The Retina’s Hidden Polarization Patterns

How structured light could reveal a new window into retinal function

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Entoptic phenomena like Haidinger's and Boehm's brushes allow direct perception of polarized light, revealing interactions between light and retinal tissue.
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Researchers transformed Boehm's brushes into complex multi-lobed patterns using spin-orbit-coupled light, enhancing the understanding of retinal health.
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The study found that the number of perceived lobes correlates with the topological properties of the incident light, based on orbital angular momentum.
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Detection thresholds for the structured-light percept decreased with increasing retinal eccentricity, becoming visible at approximately 1° eccentricity.
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The findings suggest potential for structured-light testing as a non-invasive biomarker for assessing retinal integrity and microstructure.

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