What is Light Therapy?
Light Therapy (or phototherapy) emits light that mimics sunlight in the hopes of changing the brain chemistry so as to ease seasonal affective disorder (SAD), a form of depression that is linked to a particular season each year (Example, winter). Its salubrious effect has been observed in a number of other disorders such as non-seasonal depression, insomnia, jet lag, adjusting to nighttime work shift, dementia, etc.
History of Light Therapy:
In places like ancient Egypt, Greece, and Rome around 1400BC, the healing effects (mostly anecdotal) of sunlight were noted for various diseases. This form of therapy was called heliotherapy.
Around the second half of the 19th century, people became interested in heliotherapy and a number of observations were made in research. The important observations during this time period were:
By the end of the century, researchers realized that the UV rays from the sun were important for heliotherapy’s therapeutic effects. With this knowledge, phototherapy was developed and became an alternative for heliotherapy.
Further investigation of phototherapy occurred throughout the 20th century.
How does Light Therapy work?
In the treatment of SAD
Treatment of Skin disorders
The risks of Light Therapy:
The success of the therapy relies on three main elements: duration, timing and sensitivity. It is therefore important to first discuss this therapy with a physician. It is essential to be consistent and not to overdo the therapy for there are some risks:
In the case of SAD treatment
In the case of skin treatment
Guidelines are in place to reduce the risks; however, it is imperative to discuss the therapy and any symptoms with a licensed physician.
Scientific evidence:
Research on SAD:
A meta-analysis of about 20 different randomized, controlled trials of light therapy for mood disorders reported the following:
There is strong evidence that phototherapy can improve the symptoms (not cure) multiple mood disorders.
Research on skin disorders:
A word of caution:
Light therapy boxes are available in a wide range of stores and it is important to be familiar with the features and options. Please consult with your healthcare provider before initiating alternative therapies. Tell your healthcare provider about any complementary and alternative practices you use. Give them a full picture of what you do to manage your health. This will help your healthcare provider assess your clinical situation better. This will also help them take appropriate clinical measures to assist you. Full disclosure to your healthcare provider will help ensure coordinated and safe care.
Written by Monique Richards
References:
Roelandts, R. (2002). The history of phototherapy: Something new under the sun? Journal of the American Academy of Dermatology, 46(6), 926-930.
DermNet NZ. (n.d.). Retrieved February 19, 2016, from http://www.dermnetnz.org/bacterial/tuberculosis.html
Light therapy. (n.d.). Retrieved February 19, 2016, from http://www.mayoclinic.org/tests-procedures/light-therapy/basics/results/prc-20009617
Psoriasis Vulgaris of Vulva. (n.d.). Retrieved February 19, 2016, from http://www.dovemed.com/diseases-conditions/psoriasis-vulgaris-vulva/
Golden, R. N., Gaynes, B. N., Ekstrom, R. D., Hamer, R. M., Jacobsen, F. M., Suppes, T., . . . Nemeroff, C. B. (2005). The Efficacy of Light Therapy in the Treatment of Mood Disorders: A Review and Meta-Analysis of the Evidence. American Journal of Psychiatry AJP, 162(4), 656-662.
Phototherapy: UVB - American Osteopathic College of Dermatology (AOCD). (n.d.). Retrieved February 19, 2016, from http://www.aocd.org/?page=PhototherapyUVB
Phototherapy. (n.d.). Retrieved February 19, 2016, from https://www.psoriasis.org/about-psoriasis/treatments/phototherapy
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