A population based eye survey of older adults in Tirunelveli district of south India: blindness, cataract surgery, and visual outcomes
P K Nirmalan, R D Thulasiraj, V Maneksha, R Rahmathullah, R Ramakrishnan, A Padmavathi, S R Munoz, L B Ellwein
British Journal of Ophthalmology May 2002, 86 (5) 505-512; DOI: 10.1136/bjo.86.5.505