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Eye care programs, in developing countries, are often planned using the prevalence of blindness and visual impairment, often estimated from Rapid Assessment of Avoidable Blindness (RAAB) surveys. A limitation of this planning approach is that it ignores the annual overall eye care requirements for a given population. Moreover, targets set are arbitrary, often influenced by capacity rather than need. To address this lacunae, we implemented a novel study design to estimate the annual need for comprehensive eye care in a 1.2 million populations. We conducted a population based longitudinal study in Theni district, Tamil Nadu, India. All permanent residents of all ages were included. We conducted the study in three phases, (i) household level enumeration and enrollment, (ii) basic eye examination (BEE) at household one year post enrollment, and (iii) assessment of eye care utilization and full eye examination (FEE) at central locations. All people aged 40 years and above were invited to the FEE. Those aged <40 years were invited to the FEE if indicated. In the main study, we enrolled 24,327 subjects (58% aged below 40 years and 42% aged 40 years and above). Of those less than 40 years, 72% completed the BEE, of whom 20% were referred for FEE at central location. Of the people aged ≥40 years, 70% underwent FEE. Our study design provides insights for appropriate long term public health intervention planning, resource allocation, effective service delivery, and designing of eye care services for resource limited settings. [ABSTRACT FROM AUTHOR]

India has done well in eye care delivery by recognizing visual impairment and blindness as a major medical challenge. Major contributions have come from ophthalmologists (mass cataract surgery in the early 1900s; major participation of non-government organizations), policy makers (National Program for Control of Blindness and Visual Impairment 1976; systematic development under the World Bank assisted India Cataract Project, 1995-2002), and the industry (manufacturing of affordable surgical instruments and medicines). Although the country could boast of higher cataract surgical coverage and near-total elimination of trachoma, there is increasing prevalence of diabetic retinopathy and undetected glaucoma. India is in the crossroad of adherence to old successful models of service delivery and adoption of new innovative methods of teaching and training, manpower development and skill-based training, relevant medical research and product development. In the absence of these new approaches, the initial gains in eye care could not be furthered in India. A new approach, that will combine the best of the "old" tradition of empathy and the "new" technology of analytics, is required to imagine the future of eye care in India. [ABSTRACT FROM AUTHOR]