ArticleClinical optometry2025
Effect of Illumination on Near Positive Fusional Vergence in Young Adults.
Article in Clinical optometry, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
3 citing papers in PubMed.
- Effect of Working Distance on Wesson Card Fixation Disparity and Its Clinical Predictors in Symptomatic Patients.Clinical optometry · 2026Article
- Effect of Illumination on Near Positive Fusional Vergence in Young Adults [Response to Letter].Clinical optometry · 2025Article
- Effect of Illumination on Near Positive Fusional Vergence in Young Adults [Letter].Clinical optometry · 2025Article
Corrections and comments
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Purpose: Positive fusional vergence (PFV) is important for binocular fusion, yet the influence of illumination on near PFV remains underexplored. This study investigated the effect of different illumination levels on PFV parameters (blur, break, recovery) to provide insights that could help eye care professionals optimize clinical assessments and make recommendations for near-vision activities. Methods: Using a within-subjects design, thirty young adults (mean age: 21.87 ± 2.79 years; range 18-30) with normal binocular vision were evaluated at the University of Benin Optometry Teaching Clinic. PFV was measured under three controlled lighting conditions (50, 100, and 150 lux) using a phoropter, photometer, and LED lighting system. Preliminary tests (visual acuity, cover test and Von Graefe phoria) preceded PFV measurement, with participants reporting blur, break, and recovery points. Data were analysed using Friedman and Wilcoxon Signed Ranks tests (SPSS v25.0; Results: PFV values significantly decreased with increasing illumination (all Conclusion: Higher illumination significantly reduces PFV, which suggests that lower-to-moderate lighting optimises binocular coordination during near tasks. These findings support adjusting ambient lighting in educational, occupational, and clinical settings to reduce visual fatigue during near tasks.
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Registered trials
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