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Visual loss from cataract represents an estimated 50% or more of the global burden of blindness. Time tested, safe and effective technologies are available that could restore near normal vision to a large majority of those affected. Despite this, the magnitude of the global burden of blindness from unoperated cataract continues to increase. The fact that nearly 20 million persons are currently blind from cataract is a reflection of the lack of access to surgical services for a majority of these persons, even though the knowledge and skills required for applying the technology exist. For this reason intervention against cataract blindness has received priority attention in Vision 2020: The Right to Sight. In this context, the monitoring of the outcome of cataract services in general, and cataract surgery in particular, has become imperative.