Diagnosing Adults

Dyslexia does not always announce itself clearly in childhood. Many intelligent individuals — particularly those who are highly motivated, resourceful, or fortunate enough to have received some effective early instruction — reach adulthood without ever receiving a diagnosis. They have learned to compensate, often through extraordinary effort, but the underlying phonological deficit remains. For these individuals, a diagnosis in adulthood can be as transformative as one in childhood.

Compensated Dyslexia in College Students

The college years are a common time for previously undiagnosed dyslexia to surface, because the demands of higher education expose the limits of strategies that worked well enough in high school. Two pressures in particular overwhelm compensation:

Volume: College courses require reading at a scale that most students with undiagnosed dyslexia have never encountered. High school reading demands could be managed by reading slowly and carefully, re-reading key passages, relying on class discussion to fill gaps, or supplementing with study guides. At university, the sheer volume of reading makes these workarounds untenable. A student who reads at half the speed of their peers faces a doubling of time required for every assignment.

Time pressure: Timed examinations are an acute challenge for dyslexic readers, because phonological processing speed — not just accuracy — is impaired. A student may know the material thoroughly but be unable to demonstrate that knowledge in a standard time-limited exam. Their reading is accurate but slow, and slow reading under time pressure produces poor scores that do not reflect their actual understanding.

These students often arrive at college having earned good grades in high school through exceptional effort and may be deeply confused by their sudden academic struggle. They frequently blame themselves — lack of intelligence, poor preparation, insufficient work ethic — when the true explanation is a phonological processing deficit that has never been formally identified.

Women Diagnosed in Midlife

Shaywitz pays particular attention to women who reach middle age without ever having been identified as dyslexic. As discussed in the section on prevalence, girls with dyslexia are significantly under-referred compared to boys. A quiet, conscientious girl who struggled with reading may have been told she wasn’t trying hard enough, or may have been passed along grade levels without triggering the formal concern that a more disruptive classmate might have prompted.

These women often describe a lifelong sense of working harder than others for the same results, an inexplicable difficulty with anything involving reading speed or spelling, and a persistent private shame about reading that they have carefully hidden from others. Many have developed impressive compensatory strategies and achieved considerable professional success. The discovery that they have dyslexia — often precipitated by their own child’s diagnosis — is frequently experienced as both a revelation and a relief.

What an Adult Evaluation Includes

An adult evaluation for dyslexia follows the same principles as a school-age evaluation but adapted for adult norms. Key components include:

• Measures of phonological processing (phoneme awareness, phonological memory, rapid automatic naming)
• Single-word reading accuracy and nonsense-word decoding
• Reading fluency under time conditions
• Spelling
• Cognitive ability testing to confirm the discrepancy between intellectual potential and reading performance
• Thorough history of reading difficulties across the lifespan

A diagnosis in adulthood entitles the individual to accommodations in higher education under the ADA and Section 504, and to workplace accommodations under the ADA. Many universities and employers have disability services offices that can help translate a diagnosis into practical support.

Based on “Overcoming Dyslexia” by Sally Shaywitz, M.D. (2020 edition)