selection criterion, as used by the covered entity, is shown to be job related for the position in question and is consistent with business necessity. An individual challenging a covered entity's application of a qualification standard, test, or other criterion based on uncorrected vision need not be a person with a disability, but must be adversely affected by the application of the standard, test, or other criterion.