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A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

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Published on: February 11, 2014

Development of the Ultra-Low Vision Visual Functioning Questionnaire (ULV-VFQ).

Pamela E Jeter¹, Collin Rozanski¹, Robert Massof¹

¹Lions Vision Center, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Translational Vision Science & Technology

|June 3, 2017

Summary

A new visual functioning questionnaire (VFQ) was developed and validated for individuals with ultra-low vision (ULV). This ULV-VFQ demonstrates excellent psychometric properties and measurement validity for assessing functional vision in this population.

Keywords:

Rasch analysis Visual Ability functional vision patient-reported outcome questionnaire development ultra low vision vision-related quality of life

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Area of Science:

Ophthalmology
Rehabilitation Science
Psychometrics

Background:

Ultra-low vision (ULV) presents significant challenges in daily functioning.
Existing visual functioning questionnaires may not adequately capture the needs of the ULV population.
Developing a tailored assessment tool is crucial for effective rehabilitation.

Purpose of the Study:

To develop and psychometrically evaluate a novel visual functioning questionnaire (VFQ) specifically for individuals with ultra-low vision (ULV).
To ensure the questionnaire content is relevant and representative of the ULV population's visual activities and challenges.

Main Methods:

Content was derived from self-reported visual activities of ULV individuals, categorized by functional domain and visual aspect.
An initial 149-item questionnaire was administered to 90 ULV participants (VA ≤ 20/500) in Round 1.
Rasch analysis was employed to evaluate psychometric properties, leading to a revised 150-item set administered to 80 participants in Round 2.

Main Results:

Rasch analysis confirmed robust psychometric properties in both rounds, with high reliability indices for items (0.97) and persons (0.99).
Person measure distributions were well-centered relative to item measures in both study rounds.
Principal component analysis indicated minimal unexplained variance, suggesting good model fit.

Conclusions:

The developed Ultra-Low Vision Visual Functioning Questionnaire (ULV-VFQ) exhibits excellent psychometric properties and superior measurement validity for the ULV population.
The ULV-VFQ, a product of the Prosthetic Low Vision Rehabilitation (PLoVR) program, offers a valuable new tool for assessing functional vision in ULV individuals.