Teletext is difficult to read, partly because of the letter fonts employed. Present fonts are contained in a matrix of 6 (horizontal) × 10 (vertical) elements. Research on matrix characters of optimum legibility started in 1969 at the Institute for Perception Research. Criteria resulting from this research have now been used to design alphanumeric characters in a matrix of 12 × 10 elements for use in Teletext. Several versions of each character were designed and their legibility tested in recognition experiments. The legibility of the best new version for each letter was compared with and shown generally to be greater than that of the presently used version.