Colour changing contact lenses are cosmetic lenses that are designed to change the colour of your eye to another, natural looking colour. They are designed to cause a colour change not noticeable by other people.
Whereas colour changing lenses are designed to actually change the colour appearance of your eyes, colour enhancing lenses simply add a "shine" or brightness, accentuating the natural colour of your eyes. Please see the colour enhancing contact lenses section for these lenses.