Fig. 29. Relative risks of microbial keratitis among wearers of different types of contact lens. (Estimates from a meta-analysis of multiple case-comparison studies [Wilhelmus KR: Microbial keratitis associated with contact lens wear. In Kastl PR [ed]: Contact Lenses. The CLAO Guide to Basic Science and Clinical Practice, p 19. Vol 3. Dubuque IA, Kendall/Hunt, 1995].)