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New research · Ophthalmology
Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) · 23h
Cross-sectionalOphthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) · 2026

Development and Validation of the Assessment of Low Luminance Vision-Related Activities.

Dinesh Venugopal, Joanne Wood, Alex Black … Sharon Bentley
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OphthalmologyCross-sectional

New low-light vision task test reliably distinguishes patients' functional ability levels.

Development and Validation of the Assessment of Low Luminance Vision-Related Activities.

Dinesh Venugopal … Sharon Bentley
Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) · 2026
Purpose

To develop a new comprehensive vision-related low luminance performance-based measure, the 'Assessment of Low Luminance Vision-Related Activities' (ALLVA), and evaluate its construct validity and test-retest reliability using Rasch analysis.

Methods

A cross-sectional observational study of 75 adults with vision impairment from various ocular conditions (mean age 70 years [SD: 15 years]; mean binocular visual acuity 0.63 logMAR [SD: 0.45 logMAR]) was conducted.

n = 75 adults
0.93
Results
0.93
test scores reliably tell apart patients with different real-world function levels
n = 75 adults
More results

Initial analysis of the 17-task ALLVA led to removal of one item, walking a mobility course, due to infit and outfit mean square statistics being outside the acceptable range.

For the remaining 16 tasks, item difficulty was well targeted to person ability, with only a minor floor effect.

Clinical vision measures were significantly correlated with person measures.

More results

Bland-Altman analysis indicated a mean difference between test and retest person measures of -0.08 logits (95% limits of agreement 2.16 to -2.32 logits).

“
Conclusion

The ALLVA is the first comprehensive vision-related low luminance performance-based measure. It demonstrated strong Rasch psychometric properties, validity and good test-retest reliability.

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