## **Core Concept**
The National Programme for Control of Blindness (NPCB) in India aimed to control and prevent avoidable blindness. The World Bank assistance during 1994-2001 was crucial in supporting this initiative, focusing on a specific eye condition.

## **Why the Correct Answer is Right**
The correct answer, Cataract, is a leading cause of blindness worldwide, especially in developing countries like India. Cataract is a **clouding of the eye's lens**, which affects vision. The World Bank's financial assistance during 1994-2001 was provided to support cataract surgery and other eye care services under the NPCB. This focused approach aimed to significantly reduce cataract-related blindness.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While glaucoma is a group of eye conditions that damage the optic nerve, it wasn't the primary focus of the World Bank assistance for NPCB during 1994-2001.
- **Option B:** Refractive errors are a common cause of vision impairment but were not the specific condition targeted by the World Bank assistance during this period.
- **Option C:** This option is not provided, but based on the correct answer, the other options are incorrect.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **cataract is a major public health issue** in India and other developing countries. Early detection and surgical intervention are highly effective in restoring vision. The NPCB's efforts, supported by the World Bank, significantly increased cataract surgery rates and improved eye care services.

## **Correct Answer:** D. Cataract.