<prompt> All the following drugs cause retinal changes except:TamoxifenAmiadaroneHydroxychloroquineVigabatrin  <response>: Ref: Basak s Essentials of Ophthalmology, 5th edition, Harrison s, Nelson sExplanation:Drugs Affecting Retina and Optic NerveDrugSide effectsOxygen Retinopathy of prematurityDigitalis Disturbance of colour vision Scotoma PhotopsiaQuinidine Optic neuritisThiazides Xanthopsia Yellow visionAmiodarone Corneal deposits Vortex or Whorl keratopathy Anterior subcapsular cataract Optic neuritisPhenothiazmes Oculogyric crisesFemale sex hormones Retinal artery and vein occlusion Papilledema Ocular palsy Nystagmus Optic neuropathy Retinal vasculitis Macular edema Scotoma Mydriasis CylcoplegiaChloramphenicol Optic neuritis and atrophyStreptomycin Optic neuritisChloroquine Macular changes Central scotoma Bulls eye maculopathy Pig mentary degeneration of retinal Chloroquine keratopathy Ocular palsy Ptosis ERG depressionIodochorhydroxyquin Optic atrophyEthambutol Optic neuritis and atrophyIsoniazid Optic neuritis and atrophyLead compounds Optic atrophy PapilledemaPenicillamine Ocular pempnigoid Optic neuritis Ocular myastheniaVitamin A Papilledema Retinal hemorrhages Loss of eyebrows and eye ashes Nystagmus DiplopiaVitamin D Band shaped keratopathySalicylates Nystagmus Rehnal hemorrhages Cortical blindnessPnenylbutazone Retinal hemorrhagesVigabatrin Irreversible diffuse atrophy of retinal nerve fibres due to taurine depletionBASED ON RETINAL PATHOLOGYPigmentary RetinopathyQuinotones.Thioridazine.Deferoxamine.Choroidal ToxicityTopiramate.Metronidazole.Macular EdemaLatanoprost.Epinephrine.Niacin.Rosiglitazone.Crystalline RetinopathyTamoxifen.Canthaxanthine.Talc.Misc - MechanismsDigoxins - Inhibits Retinal ATPase.Sildenafil - Alters retinal cGMP levels by inhibiting retina specific PDE6.Interferon - Retinopathy. 