1. Whitcher JP, Srinivasan M, Upadhyay MP . Corneal blindness: a global perspective. Bull World Health Organ 2001; 79(3): 214–221.
2. Whitcher JP, Srinivasan M . Corneal ulceration in the developing world—a silent epidemic. Br J Ophthalmol 1997; 81: 622–623.
3. American Academy of Ophthalmology. Basic and Clinical Science Course, Sect. 8. External Disease and Cornea. American Academy of Ophthalmology: San Francisco, 1992, p 61.
4. Cullom RD, Chang B . Diagnosis and Treatment of Eye Disease, 2nd edn. JB Lippincort: Philadelphia, 1994, p 70.
5. Jones DB, Leisegang TJ, Robinson NM . Laboratory Diagnosis of Ocular Infections, Cumitech 13. American Society for Microbiology: Washington, DC, 1981.