A multitude of activities are carried out under the label of "prevention of blindness". A definition of this term and of related concepts is discussed with the aim of rationalizing and bringing more precision into the planning and evaluation of programmes in this field. Emphasis is placed on the importance of an appropriate eye-health information system, of a systems-analysis methodology for the rational planning of eye-health services and of the necessary manpower in the field of public health ophthalmology. A definition of this field is presented and illustrated by a conceptual systems model. Key-words:public health ophthalmologyeye-health planningvisual impairmentblindnesssystems analysispreventioneye-health information system.

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