Tobacco amblyopia is due to:
Correct Answer: Cyanide
Description: Ans: a (Cyanide) Ref: AK Khurana, 3 ed, p. 282; 4th ed, p. 296Tobacco amblyopia is due to cyanide.Tobacco amblyopiaEtiology:Heavy smokers, heavy drinkers & a diet deficient in proteins & vitamin B12C/F:B/L gradually progressive loss of visionB/L centrocaecal scotomaBRIDGE Photoretinitis is due to Infrared raysSnow blindness & photoophthalmia are due to UV rayFundus examination: Temporal pallor of optic disc/ normal optic discExcessive tobacco smoking: Decrease cyanide detoxification due to deficiency of sulphur rich proteinsExcess cyanide in blood - degeneration of ganglion cells - degeneration of papillomacular nerve bundle-atoxic amblyopiaTreatment:1. Cessation of smoking2. Inj. Hydroxycobalamine 1000 ug IM weekly for 10 weeks3. Health care & nutritionCauses of centrocaecal scotoma:Ring scotoma;Lebers ischemic optic neuropathyVitB12 deficiencyTobacco amblyopiaMyopiaRetinitis pigmentosaPrimary open angle glaucomaPapilltisSarcoidosisLeukaemiaTubular vision;Retinitis pigmentosaPOAGCentral scotoma:Relative positive scotoma:RB neuritisEthambutolMacular hole; cyst degenerationCentral serous retinopathyPhotoretinitis
Category:
Ophthalmology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now