1. 1. A. K. Khurana, Comprehensive Ophthalmology, 4th edn, pg -210.
2. The low- pressure glaucoma treatement study (LoGTS);Krupin;Ophthalmology,2005
3. 3. Jayachandra Das1, Sharad Bhomaj2, Zia Chaudhuri2, Pankaj Sharma3, Arun Negi3, Abhrajit Dasgupta Profile of glaucoma in major eye hospital in North India, Indian Journal of Ophthalmology 2001, Vol 49(1); 25-3.
4. 4. Anderson DR, Patella VM, Automated Static Perimetry, 2nd edn., St Louis: Mosby 1999: 93-94.
5. 5. Johnson LN, Hill RA, Bartholomew MJ, Correlation of afferent pupillary defect with visual field loss on automated perimetry. Ophthalmology 1988 Dec, 95(12): 1649-55, Comment in ophthalmology 1989 Apr; 96(4): 570-17.