There is an increasing body of evidence suggesting cosmetic products routinely applied to the periocular skin and lid margins may have a negative impact on the tears and ocular surface and, in some cases, may be linked with more serious disease. In this review, Sarah Farrant offers an overview of cosmetics, the risks they present and how to advise our patients about their use. (C103516, suitable for one distance learning CPD point for optometrists, contact lens opticians and dispensing opticians)