Draco quite liked Harry's glasses. Most people didn't.
Draco liked how they hid the other's beautiful eyes from sight. Most people didn't bother to look at Harry's eyes, they just focused on the glasses.
Yes, Draco was possesive. Harry's eyes were his, like Harry was his. They were together, and as Draco now belonged to Harry, Harry belonged to Draco. Including his eyes.
Harry knew this, and that was why he always refused to let Hermione fix his eyes.