Emerging technologies for refractive surgery, such as photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK), require an accurate, repeatable, user friendly means of measuring the shape of the cornea for both elevation and refractive properties. Such measurements are used for pre operative surgical planning and simulation, post operative assessment and documentation of surgical effects, and post operative monitoring of corneal shape changes which occur during the healing process. The PAR pilot Corneal Topography System (CTS) demonstrates the feasibility of a new corneal topography technology using stereographic grid projection and rasterstereography; however, its utility in refractive surgery could be better established by improvements in accuracy, repeatability and ease of use, and the addition of capabilities for defining corneal landmarks (such as the pupil outline). Accuracy and repeatability are especially important, due to the high precision employed by excimer lasers in reshaping the cornea. Phase II will design, develop, and produce a Corneal Topography System that includes: improved accuracy and repeatability; automatic alignment and focus capabilities; and automatic pupil delineation and display.
Keywords: 3-D MATCHED FILTERING RASTERSTEREOGRAPHY REFRACTIVE SURGERY IMAGE PROCESSING CORNEAL TOPOGRAPHY STER
