Tear film topography using radial shear interferometry
A. Dubra*+, C. Paterson*, B. Barry+ and J.C. Dainty+
*
Imperial College London
+ National University of Ireland Galway
We are currently exploring the possibility of using radial shear interferometry to evaluate the topography of human tear film topography. Radial shear interferometry could allow for the estimation of tear topography maps with only one interferogram, reducing the pupil alignment and/or scaling required when using lateral shear interferometry, in which two interferograms with shear in different directions are required.
Figure 1: Recorded series of radial shear interferograms from tear film topography. The experimental setup was a Mach-Zender type configuration in which one of the imaging branches was defocused with respect to the other. Notice that the large amplitude of the relative pupil movement can make the quantitative analysis of the data very difficult. |
