Stiffness characterization of anisotropic trabecular meshwork.

Area of Science:

• Biomedical Engineering
• Ocular Biomechanics
• Glaucoma Research

Background:

• Intraocular pressure (IOP) elevation in glaucoma is linked to trabecular meshwork (TM) stiffness changes.
• Quantitative mechanical properties of the TM are not well-established.
• Existing data suggest TM is not a uniform isotropic material, with Young's modulus varying widely.

Purpose of the Study:

• To develop a theoretical framework for analyzing TM mechanical properties.
• To explain discrepancies in reported TM stiffness values.
• To investigate the anisotropic behavior of the TM.

Main Methods:

• Proposed a new theoretical model for TM mechanical analysis.
• Modeled the inner wall of Schlemm's canal and juxtacanalicular tissue as isotropic.
• Modeled uveal and corneoscleral meshworks as transversely isotropic material.

Main Results:

• Demonstrated that TM anisotropy can explain the wide range of reported Young's moduli.
• Showed the meshwork is significantly stiffer longitudinally than transversely.
• Identified anisotropy as a key factor in TM mechanical properties.

Conclusions:

• The developed theoretical framework can integrate existing TM stiffness data.
• It facilitates the investigation of anisotropic behaviors in ocular tissues.
• The framework can aid in developing novel methods for measuring TM mechanical properties.