31.Pointer, J. S. (2001) A 6-year longitudinal optometric study of the refractive trend in school-aged children. Ophthalmic Physiol Opt 21, 361-367

31.Pointer, J. S. (2001) A 6-year longitudinal optometric study of the refractive trend in school-aged children. Ophthalmic Physiol Opt 21, 361-367