The purpose of this study was to develop a keratometric device that would give a peripheral corneal measurement approximately 3.0mm from the center of the cornea and to compare the accuracy of the peripheral keratometry readings to an industry standard, a computerized corneal topographer. The EyeSys Corneal Analysis System by EyeSys laboratories in Houston, Texas, was chosen as a representative of available computerized corneal topographers. A fixation device, with peripheral fixation targets was created and attached to a standard Bausch & Lomb keratometer. Thirty-one subjects (five in the initial phase and twenty-six in the final phase) who were free from corneal disease and were not contact lens wearers, were subjects for this study. Each subject had four keratometric readings per eye taken 3.0mm from the center of the cornea and compared to the same location on their topographic map. Ninety-one percent of all readings fell within ±0.500. The device may prove to be a useful tool to aid in the base curve selection when fitting RGP lenses on both normal and pathologic eyes (i.e. keratoconus, post-keratoplasty and post-refractive surgery).
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