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Effects of Peripapillary Scleral Stiffening on the Deformation of the Lamina Cribrosa

DOI: 10.1167/iovs.15-18193 DOI Help

Authors: Baptiste Coudrillier (Georgia Institute of Technology and Emory University,) , Ian C. Campbell (Georgia Institute of Technology and Emory University) , A. Thomas Read , Diogo M. Geraldes (Department of Mechanical Engineering, Imperial College London) , Nghia Vo (Diamond Light Source) , Andrew Feola (Georgia Institute of Technology) , John Mulvihill (Georgia Institute of Technology) , Julie Albon (Cardiff University) , Richard L. Abel (Department of Surgery and Cancer, Imperial College) , C. Ross Ethier (Georgia Institute of Technology and Emory University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Investigative Ophthalmology & Visual Science , VOL 57

State: Published (Approved)
Published: May 2016
Diamond Proposal Number(s): 8491

Open Access Open Access

Abstract: Purpose: Scleral stiffening has been proposed as a treatment for glaucoma to protect the lamina cribrosa (LC) from excessive intraocular pressure–induced deformation. Here we experimentally evaluated the effects of moderate stiffening of the peripapillary sclera on the deformation of the LC. Methods: An annular sponge, saturated with 1.25% glutaraldehyde, was applied to the external surface of the peripapillary sclera for 5 minutes to stiffen the sclera. Tissue deformation was quantified in two groups of porcine eyes, using digital image correlation (DIC) or computed tomography imaging and digital volume correlation (DVC). In group A (n = 14), eyes were subjected to inflation testing before and after scleral stiffening. Digital image correlation was used to measure scleral deformation and quantify the magnitude of scleral stiffening. In group B (n = 5), the optic nerve head region was imaged using synchrotron radiation phase-contrast microcomputed tomography (PC μCT) at an isotropic spatial resolution of 3.2 μm. Digital volume correlation was used to compute the full-field three-dimensional deformation within the LC and evaluate the effects of peripapillary scleral cross-linking on LC biomechanics. Results: On average, scleral treatment with glutaraldehyde caused a 34 ± 14% stiffening of the peripapillary sclera measured at 17 mm Hg and a 47 ± 12% decrease in the maximum tensile strain in the LC measured at 15 mm Hg. The reduction in LC strains was not due to cross-linking of the LC. Conclusions: Peripapillary scleral stiffening is effective at reducing the magnitude of biomechanical strains within the LC. Its potential and future utilization in glaucoma axonal neuroprotection requires further investigation.

Subject Areas: Medicine, Biology and Bio-materials

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Added On: 20/06/2016 13:43

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