<prompt> Coloured halos are seen in all, exceptCataractAngle closure glaucomaCorneal edemaCorneal opacity  <response>: Causes of coloured halosCorneal edemaGlaucoma elevated IOTClosed-angle glaucomaOpen-angle glaucomaEarly stages of cataractToo intense exposure to light snow blindnessVitreous opacities :- hemorrhage, asteroid bodiesAsymmetric placement of intraocular lensMucopurulent conjunctivitisEpiphoraHypoglycemiaMyopiaForeign bodyDrugsCorticosteroidsAmiodaroneDigoxinChloroquineOCPs 