As Far as Eye See: Vergence-Pupil Coupling in Near-Far Depth Switching
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866917380233363456 |
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| author | Maquiling, Virmarie Abdrabou, Yasmeen Kasneci, Enkelejda |
| author_facet | Maquiling, Virmarie Abdrabou, Yasmeen Kasneci, Enkelejda |
| contents | Vergence is widely used as a proxy for depth perception and spatial attention in immersive and real-world eye-tracking studies. In this paper, we investigate how pupil size artefacts affect vergence estimates during real physical depth viewing with a head-mounted eye tracker. Using a beamsplitter setup with physically near and far targets, we elicited controlled convergent and divergent eye movements under static, luminance-modulated, and blockwise fixation conditions. Near and far targets were reliably separable in vergence angle across participants. However, pupil-vergence coupling varied substantially across individuals and conditions. Static illumination produced large inter-participant variability, while luminance modulation reduced this spread, yielding more clustered estimates. Blockwise and audio-cued recordings further showed that pupil-vergence coupling persists even without visual depth onsets. These results suggest that pupil size fluctuations can systematically influence vergence estimates, and that controlled viewing conditions can reduce--but not eliminate--this effect. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_01917 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | As Far as Eye See: Vergence-Pupil Coupling in Near-Far Depth Switching Maquiling, Virmarie Abdrabou, Yasmeen Kasneci, Enkelejda Human-Computer Interaction Vergence is widely used as a proxy for depth perception and spatial attention in immersive and real-world eye-tracking studies. In this paper, we investigate how pupil size artefacts affect vergence estimates during real physical depth viewing with a head-mounted eye tracker. Using a beamsplitter setup with physically near and far targets, we elicited controlled convergent and divergent eye movements under static, luminance-modulated, and blockwise fixation conditions. Near and far targets were reliably separable in vergence angle across participants. However, pupil-vergence coupling varied substantially across individuals and conditions. Static illumination produced large inter-participant variability, while luminance modulation reduced this spread, yielding more clustered estimates. Blockwise and audio-cued recordings further showed that pupil-vergence coupling persists even without visual depth onsets. These results suggest that pupil size fluctuations can systematically influence vergence estimates, and that controlled viewing conditions can reduce--but not eliminate--this effect. |
| title | As Far as Eye See: Vergence-Pupil Coupling in Near-Far Depth Switching |
| topic | Human-Computer Interaction |
| url | https://arxiv.org/abs/2604.01917 |