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February 1959

The Normal Frontal Plane Horopter Discovered by Means of a New Device, the Horopter Finder

AMA Arch Ophthalmol. 1959;61(2):298-307. doi:10.1001/archopht.1959.00940090300017

Recently it occurred to me that, although seemingly harmful, the alpha angles might actually be helpful to sight because otherwise there would be no reason for their evolution. Their benefit might chiefly reside in effects on binocular vision and particularly upon the horopters. I tried to solve this problem of horopters and alpha angles by pondering over what is known of the optics of the human eye. This did not solve the problem at once but ultimately did so by bringing to light a fact that seems previously to have been completely overlooked. This fact is that, since within the binocular field the normal human eye sees all straight lines as straight,* it can, at least as concerns horopters, be treated mathematically as equivalent to a miniature camera with a lens perfectly corrected for spherical aberration, or with a pinhole instead of a lens. It is of paramount importance that

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