▁when ▁this ▁mus cle ▁is ▁non - function al ▁( as ▁in ▁tro ch lear ▁p als y ) ▁the ▁eye ▁ex cy cl ot ort s ; ▁i . e . ▁tw ists / rot ates ▁out ward . ▁This ▁ex cy cl ot ors ion ▁may ▁be ▁corrected ▁through ▁surg ery ▁using ▁the ▁Har ada - I to ▁procedure . ▁ ▁A ▁version ▁is ▁an ▁eye ▁movement ▁involving ▁both ▁eyes ▁moving ▁synchron ously ▁and ▁symmet r ically ▁in ▁the ▁same ▁direction . ▁Ex amples ▁include : ▁De xt ro version ▁/ ▁right ▁gaz e ▁La e vo version ▁/ ▁left ▁gaz e ▁S urs um version ▁/ ▁elev ation ▁/ ▁up ▁gaz e ▁De ors um version ▁/ ▁de pression ▁/ ▁down ▁gaz e ▁De xt roe lev ation ▁/ ▁gaz e ▁up ▁and ▁right ▁De xt ro de pression ▁/ ▁gaz e ▁down ▁and ▁right ▁La e vo e lev ation ▁/ ▁gaz e ▁up ▁and ▁left ▁La ev ode pression ▁/ ▁gaz e ▁down ▁and ▁left ▁De xt ro cyc lo version ▁– ▁top ▁of ▁the ▁eye ▁rot ates ▁to ▁the ▁right ▁La ev oc yc lo version ▁– ▁top ▁of ▁the ▁eye ▁rot ates ▁to ▁the ▁left ▁ ▁See ▁also ▁▁▁ ▁Con ver gence ▁micro ps ia ▁ ▁Dis soci ated ▁vertical ▁deviation ▁ ▁E ye ▁tracking ▁ ▁Gaz e - con ting ency ▁parad ig m ▁ ▁List ing ' s ▁law ▁ ▁Mic ros ac cade ▁ ▁O cular ▁trem or ▁ ▁E ye ▁movement ▁bi