"I do not recommend you go test your airbags the way we did the other night," Glenn said.
Neither Glenn nor his wife was seriously injured, said Dr. Paul Beery. Beery said the former senator suffered a minor fracture in his sternum.
"As far as this being minor, it's not minor to me because it hurts," said the 85-year-old Glenn.
Annie Glenn, 86, is recovering from what her husband called "bumps and bruises."
The couple was returning home late Friday from a fundraiser for gubernatorial candidate Ted Strickland, when John Glenn tried to make a left turn onto a highway ramp, said his former press secretary Dale Butland.
An oncoming car hit the front end of Glenn's car. The driver, Amy Myers of suburban New Albany, was not injured. Police cited Glenn for failure to yield, Butland said.
Glenn, who served in the Senate from 1974 to 1998, first made headlines in 1962, when he piloted the first manned orbital mission of the United States. He went back into space in 1998, at the age of 77.