I couldn't help but notice the lack when I looked at the last panel of today's comic. Looking over the pages he clearly had them at the beginning but around page 32 or so they disappeared. I can understand not using them for more distant shots. You don't have to bother all the time but when you do close ups on his face they really should still be there.

Unless this is a sign that Parson is turning into an Elfworld units as time goes on...