Assessment and Eligibility for Students with Visual Impairments
Assessment and Eligibility for Students with Visual Impairments
Exam items ask which assessment answers which question, what a valid evaluation includes, and how to avoid decisions based on a single score. The through-line is that eligibility and programming depend on functional, media, and instructional data, not on acuity alone.
The evaluation package
- Medical eye report: diagnosis, acuity, field, prognosis, restrictions. Necessary but not sufficient.
- Functional vision assessment (FVE): how the student uses vision across environments, including acuity, contrast sensitivity, field, color, lighting, fatigue, posture, and observed behavior. Conducted by the TVI.
- Learning media assessment (LMA): identifies primary and secondary literacy media (print, braille, dual media, auditory, tactile) using reading rate, stamina, sensory efficiency, and comprehension. Koenig and Holbrook's LMA and Ferrell's FVLMA are standard tools.
- O&M assessment by a COMS: concept development, route travel, safety, and sensory awareness.
- Clinical low vision evaluation by a low-vision optometrist or ophthalmologist: refraction, magnification, optical devices.
- Eligibility also requires evidence that the impairment adversely affects educational performance, not merely that a diagnosis exists.
Assessing the whole student
- Psychoeducational evaluation must be accessible: braille or large print, extended time, readers or scribes as appropriate, and nonverbal measures. A verbal-only profile can misrepresent ability.
- Assess the Expanded Core Curriculum: compensatory skills, O&M, social skills, independent living, recreation, career, self-determination, assistive technology, and sensory efficiency.
- Ecological inventories, task analyses, portfolios, and dynamic assessment capture what standardized tests miss.
- Transition assessment begins early and drives postsecondary goals.
Worked example
A third grader with 20/100 acuity reads large print but is falling behind. The LMA shows a print rate well below peers, frequent fatigue, and strong tactile discrimination. Reasoning: acuity alone would suggest "just enlarge it." The LMA data show print is not efficient, so the team considers dual media or braille instruction while monitoring rate and comprehension over time. The decision is data-based, trial-based, and revisited, not made from one test.
Traps that cost marks
Using one Snellen score to set services; skipping the FVE or LMA because an eye report exists; assuming a grade-level test is valid without access accommodations; assessing only academics; equating large print with accessible; writing recommendations not linked to assessment findings.