The Phillies originally said Saturday that Myers injured an eye while playing catch with his 4-year-old son.
Later in the day, Phillies spokesman Kevin Gregg said Myers told general manager Ruben Amaro Jr. he actually slipped while getting out of his truck and hit his face on Friday night.
"Brett told us one story and then he told us this story," Gregg said. "We were misinformed by Brett.
"He slipped getting out of his truck last night, hit his face and suffered significant swelling around his eye."
Gregg said each version of the injury was reported by Myers to Amaro.
Myers, out since May 28 due to a torn labrum in his right hip, had been scheduled to pitch one inning for Class A Clearwater on Saturday night.
There was no immediate update on the severity of the eye injury. Gregg said Myers was icing the injury on Saturday and will be examined by Phillies medical staff in Clearwater on Sunday.