1. Glaucoma research foundation;Glaucoma Facts Stats,2009
2. Bulletin of the World Health Organization. Available from: http://www.who.int/bulletin/volumes/82/11/feature1104/en/.
3. Glaucoma in India: Facts and figures, Glaucoma Society of India. Available from: https://www.glaucomasocietyofindia.org/about/.
4. Types of Glaucoma, Glaucoma research foundation (2009). Available from: http://www.glaucoma.org/glaucoma/types-of-glaucoma.php.
5. Superpixel classification based optic disc and optic cup segmentation for glaucoma screening;Cheng;IEEE Trans Med Imaging,2013