Tiresias is a family of TrueType sans-serif typefaces that were designed with the aim of legibility by people with impaired vision at the Scientific Research Unit of Royal National Institute of Blind People in London.

[1] The name likely refers to Tiresias from Greek Mythology, a blind prophet of Apollo.

[2][3] It was mandated for use on UK (DVB-T) by the Independent Television Commission[4] and is still one of the fonts recommended for use by Ofcom.

[5] However, the font has come in for criticism for the development and testing process, the lack of italics and design.

[6] The Tiresias Screenfont was sold by Bitstream Inc., who in 2012 were acquired by Monotype Corporation.