Macrodiscs in eyes with flat and large corneas.

Showing an interindividual variability of about 1:7, the optic disc area is correlated with various other variables. This study evaluated whether it is associated with the size of the cornea. For 634 normal eyes of 350 subjects and 1,727 glaucomatous eyes of 942 patients, the optic disc area was measured on color stereo photographs and correlated with the radius of the anterior corneal curvature. The latter was compared with the diameters of the cornea for 50 eyes. Highly myopic eyes were excluded. We found that the optic disc size was significantly and positively correlated with the radius of the anterior corneal curvature, which was correlated with the corneal diameters: the larger the optic disc, the larger the curvature radius and the larger the corneal diameters. The results indicate that large optic discs occur preferentially in eyes with flat and large corneas.