[Morphometry of protuberant changes of the optic nerve head]

For objective evaluation of elevated changes in the optic nerve head, volumetric measurement of optic nerve heads in normal eyes, and in eyes with optic neuritis and papilledema was performed using a three-dimensional computerized digital image analyzer. To determine the reliability of the data, both intraphotographic and interphotographic error variance was studied. The reproducibility of the data was good, because the coefficient variation of elevated volume was small, 1.0 to 8.3% (mean; 4.5%) on intraphotographic study and 0.8 to 11.5% (mean; 6.5%) on interphotographic study in the optic neuritis and papilledema. The accuracy of the data was good enough for clinical use, presuming a change of less than 0.05 mm as measuring error.