[Determination of glucose diffusion coefficient in the human eye sclera]

Area of Science:

• Biomedical Optics
• Ocular Biomechanics
• Diffusion Science

Context:

• Understanding solute transport in ocular tissues is vital for developing effective drug delivery systems and managing ocular diseases.
• The human sclera, a key component of the eye, presents unique challenges for molecular diffusion due to its complex structure.
• In vitro studies offer a controlled environment to investigate fundamental transport processes within scleral tissue.

Purpose:

• To quantify the diffusion coefficients of aqueous glucose solutions within human sclera.
• To establish a method for measuring interstitial fluid dynamics in scleral tissue using collimated transmittance.
• To develop and validate a diffusion model for describing fluid replacement in the sclera.

Summary:

• Diffusion coefficients for glucose in human sclera were determined using in vitro measurements of collimated transmittance.
• The method correlates changes in light transmittance with the refractive index matching between scleral scatterers and interstitial fluid.
• A diffusion model assuming a constant diffusion coefficient was employed to analyze the dynamics of interstitial fluid replacement.

Impact:

• Provides essential quantitative data on glucose diffusion in the sclera, informing ocular drug delivery strategies.
• The developed optical method offers a non-invasive approach to study transport phenomena in ocular tissues.
• Contributes to a deeper understanding of the physical and chemical processes governing solute exchange in the cornea and sclera.