Efficacy of light therapy in nonseasonal depression: a systematic review.
BACKGROUND
The efficacy of bright light therapy is well established for winter depression but its status in depression without seasonal pattern is unclear.


METHODS
We systematically evaluated available data on the efficacy of light therapy in nonseasonal depression.


RESULTS
We identified 62 reports among which 15 met our predefined selection criteria. The available data show evidence for the efficacy of light therapy as an adjuvant treatment to antidepressants. Trials that evaluated light therapy alone (without antidepressants) in nonseasonal depression yielded inconsistent results.


CONCLUSIONS
Most of the studies extracted poorly controlled the issue of blindness and were limited by small sample sizes. Publication bias may have distorted our estimation of the effect of light therapy.


CONCLUSIONS
Overall, bright light therapy is an excellent candidate for inclusion into the therapeutic inventory available for the treatment of nonseasonal depression today, as adjuvant therapy to antidepressant medication. Future clinical trials of light therapy should distinguish homogenous subgroups of depressed patients in order to evaluate whether light therapy may eventually be considered as stand-alone treatment for specific subgroups of patients with nonseasonal depression.
Even
Christian
C
Centre Hospitalier Sainte-Anne, Clinique des Maladies Mentales et de l'Encéphale, Université Paris V, Paris, France. c.even@ch-sainte-anne.fr
Schröder
Carmen M
CM
Friedman
Serge
S
Rouillon
Frédéric
F
D000928:Antidepressive Agents / Q000627:therapeutic use; D002986:Clinical Trials as Topic; D003131:Combined Modality Therapy; D003866:Depressive Disorder / Q000175:diagnosis / Q000523:psychology / Q000628:therapy*; D006801:Humans; D010789:Phototherapy; D017594:Publication Bias; D016574:Seasonal Affective Disorder / Q000175:diagnosis / Q000523:psychology / Q000628:therapy*; D016896:Treatment Outcome
D000928:Antidepressive Agents