Light therapy can be defined as exposure to daylight or specific wavelengths of light for a prescribed amount of time in order to treat seasonal affective disorder, acne and a myriad of other conditions. Even though this type of treatment is generally very safe, negative effects may occur.
As a consequence of light therapy, patients can complain of irritability, headaches, eye strain, sleep disturbances and insomnia. Mild visual side effects are not unusual, but remit promptly. Therefore determining the appropriate dose and timing of light is essential in order to diminish the occurrence of such side effects.