title: The Hirschberg test: a double-masked clinical evaluation.
abstract: Though the Hirschberg test has been used for over a 100 years, several different formulas are still being recommended and used clinically to determine the amount of a given ocular deviation. The purpose of this study was to obtain a double-masked clinical evaluation of the Hirschberg test. Several strabismic patients were evaluated by one investigator using the alternate cover test and by another investigator using a photographic Hirschberg procedure in a double-masked procedure. It was determined that the Hirschberg test can be used for strabismic patients of all ages and that the most appropriate formula to use is 1 mm = 22 delta.
authors.affiliation: School of Optometry, University of Alabama, Birmingham.
authors.forename: J B
authors.initials: JB
authors.lastname: Eskridge
authors.forename: B
authors.initials: B
authors.lastname: Wick
authors.forename: D
authors.initials: D
authors.lastname: Perrigin
mesh_terms: D002986:Clinical Trials as Topic; D003315:Cornea / Q000503:physiopathology; D004311:Double-Blind Method; D005403:Fixation, Ocular; D006801:Humans; D008027:Light; D012018:Reflex; D013285:Strabismus / Q000503:physiopathology*; D014787:Vision Tests / Q000592:standards*