1. Armaly MF. The correlation between appearance of the optic cup and visual function. Trans Am Acad Ophthalmol Otolaryngol 1969;73: 898–913.
2. Spaeth GL, Hitchings RA, Sivalingam E. The optic disc in glaucoma: pathogenetic correlation of five patterns of cupping in chronic open angle glaucoma. Trans Am Acad Ophthalmol Otolaryngol 1976;81:217–223.
3. Sommer A, Pollack I, Maumenee AE. Optic disc parameters and onset of glaucomatous field loss. I. Methods and progressive changes in disc morphology. Arch Ophthalmol 1979; 97:1444–1448.
4. Pederson JE, Anderson DR. The mode of progressive disc cupping in ocular hypertension and glaucoma. Arch Ophthalmol 1980; 98:490–495.
5. Robert Y. Die klinischen Untersuchungsmethoden der Papille: Ihre Bedeutung für die Glaukom-Früherkennung. Enke, Stuttgart, 1985.