<prompt> Ethambutol is associated withRed-green colour blindnessRed-blue colour blindnessBlue-green colour blindnessYellow-green colour blindness  <response>: Ethambutol may cause optic neuritis ocular toxicity: 463 National Health Programmes, Policies and Legislations in IndiaReview of Preventive and Social MedicineIt may lead to red-green color blindnessPatients may thus develop blue visionThus it is contraindicated in children 6 years age, as they may not be able to report any deterioration of color vision. 