Enzymatic degradation of colorant in lens care solutions

A lens care kit for cleaning and disinfecting contact lenses, comprising:

• a colored lens care solution including a water-soluble colored protein and a microbicide;
• and a proteolytic enzyme immobilized on a solid support, wherein the colored lens care solution is a multiple purpose solution and the colored lens care solution is free of hydrogen peroxide,
• wherein, when in contact with the colored lens care solution, the proteolytic enzyme degrades the colored protein over a time period sufficient to substantially decolorize the colored lens care solution, thereby indicating that lenses being disinfected and cleaned by the colored lens care solution are ready for use.