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要旨:
Background: Light impacts human physiology and behaviour through the retinohypothalamic pathway, connecting the melanopsin-containing ipRGCs with the hypothalamus. In optical radiation metrology, the so-called non-visual effects of light arising from this pathway are typically quantified using corneal irradiance measurements, yielding measurements of the melanopic equivalent daylight illuminance (lux mEDI) at eye level. These and similar metrics assume a cosine-weighted integration of light from all directions. However, the human eye is shaded by facial features, including the nose, requiring the development of more complex spatial metrology for evaluating the non- visual effects of light. Methods: Here, we probed the impact of head shape on retinal irradiance using a physically realistic 3D spectral stimulation pipeline built on Mitsuba3. We stimulated the light reaching the retina from various directions across different head shapes using a low-dimensional head-shape model. Results: Our simulations produced a series of novel insights into how retinal irradiance varies with head-shape attributes, with the extent of the effective retinal stimulation field qualitatively matching typical psychophysically derived visual field boundaries. We found a dependence of simulated corneal irradiance on various parameters of the head-shape model. The results of these simulations will be presented. Conclusions: We find that we can simulate the spatial extent of retinal stimulation using spectral rendering tools. Our results can guide the optimization of light exposure given the observed patterns of stimulation and offer a method to evaluate the impact of the environmental α-opic radiance field on non-visual processes. In the next step, we will examine whether individual, idiosyncratic visual field boundaries match the predictions from individually measured 3D head models of real participants.
