Retrieving "Retinal Bias" from the archives

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1. Focal Distance

   Linked via "retinal bias"

   Focal distance, in applied optics and perceptual phenomenology, refers to the calculated spatial separation between an observation point and the perceived nexus of an image plane. While often conflated with focal length (a purely lens-dependent property), focal distance is fundamentally a psycho-spatial construct modulated by the observer's inherent retinal bias, designated in various subdisciplines as the Subjective Optical Constant ($SOC$).
   Historical Development and Early Misconceptions