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Author: Shannon Cornell
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 130
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Book Description
Author: Shannon Cornell
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 130
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Book Description
Author: R. Collins
Publisher: Springer Science & Business Media
ISBN: 3642501532
Category : Mathematics
Languages : en
Pages : 111
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Book Description
A rich and abundant literature has developed during the last half century dealing with mechanical aspects of the eye, mainly from clinical and, experimental points of view. For the most part, workers have attempted to shed light on the complex set of conditions known by the general term glaucoma. These conditions are characterised by an increase in intraocular pressure sufficient to cause de generation of the optic disc and concomitant defects in the visual field, which, if not controlled, lead to inevitable permanent blindness. In the United States alone, an estimated 50,000 persons are blind as a result of glaucoma, which strikes about 2% of the population over 40 years of age (Vaughan and Asbury, 1974). An understanding of the underlying mechanisms of glaucoma is hindered by the fact that elevated intraocular pressure, like a runny nose, is but a symptom which may have a variety of causes. Only by turning to the initial pathology can one hope to understand this important class of medical problems.
Author: Richard Collins
Publisher:
ISBN:
Category :
Languages : de
Pages :
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Author: Pamela Lockwood-Cooke
Publisher:
ISBN:
Category : Binocular vision
Languages : en
Pages : 148
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Book Description
Author: Francine J. Prokoski
Publisher:
ISBN:
Category : Vision
Languages : en
Pages : 362
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Book Description
Author: James Lester Ross
Publisher:
ISBN:
Category :
Languages : en
Pages : 428
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Author: Venetia V. Chan
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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Book Description
A three-dimensional finite element model was created to analyze the mechanical interactions between the various substructures within the human eye. During certain activities, mechanical interactions may lead to a resultant distribution of stresses within the eye that may in turn produce various retinal diseases. The entire eye was modeled using dynamic finite element analysis to incorporate the mechanical effects of all of the substructures on the retina. A set of mechanical properties for each substructure was determined from previously published studies. Saccadic motion was modeled in the normal human eye to determine the location and magnitude of peak stresses in the retina and optic nerve head during initial loading. After 0.6125 ms, stresses as high as 5.4 x 107 Pa were reached. The peak stresses occurred in the portions of the retina and the optic nerve head close to the boundary between these two substructures.
Author: John W. McCloskey
Publisher:
ISBN:
Category :
Languages : en
Pages : 61
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Book Description
When the head is tilted to the side, the eyes rotate slightly in the opposite, compensatory, direction. This ocular counterrolling has been related to, and may provide a useful index of, otolith function. This report describes a technique for inducing and precisely recording ocular counterrolling. In normal subjects the eyes rotate as much as plus or minus 6 degrees depending on the amount, direction, and speed of head rotation around its X (fore and aft) axis. Counterrolling is maximum under static or low rotation-rate conditions. Labyrinthine-defective subjects exhibit little or no compensatory counterrolling. (Author).
Author: Luka Sterle
Publisher:
ISBN:
Category :
Languages : en
Pages : 85
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Book Description
Biomechanical properties of ocular tissues are assumed to play an important role in the pathogenesis of a variety of ocular diseases. This is particularly true for glaucoma, where the tissue biomechanics appears to determine which level of intraocular pressure can be tolerated in an individual eye. In the recent years several mathematical models were established and measurements of ocular biomechanical properties were obtained from in vitro and in vivo measurements. In this master thesis we developed finite element modeling of the human eye. New algorithms integrated all available data on ocular biomechanical properties, available at the Center of Medical Physics and Biomedical Engineering from interferometric measurements.
Author: Jia-Long Horng
Publisher:
ISBN:
Category :
Languages : en
Pages : 312
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Book Description
