What is the difference between these 2? I think Smartxide Doc & Fraxel Repair are both ablative fractionated lasers. Is there any difference besides manufacturer? Also, what pain options are usually given with a CO2 laser treatment - eyes v full face? I had my lower eyelids done w/ only topical, b/c doctor said injections of lidocaine would increase swelling. What is normally used for full face? Do you ever administer IV sedatives or is it mostly done with injections to the face? Thanks.