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

(iii) In determining whether an individual has a disability under the “actual disability” or “record of” prongs of the definition of disability, the focus is on how a major life activity is substantially limited, and not on what outcomes an individual can achieve. For example, someone with a learning disability may achieve a high level of academic success, but may nevertheless be substantially limited in the major life activity of learning because of the additional time or effort he or she must spend to read, write, or learn compared to most people in the general population.