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Thesis

Assessing the effectiveness of fitting paragon CRT lenses with the aid of Humphrey's corneal atlas topographer versus the slide rule method

1 May 2005

Abstract

Two different procedures involved in the proper fitting of orthokeratology lenses were compared to one another to assess whether one technique was superior overall in determining the fit and function of the contact lens. The two procedures compared were the use of Paragon CRT software with the Humphrey's Corneal Atlas Topographer versus the use of the Slide Rule Method (SRM). The parameters used to determine superior fit and function included the evaluation of centration, treatment zone, edge lift, and lens movement as determined by each technique. These evaluations were then combined to tabulate a final score for each fitting technique. The CRT software method was awarded a superior total fit score one-third of the time, the slide rule method was awarded a superior total fit score one-third of the time, and the two methods were awarded an equal total fit score one-third of the time. The results of the study showed that neither technique was overall superior to the other in its ability to ascertain a best fit lens for the patient.


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