Use for a maximum of 8 hours per day. Lenses can be used for 3 months once opened. Use ONLY appropriate contact lens solution. Check the expiry date on the packaging and don't use if it has expired. Clean your contact lenses and case every two days (even if not used). Do not sleep with the lenses in. The composition of the lenses is 38% water and 62% Polymacon. The lens size is base curve - 8.6mm to 8.8mm and the diameter is approximately 15.2mm.