, ▁the ▁eye ▁area ▁sw ells ▁so ▁much ▁that ▁the ▁eyes ▁become ▁difficult ▁or ▁impossible ▁to ▁close ▁fully . ▁Sometimes , ▁it ▁may ▁also ▁appear ▁as ▁if ▁the ▁e y eb all ▁has ▁moved ▁slightly ▁backwards ▁from ▁the ▁white ▁part ▁of ▁the ▁eye ▁due ▁to ▁the ▁fluid ▁filled ▁in ▁the ▁conj unct iva ▁all ▁over ▁the ▁eyes ▁except ▁the ▁ir is . ▁The ▁ir is ▁is ▁not ▁covered ▁by ▁this ▁fluid ▁and ▁so ▁it ▁appears ▁to ▁be ▁moved ▁slightly ▁in wards . ▁ ▁C aus es ▁▁ ▁It ▁is ▁usually ▁caused ▁by ▁all erg ies ▁or ▁vir al ▁in fe ctions , ▁often ▁inc iting ▁excess ive ▁eye ▁rub bing . ▁Chem osis ▁is ▁also ▁included ▁in ▁the ▁Ch and ler ▁Classification ▁system ▁of ▁orb ital ▁in fe ctions . ▁ ▁If ▁chem osis ▁has ▁occurred ▁due ▁to ▁excess ive ▁rub bing ▁of ▁the ▁eye , ▁the ▁first ▁aid ▁to ▁be ▁given ▁is ▁a ▁cold ▁water ▁was h ▁for ▁eyes . ▁ ▁Other ▁causes ▁of ▁chem osis ▁include : ▁Super ior ▁v ena ▁c ava ▁obst ruction , ▁accompanied ▁by ▁fa cial ▁o ed ema ▁Hyper thy roid ism , ▁associated ▁with ▁ex oph th al mos , ▁per ior b ital ▁pu ff iness , ▁lid ▁retra ction , ▁and ▁lid ▁lag ▁Ca vern ous ▁sin us ▁th rom b osis , ▁associated ▁with ▁in fection ▁of ▁the ▁par anas al ▁sin uses , ▁pro pt osis , ▁per ior b ital ▁o ed ema , ▁ret inal ▁ha emor rh ages