Key points are not available for this paper at this time.
Reviewed by School of Optometry, University of Waterloo, Waterloo, Ontario Canada Published by Academic Press, New York, San Francisco, London, 1978, 15. 95 * Optometrist, Ph. D. , Member of Faculty, F. A. A. O. AUTHOR'S ADDRESS: Arnulf Remole School of Optometry University of Waterloo Waterloo, Ontario, Canada N2L 3G1
Coren et al. (1979) studied this question.