Blindness is the inability to see. The leading causes of chronic blindness include cataract, glaucoma, age-related macular degeneration, corneal opacities, diabetic retinopathy and eye conditions in children (e.g. caused by vitamin A deficiency). Age-related blindness is increasing throughout the world, as is blindness due to uncontrolled diabetes. On the other hand, blindness caused by infection is decreasing, as a result of public health action. Three-quarters of all blindness can be prevented of treated

Action plan for the prevention of avoidable blindness and visual impairment for 2014-2019. The 66th World Health Assembly endorsed Universal eye health: a global action plan 2014–2019

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