46 tinnitus patients went into this randomised placebo controlled study (it does not say if it was blinded in this abstract). The laser power was 5 mW and the wavelength 650 nm which is very low power for this condition, treatments were 20 mins daily for 3 months. The Tinnitus Handicap Inventory scores improved in the entire sample after treatment but more significantly in the group receiving low-level laser. From the point of view of clinical classification, approximately 61% of irradiated patients had tinnitus severity decreased by one class, in comparison to 35% of the placebo group. A stronger laser might have done better.
