Abstract
.Significance: Mechanical assessment of the cornea can provide important structural and functional information regarding its health. Current clinically available tools are limited in their efficacy at measuring corneal mechanical properties. Elastography allows for the direct estimation of mechanical properties of tissues in vivo but is generally performed using external excitation force.Aim: To show that heartbeat optical coherence elastography (Hb-OCE) can be used to assess the mechanical properties of the cornea in vivo.Approach: Hb-OCE was utilized to detect Hb-induced deformations in the rabbit cornea in vivo without the need for external excitation. Furthermore, we demonstrate how this technique can distinguish corneal stiffness between untreated (UT) and crosslinked (CXL) tissue.Results: Our results demonstrate that stiffness changes in the cornea can be detected using only the Hb-induced deformations in the cornea. Additionally, we demonstrate a statistically significant difference in strain between the UT and CXL corneas.Conclusions: Hb-OCE may be an effective tool for assessing the mechanical properties of the cornea in vivo without the need for external excitation. This tool may be effective for clinical assessment of corneal mechanical properties because it only requires optical coherence tomography imaging and data processing.
Highlights
The cornea is an essential component of vision, and various pathologies, such as keratoconus and corneal ectasia, can affect its structural integrity and biomechanical properties.[1,2] One emerging method for assessing these biomechanical changes in corneal tissue is utilizing noncontact tonometry, such as with the CorVis ST (OCULUS Optikgerate GmbH, Germany) and ORA (Reichert Technologies)
heartbeat optical coherence elastography (Hb-optical coherence elastography (OCE)) may be an effective tool for assessing the mechanical properties of the cornea in vivo without the need for external excitation
This tool may be effective for clinical assessment of corneal mechanical properties because it only requires optical coherence tomography imaging and data processing
Summary
The cornea is an essential component of vision, and various pathologies, such as keratoconus and corneal ectasia, can affect its structural integrity and biomechanical properties.[1,2] One emerging method for assessing these biomechanical changes in corneal tissue is utilizing noncontact tonometry, such as with the CorVis ST (OCULUS Optikgerate GmbH, Germany) and ORA (Reichert Technologies). While these tools are useful in the clinic, separating the effects of stiffness, intraocular pressure (IOP), and corneal geometry with these devices is a complex problem that is still under investigation.[3,4,5,6,7].
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