“PANIPAT, India — Shivam Kumar’s failing eyesight was manageable at first. To better see the chalkboard, the 12-year-old moved to the front of the classroom, but in time, the indignities piled up.

Increasingly blurry vision forced him to give up flying kites and then cricket, after he was repeatedly whacked by balls he could no longer see. The constant squinting gave him headaches, and he came to dread walking home from school.”

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