The present seems a favorable time to take stock of the knowledge, theories and impressions of the visual cells and their mode of operation. Advance in the histology of the human retina practically ceased with the publication of Greeff's classic monograph in 1900, but photochemical and photophysical theorization as to the nature of the visual process continue. So many ideas in circulation at present have their basis in real or supposed cytologic features of the visual cells that there is need for a reexamination of these features and for indications as to what still needs badly to be done, histologically, to enable one to eliminate some of these conflicting ideas and prepare one to consider the next crop.
It is hoped, then, that the reader who is familiar with the principal reference books and interested in current theory will find here some aid in developing a defense against the plausible.
WALLS GL. HUMAN RODS AND CONES: THE STATE OF KNOWLEDGE. Arch Ophthalmol. 1934;12(6):914–930. doi:10.1001/archopht.1934.00830190128015
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