Author: Kehao Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Finite Element Modelling of Human Eye Lens
Author: Kehao Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Finite Element Modeling of the Human Eye
Author: Venetia V. Chan
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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.
Finite Element Modelling as a Predictor of Soft Contact Lens Performance on the Eye
Author: Geoffrey Brent
Publisher:
ISBN:
Category : Finite element method
Languages : en
Pages : 392
Book Description
Publisher:
ISBN:
Category : Finite element method
Languages : en
Pages : 392
Book Description
Image Modeling of the Human Eye
Author: Rajendra Acharya U
Publisher: Artech House
ISBN: 1596932090
Category : Computers
Languages : en
Pages : 378
Book Description
This groundbreaking resource gives you full details on state-of-the-art 2D and 3D eye imaging and modeling techniques that are paving the way to breakthrough clinical applications in eye health. ItOCOs the first book to explore in depth a new generation of computational methods that combine image processing, simulation, and statistical discrimination tools in efforts to improve early detection of cataracts, diabetic retinopathy, glaucoma, iridocyclitis, corneal haze, maculopathy, and other visual impairments and conditions."
Publisher: Artech House
ISBN: 1596932090
Category : Computers
Languages : en
Pages : 378
Book Description
This groundbreaking resource gives you full details on state-of-the-art 2D and 3D eye imaging and modeling techniques that are paving the way to breakthrough clinical applications in eye health. ItOCOs the first book to explore in depth a new generation of computational methods that combine image processing, simulation, and statistical discrimination tools in efforts to improve early detection of cataracts, diabetic retinopathy, glaucoma, iridocyclitis, corneal haze, maculopathy, and other visual impairments and conditions."
Human Eye Imaging and Modeling
Author: E. Y. K. Ng
Publisher: CRC Press
ISBN: 1439869936
Category : Technology & Engineering
Languages : en
Pages : 432
Book Description
Advanced image processing and mathematical modeling techniques are increasingly being used for the early diagnosis of eye diseases. A comprehensive review of the field, Human Eye Imaging and Modeling details the latest advances and analytical techniques in ocular imaging and modeling. The first part of the book looks at imaging of the fundus as well as infrared imaging. It begins by exploring developments in the analysis of fundus images, particularly for the diagnosis of diabetic retinopathy and glaucoma. It also reviews anterior segment imaging and reports on developments in ocular thermography, especially the use of thermal imaging as the basis of tear evaporimetry and dry eye diagnosis. The second part of the book delves into mathematical modeling of the human eye. Coverage includes modeling of the eye during retinal laser surgery, a framework for optical simulation, heat distribution using a 3D web-splines solution, and exposure to laser radiation. The text also examines computer simulation of the human eye based on principles of heat transfer, as well as various bioheat equations to predict interior temperatures based on the surface temperature. Featuring contributions by established experts in eye imaging, this is a valuable reference for medical personnel and researchers who want to know more about state-of-the-art computer-based imaging and detection methods. It presents novel imaging and modeling algorithms that can aid in early diagnosis, with the aim of enriching the lives of people suffering from eye abnormalities.
Publisher: CRC Press
ISBN: 1439869936
Category : Technology & Engineering
Languages : en
Pages : 432
Book Description
Advanced image processing and mathematical modeling techniques are increasingly being used for the early diagnosis of eye diseases. A comprehensive review of the field, Human Eye Imaging and Modeling details the latest advances and analytical techniques in ocular imaging and modeling. The first part of the book looks at imaging of the fundus as well as infrared imaging. It begins by exploring developments in the analysis of fundus images, particularly for the diagnosis of diabetic retinopathy and glaucoma. It also reviews anterior segment imaging and reports on developments in ocular thermography, especially the use of thermal imaging as the basis of tear evaporimetry and dry eye diagnosis. The second part of the book delves into mathematical modeling of the human eye. Coverage includes modeling of the eye during retinal laser surgery, a framework for optical simulation, heat distribution using a 3D web-splines solution, and exposure to laser radiation. The text also examines computer simulation of the human eye based on principles of heat transfer, as well as various bioheat equations to predict interior temperatures based on the surface temperature. Featuring contributions by established experts in eye imaging, this is a valuable reference for medical personnel and researchers who want to know more about state-of-the-art computer-based imaging and detection methods. It presents novel imaging and modeling algorithms that can aid in early diagnosis, with the aim of enriching the lives of people suffering from eye abnormalities.
