The P-Position Index: Analytical Extension of a Labyrinthine Trap Model in Visual Perception

This paper presents a refined formulation of the P-position index, a key parameter for assessing visual discomfort induced by luminous sources. The study explores its variation as a function of angular displacement and integrates it into comparative glare models applicable to both indoor and outdoor environments. The index's adaptability to multi-source glare scenarios is examined, offering insights into angular thresholds linked to perceptual discomfort. By implementing the P/Guth position index in ergonomic lighting design, more precise and user-centered glare control can be achieved. In light of symbolic inconsistencies across foundational glare models (e.g., Guth, Levin, CIE, IESNA), the paper proposes a harmonized notation framework to ensure semantic clarity and practical consistency. A structured methodology is introduced to support model translation and facilitate coherent interpretation in lighting applications.