Early light treatment can prevent an emerging winter depression from developing into a full-blown depression.

The administration of light at the development of the first signs of a winter depression appears to prevent it from developing into a full-blown depression. Not a single patient from a group of 16 treated this way became severely depressed during the remaining part of the winter season, whereas 5 out of 11 from the non-treated control group did.

RCT Entities:   Population Interventions Outcomes