Even though users of light therapy are often advised not to look directly at the light source, the mechanisms of the eye focus incoming light onto the macula, the small region of the retina where vision takes place, and where age-related macular degeneration occurs. Since blue light wavelength make up only a small percentage of the light in white light, any form of light therapy using a high proportion of blue light therefore risks subverting a variety of defensive mechanisms that protect the retina against blue light hazard. These defensive mechanisms include the anatomical positioning and structure of eye and its surrounding features, as well as human posture, which makes it awkward for humans to gaze upwards for long periods of time. Sunnex Biotechnologies, 2008)

The work of David H. Sliney entitled: "Ocular Hazards of Light" presented at the International Lighting in Controlled Environments Workshop states the following risks and...
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