B rit ish ▁MP s ▁ 1 7 6 1 – 1 7 6 8 ▁Category : High ▁Sher iffs ▁of ▁York shire ▁Category : M embers ▁of ▁the ▁Parliament ▁of ▁Great ▁Britain ▁for ▁English ▁constitu encies <0x0A> </s> ▁Dis soci ated ▁vertical ▁deviation ▁( D VD ) ▁is ▁an ▁eye ▁condition ▁which ▁occurs ▁in ▁association ▁with ▁a ▁squ int , ▁typically ▁infant ile ▁es otrop ia . ▁The ▁exact ▁cause ▁is ▁unknown , ▁although ▁it ▁is ▁logical ▁to ▁assume ▁it ▁is ▁from ▁fault y ▁inner v ation ▁of ▁eye ▁mus cles . ▁ ▁Pres entation ▁ ▁The ▁eye ▁dr ifts ▁up ward ▁sp ont ane ously ▁or ▁after ▁being ▁covered . ▁ ▁The ▁condition ▁usually ▁affect s ▁both ▁eyes , ▁but ▁can ▁occur ▁un il ater ally ▁or ▁asym met r ically . ▁It ▁is ▁often ▁associated ▁with ▁lat ent ▁or ▁manifest - lat ent ▁n yst ag mus ▁and , ▁as ▁well ▁as ▁occurr ing ▁with ▁infant ile ▁es otrop ia , ▁can ▁also ▁be ▁found ▁associated ▁with ▁ex otrop ias ▁and ▁vertical ▁devi ations . ▁ ▁DVD s ▁are ▁usually ▁controlled ▁from ▁occurr ing ▁with ▁both ▁eyes ▁open , ▁but ▁may ▁become ▁manifest ▁with ▁in att ention . ▁Usually ▁some ▁level ▁of ▁dis soci ative ▁occ l usion ▁is ▁required ▁- ▁to ▁trigger ▁the ▁brain ▁to ▁suppress ▁vision ▁in ▁that ▁eye ▁and ▁then ▁not ▁control ▁a ▁DVD ▁from ▁occurr ing . ▁The ▁level ▁of ▁dis soci ative ▁occ l usion ▁required ▁may ▁involve ▁using ▁a ▁red ▁filter , ▁a ▁dark