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Leo K. K. Leung, Match W. L. Ko, Cong Ye, David C. C. Lam, Christopher K. S. Leung; Noninvasive Measurement of Scleral Stiffness and Tangent Modulus in Porcine Eyes. Invest. Ophthalmol. Vis. Sci. 2014;55(6):3721-3726. doi: 10.1167/iovs.13-13674.
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We investigated an indentation technique to measure the scleral stiffness and tangent modulus of porcine eyes.
The scleral load-displacement responses were measured with a universal testing machine as a function of IOP in 15 porcine eyes ex vivo using a 5-mm diameter cylindrical flat-punch indenter. The scleral radius of curvature and scleral thickness were measured using a DSLR camera (Alpha 900) and a camera-mounted stereomicroscope (M205C), respectively. The relationships between scleral stiffness, tangent modulus, and IOP were examined.
The mean local scleral radius of curvature and scleral thickness were 7.86 ± 0.49 and 1.03 ± 0.14 mm, respectively. The average scleral stiffness and scleral tangent modulus of porcine eyes were 0.13 ± 0.02 N/mm and 0.20 ± 0.04 MPa at 15 mm Hg, respectively. The scleral stiffness and scleral tangent modulus were correlated positively with IOP (scleral stiffness, 0.989 < r < 0.999, P < 0.001; scleral tangent modulus, 0.989 < r < 0.999, P < 0.001).
The scleral indentation technique can provide a noninvasive approach to measure scleral stiffness and tangent modulus.
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