Imagine living in a world without light and direction. Nearly 10 million people travel through a world of shadows and darkness every day. They are unmoved by a magnificent sunset or an artist's masterpiece. The contents of a can might be marinara or motor oil. Unfamiliar streets are as forbidding as a trackless desert, and every page of an instruction manual might as well be blank.
Partial or total blindness may result from illness or injury. A person's vision may have been absent from birth, or it might have dimmed with time and age. They may see indistinguishable shapes moving in a land of shifting light, or just an unrelieved dark void. No matter the cause or the degree, the visually impaired must navigate the unknown and learn to compensate in a world where daily life demands sight.
