Assessing corneal cross-linking with reverberant 3D optical coherence elastography

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Biophysics

Background:

• Corneal cross-linking (CXL) treats eye disorders like keratoconus, but its biomechanical effects on corneal layers require detailed study.
• Current methods lack high-resolution characterization of individual corneal layer responses to CXL.

Purpose of the Study:

• To develop and validate a high-resolution elastography method for assessing biomechanical changes in individual corneal layers post-CXL.
• To differentiate the effects of low-dose and high-dose CXL treatments on corneal elasticity.

Main Methods:

• Application of a reverberant shear wave elastography technique combined with optical coherence tomography (OCT).
• Ex vivo analysis of pig corneas subjected to low-dose and high-dose CXL treatments.
• Pre- and post-treatment evaluation of elasticity changes in distinct corneal layers.

Main Results:

• The reverberant 3D OCE technique successfully identified increased corneal elasticity following both low-dose and high-dose CXL.
• Distinct graphical differences were observed between low-dose and high-dose CXL treatments.
• The method pinpointed specific corneal layers affected by CXL and revealed nonlinear elasticity changes.

Conclusions:

• Reverberant 3D OCE provides depth-resolved elasticity measurements of the cornea after CXL.
• This technique offers a promising approach for assessing and monitoring CXL treatment efficacy in clinical settings.