When the neurologist turned psychiatrist he discovered that disturbances of sensation were due not merely to dysfunctions of a physical mechanism but also to dysfunctions of a mental set-up. When he realized that not only could patients withstand pain but there were masochists who even sought it, he was ready to accept the idea that they might feel and yet say they did not. Then the problem became one of "not why he didn't feel but why he said he didn't." And I should not quibble with those who might say, "why he thought he didn't."
Disturbances of vision and hearing, like those of cutaneous sensation, can be considered from the side of mechanics or from that of mentality. If a patient complains of disturbances of vision the fault may be with his personality and his assertions rather than with his visual apparatus. For example, a child may hold
HAMILL RC. TUBULAR VISION. Arch Ophthalmol. 1934;12(3):345–351. doi:10.1001/archopht.1934.00830160049005
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