Braille Cell Dimensions

Every major braille producing country has standards for braille character spacing and minimum height of the dots in each braille cell. The majority of countries have adopted the braille character standard produced by the Perkins mechanical braille writer. When this standard was first established decades ago, extensive testing was done with a large number of braille readers to determine the optimum characteristics for good quality braille. This is the standard used today by the United States Library of Congress and several other international agencies that oversee the production of books, magazines and other materials in braille.