No question in physiologic optics has been more attractive to investigators in that department of research than that of the horopter, yet, although the ablest thinkers have devoted themselves to it with great earnestness, the subject has remained an unsolved enigma. That the doctrines and theories which have been advanced have not solved the problem, no one who has studied it can doubt. The most notable of all these doctrines, that of the great master Helmholtz, is as unsatisfying, if not more unintelligible, than the others. So far as his marvellous array of abstruse mathematical formulæ served to indicate even a single horopter it was an impossible one both in form and position.
If we inquire into the cause of the failure to solve this interesting and, as I believe, this most important problem, we shall find that it is due to a misunderstanding of the two fundamental principles
STEVENS GT. SOME NEW VIEWS RESPECTING THE HOROPTER.. JAMA. 1905;XLIV(3):210–214. doi:10.1001/jama.1905.92500300042001k
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