BLUE LIGHT RISK AND LIGHT THERAPY

摘要

Light therapy for the treatment of sleepdisorders and jet-lag, as well as for seasonal affective disorder (SAD) has been shown to be effective for many subjects. However, concerns are sometimes expressed about the safety of viewing relatively bright light boxes used in this type of light phototherapy treatment. Typically, a patient is illuminated - normally not on-axis - by an illuminance of approximately 2,500 lux to 10,000 lux as measured at the corneal plane of the eye for periods ranging up to two hours, or even longer each day. Normally there is little ultraviolet radiation from either fluorescent or LED-array light sources. The greatest concerns have centered on the potential retinal hazard from the "blue-light hazard," as described in photobiological lamp safety standards. Currently evaluated, diffused sources do not pose a hazard.