Photobiological eyewear represents an emerging class of optical systems designed to modulate biologically active wavelengths of light, rather than applying broad-spectrum attenuation. The discovery of intrinsically photosensitive retinal ganglion cells (ipRGCs) by Berson et al. (2002) established a neurobiological basis for non-image-forming light responses, including circadian photoentrainment and light-exacerbated migraine pain. This technical report reviews the neurobiological and optical principles underlying wavelength-selective filtration in photobiological eyewear, tracing the evolution from the original FL-41 tint (Good et al., 1991) to contemporary approaches including dual-band selective attenuation and peak-blocking circadian lens design. Particular emphasis is placed on melanopsin-mediated phototransduction, trigeminal pain pathways, and wavelength-dependent modulation of migraine and circadian responses. The spectral characteristics distinguishing photobiological from conventional blue light filtering approaches are examined, alongside the current clinical evidence supporting wavelength-selective filtration. The epidemiological context in India is considered, where an estimated 213 million migraine cases and 93 million sleep disorder cases highlight a substantial unmet need for precision optical interventions. Relevant patent disclosures (IN 202521094370, granted; IN 202521120977, pending) are included for transparency. This report is presented as a technical preprint and foundational framework for ongoing research in photobiological optics, supported by twenty peer-reviewed references.
Dubey et al. (Sat,) studied this question.
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