What can cytologists learn from 25 years of investigations in visual search?

This review aims to provide an insight into the nature and mechanisms of the visual screening of cytological preparations and to discuss the implications for current practice. Visual perception in cytology is under-researched and deserves further investigation. Fundamental issues to be addressed include the mechanisms of visual scanning of cytological preparations and the factors affecting search performance. Answers to these questions will have wide reaching impact on issues such as liquid-based technology, automated screening, training, quality assurance, recruitment and selection of staff, and medico-legal problems.