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Abstract
SA.01.08
Ocular rigidity. Biomechanical aspects and clinical applications
Konstantin Kotliar1, Ivan Koshits2, Chris P. Lohmann1, Mathias Maier1, Ines Lanzl1
1Augenklinik, Klinikum rechts der Isar, Technische Universität München, München, 2Petercom/MS Consulting Group.Ltd, St.Petersburg, Russland
The term ocular rigidity is widely used in ophthalmology. Generally it is assumed as a measurable physical parameter related to biomechanical properties of the whole eye globe. Formulas for clinical tonometry and tonography methods include the concept of ocular rigidity. There is evidence for altered ocular rigidity in aging and in eye diseases. Unfortunately, there is no consensual view on ocular rigidity in ophthalmology. It has different meanings for different people but the same name. A number of formulas for ocular rigidity have been developed. The most of them are based on the discrete or continuous tonometric measurements in living or enucleated human eyes. In experimental and clinical studies ocular rigidity is measured in various units. Besides, there is no clear consent between biomechanical engineers and ophthalmologists on the concept of ocular rigidity. In biomechanics parameters for the elasticity and viscoelasticity are accepted, which represent mechanical properties of a tissue and can consider its morphology. These are for example: Young’s modules of the sclera, blood shear rates, Poisson’s ratios of the cornea etc. Ophthalmological concepts on ocular rigidity clime to describe the total state of the eye without any detailed considerations on its morphologic and material properties. A proposed review considers ocular rigidity from both biomechanical and clinical points of view with the aim to straighten out this concept and to show its various clinical applications. |
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