 Alternative vision therapies include methods that some patients feel subjectively help them.Many optometrists and ophthalmologists are skeptical of the efficacy of these methods and practices, though some have been found to have at least a basis in studied principles to some limited degree (such as syntonics and melanopsin, TBI and tinted lenses, and the adoption of EMDR by the VA Hospital in the USA).Some physicians are skeptical about the efficacy of "vision therapy" stating that it lacks data and is mostly anecdotal.