title: Comparison of initial treatment response to two enhanced-viscosity artificial tears.
abstract: OBJECTIVE
  To compare the effectiveness of 1.0% carboxymethylcellulose (CMC) (Refresh Liquigel, Allergan, Inc., Irvine, CA) and propylene glycol/polyethylene glycol 400 (PG-HPG) (Systane, Alcon, Fort Worth, TX) in providing relief of dry eye symptoms and signs.
  
  
  METHODS
  To evaluate patient comfort and drop preference, patients were given CMC in one eye and PG-HPG in the other. Five minutes after the initial drop application, patients were questioned on overall preference and comfort, as measured by stickiness, blurring, and soothing. Patients were then randomized to receive CMC or PG-HPG in both eyes for 1 week. Fluorescein staining was evaluated at baseline and week 1.
  
  
  RESULTS
  Of patients with a preference, more patients preferred CMC than PG-HPG. Thirty-six percent preferred CMC, and 24% preferred PG-HPG. More (35%) patients found CMC to be more soothing than PG-HPG (22%). After 1 week of treatment, eyes treated with CMC consistently showed less ocular surface staining than did eyes treated with PG-HPG. Mean corneal staining score in the inferior region was significantly lower in the CMC group than in the PG-HPG group (P = 0.008) at week 1. CMC provided a statistically significant decrease in mean corneal inferior staining (P < 0.001), whereas the PG-HPG group (P = 0.185) had no significant change. In the temporal conjunctival region, CMC provided a significantly lower mean staining score than PG-HPG after 1 week of treatment (P = 0.005).
  
  
  CONCLUSIONS
  Patients found CMC to be more comfortable than PG-HPG. After 1 week of use, CMC provided greater relief of dry eye signs and symptoms than PG-HPG.
authors.affiliation: Eye and Ear Institute, University of Arizona, Tucson, USA. noeckerrj@UPMC.EDU
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Noecker
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry / Q000627:therapeutic use*; D003228:Conjunctiva / Q000187:drug effects / Q000473:pathology; D003315:Cornea / Q000187:drug effects / Q000473:pathology; D004338:Drug Combinations; D015352:Dry Eye Syndromes / Q000188:drug therapy* / Q000473:pathology; D006801:Humans; D008875:Middle Aged; D009883:Ophthalmic Solutions; D017060:Patient Satisfaction; D014677:Pharmaceutical Vehicles / Q000737:chemistry / Q000627:therapeutic use*; D011092:Polyethylene Glycols / Q000737:chemistry / Q000627:therapeutic use*; D019946:Propylene Glycol / Q000737:chemistry / Q000627:therapeutic use*; D013501:Surface-Active Agents / Q000737:chemistry / Q000627:therapeutic use; D016896:Treatment Outcome; D014783:Viscosity
chemical_list: D004338:Drug Combinations; D009883:Ophthalmic Solutions; D014677:Pharmaceutical Vehicles; D013501:Surface-Active Agents; D011092:Polyethylene Glycols; D019946:Propylene Glycol; D002266:Carboxymethylcellulose Sodium