Seasonal Affective Disorder: Using Light Therapy - Adventist HealthCare

Seasonal Affective Disorder: Using Light Therapy

Introduction

  • Bright light therapy is an effective treatment for seasonal affective disorder (SAD). The most common light therapy uses a special type of light, called a light box. This is much brighter than a lamp or other light fixture in your home.
  • Light therapy is easy and safe. It has few side effects and can be done at home.
  • People who have eye problems or who take medicines that cause sensitivity to light should not use light therapy without first consulting a doctor.

How is light therapy done?

Place the light box on a desk or table, and sit in front of it at the specified distance. You can do this while you read, eat breakfast, or work at a computer. The light should reach your eyes, but don't stare at the light box.

Light therapy is usually prescribed for 30 minutes to 2 hours a day, depending on the intensity of the light used and on whether you are starting out or have been using it for a while.

Most light therapy is prescribed at 10,000 lux to be used in the early morning. Studies vary as to whether light therapy at other times of the day is less effective. But some people with SAD (perhaps those who wake up normally in the early morning) should do their light therapy for 1 to 2 hours in the evening, ending 1 hour before bedtime. Your doctor can help you decide which light exposure schedule will work best for you.

Light therapy is usually started in the fall and continued through spring.

When you begin light therapy, your first response will show you whether you need to adjust the intensity or duration. Many people respond to light therapy within 3 to 5 days. If you don't respond to treatment within the first week, you may notice improvement in the second week.

The most common side effects of light therapy include headache, eye strain, and nausea. You may be tired during the first week because of changes in your sleep-wake patterns, but this will usually go away after about a week.

References

Other Works Consulted

  • American Psychiatric Association (2010). Practice Guideline for the Treatment of Patients With Major Depressive Disorder, 3rd ed. Available online: http://psychiatryonline.org/guidelines.aspx.

Credits

Current as ofSeptember 11, 2018

Author: Healthwise Staff
Medical Review: Kathleen Romito, MD - Family Medicine
Alfred J. Lewy, MD, PhD - Psychiatry

Disclaimer: The information contained in this website, and its associated websites, is provided as a benefit to the local community, and the Internet community in general; it does not constitute medical advice. We try to provide quality information, but we make no claims, promises or guarantees about the accuracy, completeness, or adequacy of the information contained in or linked to this website and its associated sites. As medical advice must be tailored to the specific circumstances of each patient and healthcare is constantly changing, nothing provided herein should be used as a substitute for the advice of a competent physician. Furthermore, in providing this service, Adventist HealthCare does not condone or support all of the content covered in this site. As an Adventist health care organization, Adventist HealthCare acts in accordance with the ethical and religious directives for Adventist health care services.

Find a Doctor

Find an Adventist HealthCare affiliated doctor by calling our FREE physician referral service at 800-642-0101 or by searching our online physician directory.

View Doctors

Set Your Location

Setting your location helps us to show you nearby providers and locations based on your healthcare needs.