The legendary singer — who was a presenter at the 2025 Golden Globes — previously said he lost sight in his right eye, while his left eye is "not the greatest"

John also said Carlile, who collaborated with him on the song "Never Too Late" for the new documentary about him is "a fantastic writer as well as a fantastic vocalist."

"I just want to reassure everybody that it's not as bad as it seems," the musician said at the 2025 Golden Globes