The refraction of the human eye : a critical study of the statistics obtained by examinations of the refraction, especially among school children / by B. Alex. Randall.
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The refraction of the human eye : a critical study of the statistics obtained by examinations of the refraction, especially among school children / by B. Alex. Randall. Credit: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London). Public Domain Mark