McCann, who said he has never worn glasses while playing, has had difficulty with blurred vision this season. He was placed on the disabled list on April 25, retroactive to April 23, and tried new contact lenses on a minor league rehabilitation assignment with Class A Myrtle Beach.
The new lenses provided only a temporary fix before "it would go right back to being dry again," McCann said while wearing new glasses.
McCann said eye drops didn't help.
"It's just not right on my eye," McCann said of the contacts. "It doesn't feel good."
McCann had laser surgery on his eyes after the 2007 season. He said the procedure changed the shape of his eyes, making contacts more difficult to wear.
He said another surgery is an option he hopes to avoid, at least until after the season.
McCann took batting practice Friday while wearing glasses. He said he has ordered sports glasses he hopes will be comfortable enough to wear while catching, possibly with a new hockey style helmet.
McCann, who has a .295 career batting average, is hitting .195 with two home runs and seven RBI in 13 games.
Braves manager Bobby Cox said McCann will return to the minor leagues as early as Sunday as he tries to adjust to the glasses.
"Hopefully that will settle everything," Cox said, adding it is possible McCann may have to wear the glasses only when he is hitting.