Editor,—In the optic disc, all visual afference originating in the photoreceptors of more than 1000 mm²retina is concentrated on an area of about 2 mm² to 3 mm². The retinal ganglion cell axons are nowhere else so densely and tightly packed as in the optic nerve head. It explains the importance of the optic disc for anomalies and diseases of the optic nerve. Regarding the marked interindividual variability of the size of the optic disc,1 we undertook the present study to evaluate whether the dimensions of the optic disc are correlated with the length and weight of the whole body.