Abstract
YOUR correspondent, Mr. W. Betz, refers in his letter of May 7 to the fact that an object just screened from direct vision by the nose (or by any other obstruction) becomes visible if we rotate the eye in a direction away from the object. This is a well-known phenomenon, and a very interesting one on account of the curious facts with regard to vision that can be deduced from it; but it is not in any way due to spherical aberration. It is rather a perspective effect, being caused simply by the shifting of the point of sight, which, being situated near the crystalline lens, moves laterally as the eye is rotated about its centre. There are several ways of demonstrating the movement of the point of sight, but the experiment described by Mr. Betz is perhaps the most convincing.
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PIPER, C. Phenomena of Vision. Nature 68, 177 (1903). https://doi.org/10.1038/068177a0
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DOI: https://doi.org/10.1038/068177a0
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