These "Transactions" are a compilation of the scientific presentation at the 26th Meeting of the European Strabismological Association (ESA) held in Barcelona, Spain, September 14-16, 2000. The meeting was co-hosted by the Spanish Strabology Association (SEE).;The text contains the manuscripts of 44 papers and 20 posters; the edited papers have been grouped into the following topics: amblyopia; strabismus assessment; strabismus and general ophthalmology; cranofacial disorders; esotropia; botulinum; exotropia; Graves' disease; palsies; superior oblique; vertical strabismus; nystagmus; strabismus surgery; and syndromes.