Designed specifically for use during chemical disinfection of soft contact lenses the Bausch & Lomb ReNu leak proof lens case is compact, durable, and easy to use. To prevent lens mix-ups, left and right caps are clearly marked. The caps form a leak-proof seal, and they open and close easily. Lens cases can be a significant source of microbial contamination. To help prevent eye infections, lens cases should be cleaned, rinsed, and air dried every day and replaced at least every three months. Never use tap water to clean your lens case.