The injury was his second to the same eye.
A skate clipped the veteran blue-liner's face during a game in March, requiring 90 stitches to repair the cut. He missed the rest of the regular season but returned for three playoff games.
"I knew there was something going on but I didn't want to think about it because I wanted to play," he said Wednesday, according to The Athletic's Arthur Staple. "You try to play through everything, and I did."
Boychuk, who'll turn 37 in January, played parts of 13 seasons in the NHL and spent the last six with New York. He won the Stanley Cup with the Boston Bruins in 2011, and the Bruins traded him to the Islanders on the eve of the 2014-15 season.
Known for his ability to tee up blistering and accurate slap shots, the longtime rearguard produced 54 goals and 206 points in 725 contests.
The Colorado Avalanche selected Boychuk 61st overall in 2002.