If it makes you uncomfortable, don't allow it. If you don't mind it, take care to make it a safe and enjoyable interaction.
Our experience has been that some birds like to perch over being held. Poults, pulleys, cockerels, hens, roosters doesnt matter, we've seen it across many types, usually shows up in very young chicks days old (we handle our chicks a lot and surround time with them, so see the personality show up).
Those birds often fly up onto our arms, or if down low, our back or shoulder. Some love to sit on an arm or shoulder while we walk around.
Yes, some will peck at glasses, braces, teeth, or eyes. Usually, we find our birds will look intently before they peck, so it's pretty obvious they are about to peck. We don't let them stay if they are attempting to peck.
And, to change this peck away from delicate eyes, we train our birds as chicks to peck at our shiny rings on our hands. We now offer the ring as we greet the bird and again when on shoulder.
Hope this helps, definitely protect your eyes.
