Study of Laser-Induced Microdeformations of the Cornea Using Phase-Sensitive Optical Coherent Elastography

Ekaterina M. Kasianenko (Login required)
Institute of Photon Technologies, Federal Scientific Research Center “Crystallography and Photonics”, Russian Academy of Sciences, Troitsk, Moscow, Russia

Anastasia V. Golovchenko
Department of Ophthalmology, I. M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia

Vladimir I. Siplivyi
Department of Ophthalmology, I. M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia

Oleg G. Romanov
Belarusian State University, Minsk, Belarus
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus

Olga I. Baum
Institute of Photon Technologies, Federal Scientific Research Center “Crystallography and Photonics”, Russian Academy of Sciences, Troitsk, Moscow, Russia


Paper #3488 received 16 Mar 2022; revised manuscript received 27 Apr 2022; accepted for publication 02 May 2022; published online 20 May 2022.

DOI: 10.18287/JBPE22.08.020305

Abstract

In many clinical cases, knowledge of the biomechanical properties of the cornea will allow for early diagnosis and also contribute to the success of treatment. The methods existing in the clinic characterize the biomechanical properties of the cornea as a whole, but do not give an idea of its local properties. One of the promising approaches to measure local changes in biomechanics is optical coherence elastography (OCE) based on 
phase-sensitive optical coherence tomography (OCT). In this work, the OCE method, based on the registration of small tissue deformations under an applied load, showed that the appearance and propagation of mechanical waves due to laser exposure depend on the loading of the studied biological tissue due to its tension with the application of various intraocular pressures (IOP). An analysis of inter-frame differential OCT images showed that the width of the laser impact zone on the tissue increases with increasing of IOP. An analysis of the strain amplitudes depending on the IOP at a given point revealed a correlation with the IOP value and made it possible to fix the fluidity threshold for the sample under consideration in the given experimental geometry.

Keywords

intraocular pressure; phase-sensitive optical coherent elastography; cornea; keratoconus; biomechanics

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