The incidence of cataract in India is an overestimate
Thomas, R.; Muliyil, J.
National Medical Journal of India 11(4): 182-184
1998
ISSN/ISBN: 0970-258X PMID: 9808978 Document Number: 490107
Background. Data obtained from surveys using distant direct ophthalmoscopy (DDO) with an undilated pupil for the detection of cataracts suggest an annual incidence of 3. 8 million cataracts and over 9 million cataract-blind people in India today. Method. We recalculated the projections after adjusting for the sensitivity and specificity of DDO. Results. Our calculations suggest that the incidence of cataract may have been overestimated by approximately 60%; corroborative evidence is provided. Conclusions. The specificity and sensitivity of diagnostic tests used in surveys may distort the projected figures and have adverse implications for the planning of services.