Corneal Refractive Therapy has yielded fine results in correcting small to moderate myopia by redistributing corneal epithelial tissue. Currently there are two modalities to help the practitioner decide on his or her initial trial lens. The traditional trial lens slide rule calculator and the new Paragon CRT software for topographers were measured against one another in a retrospective study using twenty successful fits ( 40 eyes) with Paragon CRT. Overall depths of the trial lenses, as computed by both modalities, were compared to the overall depth of the final successful lens. The study found that the slide rule was slightly closer to the final lens depth. The significance of this finding is however small.
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