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OP10.7 | Blindness, Vision Impairment, NPCB and Vision 2020 — SDL Guide (Part 3)

Vision 2020: Right to Sight and the Global Blindness Elimination Agenda

Vision 2020: The Right to Sight was a global initiative launched jointly by the World Health Organization (WHO) and the International Agency for the Prevention of Blindness (IAPB) in 1999, with the goal of eliminating avoidable blindness by the year 2020. India was among the founding partner nations and committed to implementing the Vision 2020 agenda through NPCBVI. The naming of the initiative — 'Right to Sight' — was a deliberate framing choice that positioned access to eye care not merely as a health service but as a human right, consistent with the broader disability rights movement of the 1990s and the United Nations Convention on the Rights of Persons with Disabilities. This rights-based framing had practical consequences: it pressured governments to commit to universal eye health coverage rather than treating eye care as an optional service, and it created accountability mechanisms through WHO reporting frameworks. The initiative identified five disease priorities — cataract, refractive errors, trachoma, onchocerciasis, and vitamin A deficiency — based on their prevalence, preventability or treatability, and the availability of cost-effective interventions. Each priority disease had a specific technical strategy with measurable targets: for cataract, the target was a cataract surgical rate sufficient to eliminate the backlog within a defined timeframe; for trachoma, the SAFE strategy (Surgery, Antibiotics, Facial cleanliness, Environmental improvement) with WHO-defined elimination thresholds; for onchocerciasis, annual ivermectin mass drug administration to interrupt transmission. India benefited particularly from the trachoma component — the systematic SAFE strategy implementation, combined with improved sanitation and antibiotic distribution, led to WHO declaring trachoma eliminated as a public health problem from India in 2017.

Vision 2020 — key strategies:
1. Disease control: Focus on the five leading causes of avoidable blindness globally — cataract, refractive errors, trachoma, onchocerciasis, and vitamin A deficiency (corneal blindness). Each required a specific intervention strategy (cataract surgery scale-up; spectacle provision; SAFE strategy for trachoma; ivermectin mass drug administration for onchocerciasis; supplementation for VAD).
2. Human resource development: Training a sufficient number of ophthalmologists, ophthalmic nurses, and mid-level eye care personnel to meet the global demand — particularly in LMICs where the ophthalmologist-to-population ratio is severely deficient. India's target was training sufficient ophthalmologists to achieve a ratio of 1:50,000 population.
3. Infrastructure and appropriate technology: Developing affordable, effective surgical technology (MSICS/phacoemulsification with foldable IOLs; Snellen chart standardisation; portable slit lamps for outreach) and ensuring supply chains for essential eye medicines and surgical consumables.

Vision 2020 — global and Indian impact:
The initiative made substantial progress — cataract surgical rates increased across South Asia; trachoma has been eliminated as a public health problem in India and several other countries; onchocerciasis programmes dramatically reduced its prevalence in Africa. However, the target of eliminating avoidable blindness by 2020 was not fully achieved — the burden of uncorrected refractive error and diabetic retinopathy continued to grow, and cataract surgery supply has not kept pace with the ageing global population. The initiative has effectively continued beyond 2020 under WHO's 'World Report on Vision' framework, with a renewed target for universal eye health access.

India's achievements under Vision 2020 / NPCBVI:
- Cataract surgical rates increased dramatically (from under 1,000 per million in the 1970s to over 6,000 per million in many states).
- Prevalence of blindness has decreased significantly from the 1986–89 survey to the 2015–19 survey, though the absolute number of blind individuals has not fallen as rapidly due to population ageing.
- Trachoma eliminated as a public health problem from India (WHO announcement 2017).
- Vitamin A supplementation coverage has substantially reduced xerophthalmia-related childhood blindness.

Self-Assessment: Blindness Causes, Definitions, and Programme Knowledge

Verify your retention of the key facts in this SDL with the following recall exercise. These are the minimum knowledge requirements for an MBBS graduate working in a district hospital or PHC. The OP10.7 competency sits at the intersection of clinical ophthalmology and community medicine — unlike most ophthalmology competencies which test clinical skills, this one tests your ability to apply epidemiological knowledge, interpret programme data, and integrate it into clinical practice. In the MBBS professional examination, this topic most commonly appears as short-answer questions asking for definitions (WHO classification of visual impairment; India's operational definition of blindness), causes (leading cause of blindness in India; difference between preventable and treatable avoidable blindness), and programme facts (year NPCB was launched; flagship component of NPCBVI; year Vision 2020 was launched and by whom). These are factual questions that reward candidates who have memorised precise answers over those who have only a vague understanding. The ten questions below are drawn from the most frequently assessed points — if you can answer each one immediately and accurately without referring to the text, you are well-prepared for both the written examination and the community medicine field posting assessment. If any answer is uncertain, mark that question and re-read the relevant section before your next study session.

Key definitions checklist:
1. What is the WHO ICD-11 VA criterion for blindness?
2. What is India's NPCBVI operational definition of blindness?
3. What additional (non-VA) criterion can classify a patient as blind under WHO guidelines?

Causes checklist:
4. What is the single leading cause of blindness in India?
5. Name four other major causes in India.
6. Name two causes that are preventable (before onset) and two that are treatable (after onset).

Programme checklist:
7. In what year was NPCB launched in India? What was it renamed and when?
8. What is the flagship surgical component of NPCBVI?
9. Who launched Vision 2020, and in what year?
10. What is the Indian childhood vitamin A supplementation dose at 6 months of age and at 18 months?

If you cannot answer questions 1, 4, and 8 immediately, re-read the relevant sections. These three facts form the core of the OP10.7 competency as assessed in MBBS professional examinations.