The social-media post by former USC linebacker Su’a Cravens saying he has damaged vision because of a concussion has been clarified by Washington coach Jay Gruden.

In a story posted on his Snapchat account Tuesday, Cravens, an NFL rookie for Washington, said he was given prescription eyeglasses as the result of his concussion sustained in the team’s 31-20 victory over the Cleveland Browns earlier this month.

“Due to my concussion, my eyes have lost the memory to keep track of moving objects,” he wrote, “so I have to wear these for the rest of my life.”

“Thanks, concussions,” he added.

The post was later deleted.

But Gruden on Wednesday clarified Cravens’ comments when he spoke at a news conference after practice. Gruden told reporters that Cravens needed to wear glasses only as a part of his rehab.

Cravens, who did not play for Washington last Sunday, was at practice Wednesday, according to local reports.

A report by CSN Mid-Atlantic said there was “zero truth” that Cravens’ vision was permanently impaired by the head injury.

A representative for Cravens could not immediately be reached.

Before enrolling at USC, Cravens attended Vista Murrieta High.