A Finite Element Model to Predict the Dynamic Behavior of the Human Eye
Author: Luka Sterle
Publisher:
ISBN:
Category :
Languages : en
Pages : 85
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.
Publisher:
ISBN:
Category :
Languages : en
Pages : 85
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.
A Whole Eye Finite Element Analysis of Accommodation
Author: Robert Peyton Wilkes
Publisher:
ISBN: 9781321475203
Category :
Languages : en
Pages : 133
Book Description
The young human eye has the ability to change focus from far to near distance by changing the shape of the lens in a process called accommodation. Contraction of the ciliary muscle drives accommodation. Hypothetically it also plays a mechanical role in the etiology of glaucoma and presbyopia. Biomechanical assessment of the associated tissues has been done primarily with tissue samples in isolation after dissection, or through optometric measurements. The ciliary muscle has been inaccessible without dissection, except with various imaging modalities, including UBM OCT and MRI. However, it has not been well characterized in terms of its contraction kinetics. To address this gap in knowledge a biomechanical finite element analysis (FEA) model was built of the entire globe of the eye that includes the tissue components in the loading pathway of accommodative forces, and with an active ciliary muscle. This time-based model, consisting of discrete 3D geometric regions for each tissue, was populated with tissue material models from literature, and calibrated based on reported measurements of tissue movement from the clinical literature. It is hoped that the knowledge and modeling tools from this work will provide a platform for future study of pathologies associated with accommodation.
Publisher:
ISBN: 9781321475203
Category :
Languages : en
Pages : 133
Book Description
The young human eye has the ability to change focus from far to near distance by changing the shape of the lens in a process called accommodation. Contraction of the ciliary muscle drives accommodation. Hypothetically it also plays a mechanical role in the etiology of glaucoma and presbyopia. Biomechanical assessment of the associated tissues has been done primarily with tissue samples in isolation after dissection, or through optometric measurements. The ciliary muscle has been inaccessible without dissection, except with various imaging modalities, including UBM OCT and MRI. However, it has not been well characterized in terms of its contraction kinetics. To address this gap in knowledge a biomechanical finite element analysis (FEA) model was built of the entire globe of the eye that includes the tissue components in the loading pathway of accommodative forces, and with an active ciliary muscle. This time-based model, consisting of discrete 3D geometric regions for each tissue, was populated with tissue material models from literature, and calibrated based on reported measurements of tissue movement from the clinical literature. It is hoped that the knowledge and modeling tools from this work will provide a platform for future study of pathologies associated with accommodation.
The Mechanics of a Hydrogel Contact Lens on the Human Eye with a Lubricating Tear Layer
Author: Kevin Douglas Day
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
Book Description
A Study of Aberrations in the Human Eye by Zernike Phase Plate Precompensation and Finite Element Modeling Methods
Author: Hongwei Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 168
Book Description
Biomechanics of the Eye
Author: Cynthia J. Roberts
Publisher: Kugler Publications
ISBN: 9062998860
Category : Medical
Languages : en
Pages : 546
Book Description
Covering all major components of the ocular system, this state-of-the-art text is essential for vision scientists, biomedical engineers, and advanced clinicians with an interest in the role of mechanics in ocular function, disease, therapeutics, and surgery. With every chapter, leading experts strengthen the arguments that biomechanics is an indispensable and rapidly evolving tool for understanding and managing ocular disease.
Publisher: Kugler Publications
ISBN: 9062998860
Category : Medical
Languages : en
Pages : 546
Book Description
Covering all major components of the ocular system, this state-of-the-art text is essential for vision scientists, biomedical engineers, and advanced clinicians with an interest in the role of mechanics in ocular function, disease, therapeutics, and surgery. With every chapter, leading experts strengthen the arguments that biomechanics is an indispensable and rapidly evolving tool for understanding and managing ocular disease.