Consensus on recording of gas permeable contact lens fit

James S. Wolffsohn*, Eef van der Worp, John de Brabander,

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Purpose: To develop a new schematic scheme for efficiently recording the key parameters of gas permeable contact lens (GP) fits based on current consensus. Methods: Over 100 established GP fitters and educators met to discuss the parameters proposed in educational material for evaluating GP fit and concluded on the key parameters that should be recorded. The accuracy and variability of evaluating the fluorescein pattern of GP fit was determined by having 35 experienced contact lens practitioners from across the world, grading 5 images of a range of fits and the topographer simulation of the same fits, in random, order using the proposed scheme. The accuracy of the grading was compared to objective image analysis of the fluorescein intensity of the same images. Results: The key information to record to adequately describe the fit of an GP was agreed as: the manufacturer, brand and lens parameters; settling time; comfort on a 5 point scale; centration; movement on blink on a ±2 scale; and the Primary Fluorescein Pattern in the central, mid-peripheral and edge regions of the lens averaged along the horizontal and vertical lens axes, on a ±2 scale. On average 50-60% of practitioners selected the median grade when subjectively rating fluorescein intensity and this was correlated to objective quantification (r= 0.602, p< 0.001). Objective grading suggesting horizontal median fluorescein intensity was generally symmetrical, as was the vertical meridian, but this was not the case for subjective grading. Simulated fluorescein patterns were subjectively and objectively graded as being less intense than real photographs (p< 0.01). Conclusion: GP fit recording can be standardised and simplified to enhance GP practice. © 2013 British Contact Lens Association.

Original languageEnglish
Pages (from-to)299-303
Number of pages5
JournalContact Lens and Anterior Eye
Issue number6
Early online date26 Mar 2013
Publication statusPublished - Dec 2013

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Contact lens and anterior eye. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Wolffsohn, J. S., van der Worp, E., de Brabander, J., & GP Consensus Group. Consensus on recording of gas permeable contact lens fit. Contact lens and anterior eye, In Press, correct proof (2013) DOI 10.1016/j.clae.2013.02.003


  • fitting characteristics
  • fluorescein pattern observation
  • lens evaluation
  • record keeping
  • rigid gas permeable contact lenses (RGP)


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