<prompt> Coloured halos are seen in all, except a Mucopurulent conjunctivitis b Acute anterior uveitisc Tetracyclined Glaucomabccacad  <response>: Coloured halos are not seen in acute anterior uveitis and this is one of the differentiating points between acute anterior uveitis and acute angle closure glaucomaTetracycline does not cause coloured halos.Important drugs causing coloured halosAmiodarone Amyl nitrite Chloroquine Chlorpromazine Cortisone Digoxin Fluphenazine Hydrocortisone Oral contraceptives Trimethadione PrednisolonePromethazineSildenafilTriflupromazineWater sterile 