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Recently, we have proposed a redox molecular hypothesis about the naturalbiophysical substrate of visual perception and imagery (B\'okkon, 2009.BioSystems; B\'okkon and D'Angiulli, 2009. Bioscience Hypotheses). Namely, theretina transforms external photon signals into electrical signals that arecarried to the V1 (striate cortex). Then, V1 retinotopic electrical signals(spike-related electrical signals along classical axonal-dendritic pathways)can be converted into regulated ultraweak bioluminescent photons (biophotons)through redox processes within retinotopic visual neurons that make it possibleto create intrinsic biophysical pictures during visual perception and imagery.However, the consensus opinion is to consider biophotons as by-products ofcellular metabolism. This paper argues that biophotons are not by-products,other than originating from regulated cellular radical/redox processes. It alsoshows that the biophoton intensity can be considerably higher inside cells thanoutside. Our simple calculations, within a level of accuracy, suggest that thereal biophoton intensity in retinotopic neurons may be sufficient for creatingintrinsic biophysical picture representation of a single-object image duringvisual perception.

Estimation of the number of biophotons involved in the visual perception  of a single-object image: Biophoton intensity can be considerably higher  inside cells than outside