The use of light as a medical treatment has grown considerably over the past few years. There are now many kinds of devices, which deliver various different types of light for an ever-increasing number of potential uses.

Ultra - Violet light, for example, has been used to treat psoriasis (a skin disease) for a number of years, and many people use light boxes during the winter to reduce the symptoms of seasonal affective disorder (SAD). Simply, exposure to certain kinds of light often makes people feel better!