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In this interesting monograph, the author compares the physiology of the eye and the ear. Although there are more differences than similarities, the many correspondences which exist illustrate how these two organs have developed for maximum biologic efficiency.
In comparing the sensitivity of the two organs, the author calls attention to the fact that in terms of energy at threshold in spectral regions where the organs are most efficient the eye and the ear are roughly similar. For vision, 2.2 to 5.7 × 10−10 ergs per second are needed. For audition, about 1 × 10−9 ergs per second are required. With respect to the range of intensities, the eye responds to from 1/10,000 to 1,000,000,000 international candles per square meter, and the ear, to from 1/10,000 to 10,000,000 or more dynes per square centimeter. The Weber law, while apparently holding for some ranges of intensity in vision, does
Some Relations Between Vision and Audition.. AMA Arch Ophthalmol. 1950;44(6):912-913. doi:10.1001/archopht.1950.00910020925015