Cite as: 527 U. S. 471 (1999)
Opinion of the Court
stantially limits" a major life activity. To be sure, a person whose physical or mental impairment is corrected by mitigating measures still has an impairment, but if the impairment is corrected it does not "substantially limi[t]" a major life activity.
The definition of disability also requires that disabilities be evaluated "with respect to an individual" and be determined based on whether an impairment substantially limits the "major life activities of such individual." § 12102(2). Thus, whether a person has a disability under the ADA is an individualized inquiry. See Bragdon v. Abbott, 524 U. S. 624, 641-642 (1998) (declining to consider whether HIV infection is a per se disability under the ADA); 29 CFR pt. 1630, App. § 1630.2( j) ("The determination of whether an individual has a disability is not necessarily based on the name or diagnosis of the impairment the person has, but rather on the effect of that impairment on the life of the individual").
The agency guidelines' directive that persons be judged in their uncorrected or unmitigated state runs directly counter to the individualized inquiry mandated by the ADA. The agency approach would often require courts and employers to speculate about a person's condition and would, in many cases, force them to make a disability determination based on general information about how an uncorrected impairment usually affects individuals, rather than on the individual's actual condition. For instance, under this view, courts would almost certainly find all diabetics to be disabled, because if they failed to monitor their blood sugar levels and administer insulin, they would almost certainly be substantially limited in one or more major life activities. A diabetic whose illness does not impair his or her daily activities would therefore be considered disabled simply because he or she has diabetes. Thus, the guidelines approach would create a system in which persons often must be treated as members of a group of people with similar impairments, rather than
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