In Vivo Noninvasive Measurement of Young's Modulus of Elasticity in Human Eyes: A Feasibility Study

Abnormal ocular biomechanical properties may be important for understanding the risk of glaucoma. However, there are no clinical methods for measuring standard material properties in patients. In this feasibility study we demonstrated proof-of-principle for a novel method, ultrasound surface wave el...

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Vydáno v:Journal of glaucoma Ročník 26; číslo 11; s. 967
Hlavní autoři: Sit, Arthur J, Lin, Shuai-Chun, Kazemi, Arash, McLaren, Jay W, Pruet, Christopher M, Zhang, Xiaoming
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States 01.11.2017
Témata:
Adult
Biomechanical Phenomena
Cornea - physiology
Elastic Modulus - physiology
Elasticity - physiology
Elasticity Imaging Techniques - methods
Feasibility Studies
Female
Healthy Volunteers
Humans
Intraocular Pressure
Male
Middle Aged
Tonometry, Ocular
ISSN:1536-481X, 1536-481X
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Shrnutí:Abnormal ocular biomechanical properties may be important for understanding the risk of glaucoma. However, there are no clinical methods for measuring standard material properties in patients. In this feasibility study we demonstrated proof-of-principle for a novel method, ultrasound surface wave elastography (USWE), to determine the in vivo Young's modulus of elasticity of corneas in normal human eyes. In total, 20 eyes of 10 healthy subjects (mean age, 51.4±7.2; ±SD; range, 43 to 64 y) were studied. A spherical-tipped probe (3-mm diameter) was placed on closed eyelids and generated a gentle harmonic vibration at 100 Hz for 0.1 second. Wave speed propagation in the cornea was measured by USWE, and Young's modulus was calculated from the wave speed. Associations between Young's modulus and intraocular pressure (IOP), age, central corneal thickness, and axial length were explored by the Pearson correlation. Statistical significance was determined by using generalized estimating equation models to account for possible correlation between fellow eyes. Mean IOP was 12.8±2.7 mm Hg. Mean wave speed in the cornea was 1.82±0.10 m/s. Young's modulus of elasticity was 696±113 kPa and was correlated with IOP (r=0.57; P=0.004), but none of the other variables (P>0.1). USWE is a novel noninvasive technique for measuring ocular biomechanical properties. Corneal Young's modulus in normal eyes is associated with IOP, consistent with measurements in cadaver eyes. Further work is needed to determine elasticity in other ocular tissues, particularly the sclera, and if elasticity is altered in glaucoma patients.
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ISSN:1536-481X
1536-481X
DOI:10.1097/IJG.0000000000000774