Buffalo Sabres goalie Carter Hutton confessed he struggled with an ongoing vision issue during the 2019-20 season.

After seeking treatment, Hutton discovered he suffered from convergence insufficiency, a disorder in which a person's eyes don't move at the same time. He learned his left eye moved slower than his right and attended therapy throughout the season to correct the problem.

"It started to come back around big time in January," Hutton said, according to Buffalo News' Lance Lysowski.

He added, "(Therapy) became part of my daily routine. I would do a ton of different eye training and things to get better at that. In the moment it was obviously tough. Now, moving forward, I learned a lot of skills to help improve that area and make my eye strength better and work on stuff. We weren't sure what it was. It was something I managed throughout the season."