Medicines and medical devices usually require primary and secondary packaging, each of which contains important information. Medicines are packaged in vials, syringes, infusion bags, blister packs, and so on. These containers are again packed in cartons, in sleeves or on pallets for transport.
The containers are made of a variety of materials such as glass, plastic, metal foil, paper and cardboard. The materials are rigid or flexible, glossy or matte, transparent or reflective. Some labels are pre-printed, while others are printed after they are applied to the container. These variables affect how the printed information can be displayed and perceived.
In addition, lettering on flexible or rounded packaging often does not look the same as on a flat surface but is slightly distorted. With glossy and transparent surfaces, the ambient light changes the perception.