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Regional changes in the elastic properties of myopic Guinea pig sclera.


ABSTRACT: Biomechanical changes in the sclera likely underlie the excessive eye elongation of axial myopia. We studied the biomechanical characteristics of myopic sclera at the microscopic level using scanning acoustic microscopy (SAM) with 7-?m in-plane resolution. Guinea pigs underwent form-deprivation (FD) in one eye from 4 to 12 days of age to induce myopia, and 12-?m-thick scleral cryosections were scanned using a custom-made SAM. Two-dimensional maps of the bulk modulus (K) and mass density (?) were derived from the SAM data using a frequency-domain approach. We assessed the effect on K and ? exerted by: 1) level of induced myopia, 2) region (superior, inferior, nasal or temporal) and 3) eccentricity from the nerve using univariate and multivariate regression analyses. Induced myopia ranged between -3D and -9.3D (Mean intraocular difference of -6.2?±?1.7D, N?=?11). K decreased by 0.036?GPa for every 1.0 D increase in induced myopia across vertical sections (p?

SUBMITTER: Hoang QV 

PROVIDER: S-EPMC6712578 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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Regional changes in the elastic properties of myopic Guinea pig sclera.

Hoang Quan V QV   Rohrbach Daniel D   McFadden Sally A SA   Mamou Jonathan J  

Experimental eye research 20190719


Biomechanical changes in the sclera likely underlie the excessive eye elongation of axial myopia. We studied the biomechanical characteristics of myopic sclera at the microscopic level using scanning acoustic microscopy (SAM) with 7-μm in-plane resolution. Guinea pigs underwent form-deprivation (FD) in one eye from 4 to 12 days of age to induce myopia, and 12-μm-thick scleral cryosections were scanned using a custom-made SAM. Two-dimensional maps of the bulk modulus (K) and mass density (ρ) were  ...[more]

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