Standardized rigid contact lens fitting protocol for keratoconus

Timothy B. Edrington, Joseph T. Barr, Karla Zadnik, Larry J. Davis, Ralph E. Gundel, David P. Libassi, Timothy T. McMahon, Mae O. Gordon

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


Keratoconus is typically managed by a variety of rigid contact lens fitting techniques and lens designs. The two most fundamental fitting techniques are apical corneal touch (including divided or three-point touch) and apical clearance. In the course of designing a multi-center study of keratoconus patients, a standardized keratoconus fitting protocol was developed. All contact lens parameter options are uniform except for base curve and secondary curve radii, which are determined by interpretation of fluorescein patterns using the CLEK Study trial lens set and protocol. The initial trial lens's base curve is the average karatometric reading; sequentially steeper lenses are applied until definite apical clearance is observed. We have evaluated the feasibility of this standardized fitting protocol on 30 keratoconus patients. Our results suggest that we have developed a standardized contact lens fitting set and fitting protocol to simplify contact lens management in patients with mild to moderate keratoconus.

Original languageEnglish
Pages (from-to)369-375
Number of pages7
JournalOptometry and Vision Science
Issue number6
StatePublished - Jun 1996


  • RGP contact lens
  • contact lens fitting
  • cornea
  • keratoconus


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