<title>Analysis of holographic interferograms of the expanded cornea after refractive surgery procedure</title>

Abstract

The paper presents results of holographic experiments of expanding bovine cornea in vitro, after different refractive surgery procedure (keratoplasty). The corneas of fresh, enucleated bovine eyes were subjected to different refractive procedures, such as: radial and tangential incisions, mechanical ablation of the corneal layers as well as ablation by means of excimer laser. After keratoplasty, the eyeball was placed into the holographic set-up and the needle connected to a pressure meter was inserted into the anterior chamber of the eye. Double exposure, as well as real time holographic interferograms of expanding corneas were recorded by means of photothermoplastic camera, due to small intraocular pressure differences in order of a few Pa. The holographic interferograms were stored and processed in the computer memory by use of CCD camera and the image processing board. Quantitative results are presented in the form of a 3-D surface plot of the displacement vectors of the corneal surface and respective changes of the corneal curvature.