title: Diagnostic bitoric rigid gas permeable contact lenses.
abstract: OBJECTIVE
  To simplify the fitting of bitoric rigid gas permeable (RGP) contact lenses.
  
  
  METHODS
  We prescribed bitoric RGP lenses using two kinds of diagnostic lenses at random. One type of lens was a diagnostic polymethylmethacrylate (PMMA) spherical lens and the other was a diagnostic RGP bitoric lens.
  
  
  RESULTS
  The bitoric RGP lenses that were prescribed using a diagnostic bitoric lens required fewer parameter changes compared with the bitoric RGP lens prescribed using a diagnostic PMMA spherical lens.
  
  
  CONCLUSIONS
  The diagnostic RGP bitoric lens simplifies the prescription of bitoric RGP lenses and is very useful in fitting astigmatic corneas.
authors.affiliation: Department of Ophthalmology, Fukushima Medical University, School of Medicine, Fukushima-ken, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kajita
authors.forename: S
authors.initials: S
authors.lastname: Ito
authors.forename: A
authors.initials: A
authors.lastname: Yamada
authors.forename: Y
authors.initials: Y
authors.lastname: Ito
authors.forename: K
authors.initials: K
authors.lastname: Kato
mesh_terms: D000293:Adolescent; D000328:Adult; D001251:Astigmatism / Q000628:therapy*; D003261:Contact Lenses; D005139:Eyeglasses; D006801:Humans; D019904:Polymethyl Methacrylate; D017755:Prosthesis Fitting / Q000379:methods*; D014792:Visual Acuity
chemical_list: D019904:Polymethyl Methacrylate