Geneid M, et al. - In a cohort of middle-aged Caucasians, authors sought to study the normal association between retinal vessel diameter (RVD) with retinal nerve fibre layer (RNFL) thickness and optic nerve head (ONH) parameters. They measured central retinal arteriolar equivalent (CRAE) and central retinal venular equivalent (CRVE) in the right eye using a semi-automated computer-assisted program. In all subjects, larger RVD and thicker RNFL demonstrated strong associations. The association between RVD, RNFL thickness and ONH parameters were clarified in the findings and these results provided normal values for middle-aged Caucasians.