We have several examples.
It was the 80s. Eye patches and facial scars were part of the milieu by default. Who can forget Trev-R from the original Shrapnel, who was missing his left eye, for example (FASA 8611, pp. 10-11)? Marshigama's Legionnaires had two MechWarriors sans eyes*, Michael Sumoron and Garrell Nowack (and possibly David O'Moshey; his left eye is scarred above and below and is a different color than his right; and while heterochroma iridium is a thing, I doubt it is the answer here) (House Liao Sourcebook, FASA 1624, p. 97)
As well as other art--who may or may not be MechWarriors, of course--in The Mercenary's Handbook (FASA 1616, pp. 43, 45), or the Lindon's Company trooper (almost assuredly a MechWarrior through inference) on p. 147 of the House Davion Sourcebook (FASA 1623).
*It always seems to be the left eye, just so we are clear. Maybe losing your right eye disqualifies the sufferer from driving a bipedal war-machine?