title: Comparison of carboxymethylcellulose vs. hydroxypropyl methylcellulose as a gonioscopic fluid.
abstract: BACKGROUND
  Hydroxypropyl methylcellulose (HPMC), a popular gonioscopic solution, can cause discomfort and blurred vision. These side effects have been attributed to the preservative benzalkonium chloride (BAK). Carboxymethylcellulose (CMC), an unpreserved, viscous solution, might well provide adequate patient comfort and cushioning during gonioscopy without producing blur or irritation.
  
  
  METHODS
  The effects of CMC and HPMC during gonioscopy were evaluated in 55 human subjects. Corneal staining, comfort, subjective vision, and measured visual acuity (VA) were assessed.
  
  
  RESULTS
  In comparison with HPMC, CMC effected less corneal staining, greater comfort, and better vision after the procedure,
  
  
  CONCLUSIONS
  CMC proved to be a viable and superior alternative to HPMC as a gonioscopic solution.
authors.affiliation: Southern California College of Optometry, Fullerton, USA.
authors.forename: T P
authors.initials: TP
authors.lastname: Nguyen
authors.forename: J H
authors.initials: JH
authors.lastname: Nishimoto
authors.forename: C Y
authors.initials: CY
authors.lastname: Nakamura
authors.forename: P N
authors.initials: PN
authors.lastname: De Land
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000033:anatomy & histology*; D002266:Carboxymethylcellulose Sodium / Q000009:adverse effects; D003315:Cornea / Q000502:physiology; D004311:Double-Blind Method; D006068:Gonioscopy / Q000379:methods*; D006801:Humans; D065347:Hypromellose Derivatives; D008747:Methylcellulose / Q000009:adverse effects / Q000031:analogs & derivatives*; D009883:Ophthalmic Solutions; D014785:Vision, Ocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology
chemical_list: D009883:Ophthalmic Solutions; D065347:Hypromellose Derivatives; D008747:Methylcellulose; D002266:Carboxymethylcellulose Sodium