The ability to perform multi-meridian, simultaneous OCT measurements of air-induced corneal deformation is expected to highly improve the accuracy of assessing corneal biomechanics. We propose a simplified method targeting 3-D deformation measurement that could be introduced to swept-source OCT systems. We utilize a spatial-depth-encoded multiplexing to provide a 9-spot measurement of the deformation. The method is promising for the assessment of corneal asymmetries and diagnosis of corneal pathologies such as keratoconus. We present in detail the system and key requirements to provide simultaneous 9-spot deformation measurement. Finally, results on porcine eyes ex vivo and human eye in vivo are presented.
Image artifacts due to the bulk motion of the sample are well known and described. Some methods of correction in Full-Filed Swept-Source OCT were presented. For the measurement of dynamic sample motion, the axial motion artifacts can significantly influence measured signals. Here, we investigate the axial shift phenomena for measurements with low cost, reduced speed swept laser. Simulation results have led us to the way of correction of the axial shift artifact by manipulation of the phase of OCT fringes. Results of disturbed and undisturbed measurement of vibrating speaker membrane or induced deformations of the porcine eye are presented.
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