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Deformation of the lamina cribrosa and optic nerve due to changes in cerebrospinal fluid pressure

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posted on 2018-01-05, 11:40 authored by Andrew J. Feola, Baptiste Coudrillier, John J.E. Mulvihill, Diogo M. Geraldes, Nghia T. Vo, Julie Albon, Richard L. Abel, Brian C. Samuels, C. Ross Ethier
PURPOSE. Cerebrospinal fluid pressure (CSFp) changes are involved or implicated in various ocular conditions including glaucoma, idiopathic intracranial hypertension, and visual impairment and intracranial pressure syndrome. However, little is known about the effects of CSFp on lamina cribrosa and retrolaminar neural tissue (RLNT) biomechanics, potentially important in these conditions. Our goal was to use an experimental approach to visualize and quantify the deformation of these tissues as CSFp increased. METHODS. The posterior eye and RLNT of porcine eyes (n ¼ 3) were imaged using synchrotron radiation phase-contrast micro-computed tomography (PC lCT) at an intraocular pressure of 15 mm Hg and CSFps of 4, 10, 20, and 30 mm Hg. Scans of each tissue region were acquired at each CSFp step and analyzed using digital volume correlation to determine 3-dimensional tissue deformations. RESULTS. Elevating CSFp increased the strain in the lamina cribrosa and RLNT of all three specimens, with the largest strains occurring in the RLNT. Relative to the baseline CSFp of 4 mm Hg, at 30 mm Hg, the lamina cribrosa experienced a mean first and third principal strain of 4.4% and 3.5%, respectively. The corresponding values for the RLNT were 9.5% and 9.1%. CONCLUSIONS. CSFp has a significant impact on the strain distributions within the lamina cribrosa and, more prominently, within the RLNT. Elevations in CSFp were positively correlated with increasing deformations in each region and may play a role in ocular pathologies linked to changes in CSFp.

Funding

Est1C Regulation of the p53 Pathway in Stress Response

National Institute of General Medical Sciences

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History

Publication

Investigative Ophthalmology & Visual Science;58 (4), pp. 2070-2078

Publisher

Association for Research in Vision and Ophthalmology

Note

peer-reviewed

Other Funding information

Science and Technology Facilities Council, Georgia Research Alliance, National Aeronautics and Space Administration

Language

English

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