What positioning ensures effective light exposure?
Written by
David Nelson
Reviewed by
Prof. Graham Pierce, Ph.D.The correct placement of the light box directly affects the effectiveness of the therapy, as it facilitates the most effective absorption of light rays. Proper placement achieves the maximum benefit to the circadian rhythm and minimizes any eye discomfort. There are guidelines for the optimal distance and angle of placement, ensuring the best treatment outcome while minimizing discomfort during treatment.
Distance Guidelines
- Maintain 16-24 inches between device and eyes
- Measure from light surface not device edge
- Adjust based on manufacturer specifications
- Verify coverage with peripheral vision test
Angular Positioning
- Tilt downward at 15-30 degree angle
- Position slightly above eye level
- Avoid direct upward light projection
- Prevent reflections on glossy surfaces
Set the brightness exactly at eye level or higher. This distributes the incoming light at just the right angle for your eyes. Do not look directly into the light, but observe the forward gaze while allowing yourself to be aware of the peripheral light entering your eyes.
Utilize the peripheral vision test to validate correct coverage. You should see light in your peripheral vision without needing to turn your head. If not, adjust the light to a different distance or angle until it fills your entire visual field. This ensures the total retina exposure for maximum circadian effect.
Maintain consistent positioning throughout each session. Avoid leaning forward or backward once placement is set. Movement reduces light consistency. Use adjustable stands or mounts to secure devices during therapy.
Consider room lighting conditions during placement. Eliminate competing light sources behind or beside the device, and control glare from windows or lamps. Create a consistent lighting environment for each session.
Position seasonally as day length and light levels vary. In the winter months, for example, closer placement may be necessary, as there may not have been as much natural light. Re-evaluate your position monthly using the peripheral vision test and/or note any changes in your journal.
Individuals with vision impairments need special consideration. Consult an ophthalmologist for customized positioning advice. Those using bifocals should remove their glasses during sessions and position devices to account for visual field limitations.
Read the full article: Light Box Therapy Essentials Guide
