1. Anderson DR. Perimetry with and without automation, 2nd ed. Mosby, St. Louis Washington Toronto, 1987
2. Aulhorn E, Harms H. Early visual field defects in glaucoma. In: Leydhecker W (ed) Glaucoma Symposion Tutzing Castle 1966. Karger Basel, New York 1967, pp 151–186
3. Aulhorn E, Karmeyer H. Frequency distribution in early glaucomatous visual field defects. In: Greve EL (ed) Second International Visual Field Symposium, Tübingen 1976. Junk, Den Haag, 1977., pp 75–83
4. Drance SM. The glaucomatous visual field. Invest Ophthalmol Vis Sci 11: 85–97, 1972
5. Harrington DO. The visual fields. 3. ed. Mosby, St Louis, 1973