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An interferometric ex vivo study of corneal biomechanics under physiologically representative loading,highlighting the role of the limbus in pressure compensation

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Eye and Vision 2020年第5期7卷 412-422页

作者： Abby Wilson john Jones john rtyrer john Marshall Wolfson School of Mechanical Manufacturing and Electrical EngineeringLoughborough UniversityLoughboroughUK Laser Optical Engineering Ltd. DerbyshireUK Institute of Ophthalmology UCLLondonUK

Background:The mechanical properties of the cornea are complex and regionally *** paper uses an original method to investigate the biomechanics of the cornea in response to hydrostatic loading over the typical physiological range of intra-ocular pressure(IOP)fluctuations thereby increasing understanding of clinically relevant corneal biomechanical properties and their contributions to the refractive properties of the ***:Displacement speckle pattern interferometry(DSPI)was used to measure the total surface displacement of 40 porcine and 6 human corneal-scleral specimens in response to pressure variations up to 1 mmHg from a baseline of 16.5 *** specimens were mounted in a modified artificial anterior chamber(AAC)and loaded *** of high strain in response to loading were identified by comparing the displacements across different ***:The nature of the response of the corneal surface to loading demonstrated high regional topographic *** properties were shown to be asymmetrical,and deformation of the limbal and pre-limbal regions dominated these responses respectively with over 90%(N-T)and 60%(S-I)of the total maximum displacement occurring in these regions indicating *** contrast,the curvature of the central cornea remained relatively unchanged merely translating in ***:The limbal and pre-limbal regions of the cornea appear to be fundamental to the absorption of small pressure fluctuations facilitating the curvature of the central cornea to remain relatively *** differential mechanical properties of this region could have important implications for the application of corneal surgery and corneal crosslinking,warranting further investigation.

关键词： Cornea Biomechanics Interferometry Limbus Topography

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