Epidemiology in practice series

A series of articles, published in the journal between 1997 and 1999, on the different types of epidemiological study that eye health workers can use in their prevention of blindness work.

• An introduction

• Sample size calculation for eye surveys: a simple method

• Disease incidence

• Randomised controlled trials

• Disease prevalence

• Case-control studies

• Screening for eye disease

• Qualitative methods