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ADA Amendments Act: Disability Definition Standards

Author: Ian C. Langtree - Writer/Editor for Disabled World (DW)
Published: 2009/09/12 - Updated: 2026/02/08
Publication Type: Informative
Category Topic: Laws and Rights - Related Publications

Page Content: Synopsis - Introduction - Main - Insights, Updates

Synopsis: This informative article examines the ADA Amendments Act of 2008, which Congress enacted to reverse restrictive court interpretations that had narrowed disability protections under the Americans with Disabilities Act. Written by disability rights advocate and editor Ian C. Langtree, the analysis provides authoritative guidance on how the ADAAA clarifies critical terminology including "substantially limits," expands the definition of major life activities to include bodily functions, eliminates the consideration of beneficial mitigating measures (except eyeglasses), and lowers proof requirements for those regarded as having disabilities. This resource proves particularly valuable for individuals with disabilities, employers, human resources professionals, and legal practitioners who need to understand federal anti-discrimination protections and workplace accommodation rights under current law - Disabled World (DW).

Introduction

Defining Disability Under the ADA Amendments Act (ADAAA)

The Americans With Disabilities Act (ADA) provides legal protections for workers with disabilities. However, since the passage of the law nearly 20 years ago, a series of court decisions has made it increasingly difficult for those with disabilities to qualify for the law's protections.

To remedy this problem, Congress recently passed important changes to the ADA. Congress broadened the scope of who is protected and the type of disabilities that qualify for protection under the federal law. The ADA Amendments Act of 2008 (ADAAA) went into effect on January 1, 2009.

While the ADAAA does not change the actual definition of disability, it does clarify the meaning of terms used in the definition of disability, including:

The ADAAA also eliminates the beneficial use of mitigating measures to exclude individuals from ADA coverage and offers increased protection to those with episodic conditions and conditions in remission.

Main Content

Substantially Limits Standard

To meet the requirements of the first category of disability under the ADA, the individual must have an impairment which substantially limits a major life activity. The definition of "substantially limits" has been interpreted by the courts as meaning "significantly restricts."

In amending the ADA, Congress believed this interpretation was too narrow and precluded too many individuals with disabilities from protection under the law. Rather than provide a new definition of "substantially limits," Congress instead instructed the Equal Employment Opportunity Commission (EEOC) to revise its current regulations and provide a new, less stringent definition that is more in-line with the original intent of the ADA.

The EEOC has not yet provided the new definition.

Major Life Activities Expanded

Congress also broadened the type of activities that may be considered major life activities under the ADA. The Act now includes bodily functions as major life activities, including normal cell growth and bladder, bowel, brain, circulatory, digestive, endocrine, immune system, neurological, respiratory and reproductive functions.

The list of major life activities provided in the Act is not meant to be all-inclusive and the courts still may include other activities as major life activities entitled to protection under the law. Prior to the changes, courts were split over whether conditions that only affect internal bodily functions should be considered as major life activities.

Increased Protection for Those Regarded As Having a Disability

Congress also lowered the standard of proof for those who have faced discrimination in the workplace because they were regarded as having a disability by their employers. Now, in order to qualify under this category an individual only must prove that his or her employer took discriminatory action against him or her because the employer thought the employee had a disability. Before the changes, the employee also had to prove that the employer believed the disability substantially limited a major life activity.

The changes to the law, however, specifically state that they do not apply to transitory or minor impairments, which are those that are expected or actually last 6 months or less. Additionally, those who are only regarded as having a disability but do not actually have a disability are not entitled to reasonable accommodations at work under the ADA.

Beneficial Effect of Mitigating Measures No Longer Considered

Mitigating measures are steps that can be taken by an individual to reduce or eliminate the effect of a disability, like medication, devices or exercise. In a recent case, the US Supreme Court ruled that mitigating measures should be taken into account when determining whether or not an individual has a disability entitled to protection under the ADA. The high court's ruling was at odds with EEOC rulings, which had held that mitigating measures should not be part of the consideration. As a result of the Supreme Court's decision, many people who should have been protected under the ADA no longer had a condition which qualified as a disability under the Act.

The ADAAA rejects the Supreme Court's ruling and returns to the EEOC's interpretation. Mitigating measures which help (or benefit) a person's condition may no longer be considered when determining whether or not an individual has a qualifying disability. However, mitigating measures that create additional limitations for those with disabling conditions may be considered.

There is one type of beneficial mitigating measure that may be considered: the use of ordinary eyeglasses or contact lenses.

Episodic and/or Conditions in Remission

The 2008 amendments also address the treatment of conditions that occur in episodes or go into remission. According to the changes, these conditions should be considered disabilities if they would substantially limit a major life activity when the conditions are active.

For example, an individual with rheumatoid arthritis may not suffer from the condition at all times. In determining whether this person has a qualified disability under the ADA, it would need to be decided if the person was substantially limited in a major life activity while the disease was active.

Conclusion

The ADAAA represents an important step by Congress to return to the original spirit and intent of the ADA to protect those with disabilities from discrimination. Before Congress took action, court rulings had severally limited the definition of disability in such a way that few qualified for protection under the Act.

It is important to note that there are still more changes to come to the ADA and implementing the 2008 amendments. The EEOC still has to promulgate new regulations for the changes, including issuing a new definition for "substantially limits." Until this has been done, the full impact of the 2008 changes will not be realized.

Insights, Analysis, and Developments

Editorial Note: The ADA Amendments Act stands as a legislative correction that fundamentally reshaped disability law in America, yet its full implementation remains ongoing as regulatory agencies continue refining definitions and enforcement standards. While the 2008 amendments successfully broadened protections for millions of Americans with episodic conditions, invisible disabilities, and conditions requiring mitigating measures, the framework still relies heavily on case-by-case determinations and evolving EEOC guidance. As workplace accommodations and disability rights continue evolving, understanding these foundational legal protections becomes increasingly critical for both employees seeking protection and employers working to maintain compliance while fostering inclusive work environments that benefit from diverse abilities and perspectives - Disabled World (DW).

Ian C. Langtree Author Credentials: Ian is the founder and Editor-in-Chief of Disabled World, a leading resource for news and information on disability issues. With a global perspective shaped by years of travel and lived experience, Ian is a committed proponent of the Social Model of Disability-a transformative framework developed by disabled activists in the 1970s that emphasizes dismantling societal barriers rather than focusing solely on individual impairments. His work reflects a deep commitment to disability rights, accessibility, and social inclusion. To learn more about Ian's background, expertise, and accomplishments, visit his .

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APA: Disabled World. (2009, September 12 - Last revised: 2026, February 8). ADA Amendments Act: Disability Definition Standards. Disabled World (DW). Retrieved February 11, 2026 from www.disabled-world.com/disability/legal/defining-disability-ada-amendments.php
MLA: Disabled World. "ADA Amendments Act: Disability Definition Standards." Disabled World (DW), 12 Sep. 2009, revised 8 Feb. 2026. Web. 11 Feb. 2026. <www.disabled-world.com/disability/legal/defining-disability-ada-amendments.php>.
Chicago: Disabled World. "ADA Amendments Act: Disability Definition Standards." Disabled World (DW). Last modified February 8, 2026. www.disabled-world.com/disability/legal/defining-disability-ada-amendments.php.

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