Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 32 1-2 1994 06 15 21 29 Ziaaddin Yazdian   Ali reza Lashay Ahmad Jawadian Iraj Ahadzadegan 2015 09 28 Twenty six patients with double elevator palsy (DEP) (ranging from 25-90 PD), who had undergone either Callahan or Knapp-Modified-Kanpp Procedure from February, 1981 to February, 1994, were reviewed. We achieved acceptable results in correction of hypotropia in primary position. Three patients gained peripheral fusion and after reviewing the results we concluded that in patients having large-angle hypotropia with DEP, especially when it is accompanied by inferior rectus restriction. Callahan procedure is preferrable; however, in coexisting vertical-horizontal deviation, Modified-Knapp Procedure is recommended. https://acta.tums.ac.ir/index.php/acta/article/view/234 https://acta.tums.ac.ir/index.php/acta/article/download/234/230