Abstract
Background: Graphical display of the many thousands of data points generated by corneal topography systems has progressed from three-dimensional wire representations, through curvature and power maps, to three-dimensional subtraction models. Standard colour-coded corneal ‘topographic’ maps may be misinterpreted as representing corneal profile instead of a form of corneal power. A variety of two- and three-dimensional output methods for displaying corneal topography data are demonstrated. Method: Axial colour-coded isodioptric maps were obtained with the MasterVue Ultra corneal topography system. Separate software was written to access the data files to enable construction of alternative display forms, that is, instantaneous power maps and various colour-coded three-dimensional models. Results: The relative advantages and disadvantages of various methods for viewing corneal topography measurements are demonstrated for data taken from the clinical records of two subjects. Conclusion: Newer methods for displaying corneal topography data enable the visualisation of the differences between representations of power and those of profile. The different display methods have their own advantages and limitations which make them more appropriate in certain applications and less so in others.
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