Sen. John McCain, R-Ariz., introduced legislation Tuesday requiring TV stations to include audio descriptions of the action in some programs to help serve the visually impaired.

The Television Information Enhancement for the Visually Impaired Act would require audio descriptions of non-audible action for at least 50 hours of stations’ prime-time and children’s programming every quarter.

Video-description services usually are carried on a TV channel’s subcarrier frequencies.

“Since the spectrum that television broadcasters utilize is a public asset, one would expect that programming over the public airwaves is accessible to all Americans,” Sen. McCain said in a statement. “Unfortunately, that is not the case today, and that is why we must pass the TIVI Act.”