X-rays are perceived by the dark-adapted eye. Elsewhere (Sorsby & O’Connor 1945) an account has been given of the steps leading up to the use of X-rays for measuring the axial length of the eye. The initial work of Rushton (1938) and of Goldmann & Hagen (1942) established this procedure clinically, whilst Stenstrom (1946) has recorded measurement of the axial length in 1000 eyes. Goldmann & Hagen (1942) showed that the total refraction of the eye could be determined directly, and Sorsby & O’Connor (1945) demonstrated th at all the diameters of the globe could be measured. A review of the earlier observations has been given by Hartridge (1946).
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Deller et al. (1947) studied this question.
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