A Study on Corneal Properties Through Digital Holography
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In this work, double-wavelength holographic interferometry has been applied to measure shape and to be used as a corneal topographer for both synthetic and biological corneas. Holograms were recorded using pre-established setups, and from their analysis, a 2D map of the Z-position of all points on the outer surface was obtained over a field larger than the visible horizontal iris diameter, with a precision of 36 μm, representing a significant improvement over existing topographers. From the surface data, by means of a least-squares conic fit, we were able to calculate the radius of curvature. All these results were obtained independently of the sample’s specularity, in two synthetic corneas, a (transparent) contact lens, and two ex vivo rabbit corneas.