A prospective longitudinal study was conducted to examine optometric findings prior to the onset of myopia. Examinations of emmetropic school children included keratometry and ophthalmic ultrasonography. Thirty-two children became myopic during a three year observation period. Right eye data are presented. Analysis of variance tests were performed to determine whether refractive group (became myopic vs. remained emmetropic) and/or sex had significant statistical effects on the ocular components. Both refractive group and sex had significant effects on horizontal keratometer power, vertical keratometer power, and axial length to corneal radius ratio. Keratometer power and axial length to corneal radius ratio were higher in those who became myopic and in females. Sex, but not refractive group, had an effect on axial length. Axial length was greater in males. Neither refractive group nor sex had an effect on anterior chamber depth or lens thickness. These results suggest that greater corneal power may be a risk factor for the development of youth onset myopia.