 Among schools of medicine, ophthalmology does not see merit in the procedures surrounding many of behavioral optometry's practices, arguing that there have not been enough studies of high enough merit to warrant practicing of vision therapy.In a 2008, vision scientist Brendan Barrett published a review of behavioral optometry at the invitation of the UK College of Optometrists.Barrett wrote that behavioral optometry was not a well-defined field but that it was sometimes said to be an "extension" to optometry, taking a holistic approach