## Core Concept
The "Vision 2020: Right to Sight" initiative is a global campaign aimed at eliminating avoidable blindness by the year 2020. It focuses on preventing and treating diseases that cause blindness, particularly in developing countries.

## Why the Correct Answer is Right
The correct answer, **D. Eliminate avoidable blindness**, aligns with the primary goal of Vision 2020. This initiative was launched by the World Health Organization (WHO) and the International Agency for the Prevention of Blindness (IAPB) with the aim of eliminating avoidable blindness through comprehensive eye care. The focus is on diseases such as cataracts, refractive errors, and low vision, which are major causes of blindness worldwide.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because while Vision 2020 does involve global cooperation, its primary aim is not just to promote international collaboration but to achieve a specific goal related to eye health.
- **Option B:** This option is incorrect as Vision 2020 is specifically focused on eye health and blindness prevention, not on general healthcare for the elderly.
- **Option C:** This option is incorrect because, although research and development are crucial in the broader context of healthcare and could contribute to the goals of Vision 2020, they are not the primary focus of this initiative.

## Clinical Pearl / High-Yield Fact
A key point to remember is that Vision 2020 emphasizes a comprehensive approach to eye care, including prevention, treatment, and rehabilitation of patients with visual impairments. A notable aspect of this initiative is its focus on making eye care accessible and affordable, particularly in low- and middle-income countries.

## Correct Answer: D. Eliminate avoidable blindness