An eye infection will keep Bob Costas off NBC's prime-time Olympic broadcast for a second straight night.

Costas said on a ''Today'' show phone call Wednesday that his eyes are so sensitive that they are tearing up even in dim light. Matt Lauer will again replace him.

Costas began the Olympics with a viral infection in his left eye, replacing his contact lenses with glasses. By Monday, the infection had spread to his right eye, both so reddened they became a topic of conversation for people watching the telecasts in the United States.

Lauer is doing double duty on the ''Today'' show, broadcast in mid-afternoon Sochi time and the prime-time broadcast done in the middle of the night local time.

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide - from Peter King, Tom Verducci, Lee Jenkins, Seth Davis, and more - delivered straight to you, along with up-to-the-minute news and live scores.