A Whole Eye Finite Element Analysis of Accommodation PDF Download
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Author: Robert Peyton Wilkes
Publisher:
ISBN: 9781321475203
Category :
Languages : en
Pages : 133
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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.
Author: Robert Peyton Wilkes
Publisher:
ISBN: 9781321475203
Category :
Languages : en
Pages : 133
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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.
Author: Cynthia J. Roberts
Publisher: Kugler Publications
ISBN: 9062998860
Category : Medical
Languages : en
Pages : 546
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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.
Author: Ronald A. Schachar
Publisher: Kugler Publications
ISBN: 9062992331
Category : Anatomy
Languages : en
Pages : 280
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Book Description
The human eye is a remarkable optical device. In less than a second, a young human eye can accommodate from infinity to closer than 10 cm. Accommodation occurs with minimal effort and can be rapidly repeated with no apparent evidence of fatigue. Unfortunately, maximum accommodation decreases throughout life and by the fifth decade leads to presbyopia, the inability to read at a normal working distance. Interestingly, the mechanism by which the human eye is able to adjust focus has been debated for over 300 years. No previous theory has been put forth that can account for all the physical chang.
Author: David F. Chang
Publisher: SLACK Incorporated
ISBN: 9781556428593
Category : Intraocular lenses
Languages : en
Pages : 964
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Book Description
The IOL technical specifications, the clinical data, and the necessary clinical and surgical skills comprise the scientific foundation for achieving a "premium" refractive outcome. To consistently achieve patient satisfaction, however, requires mastering the art of patient and IOL selection, communicating and counseling effectively, and providing a "premium" patient experience. This is a nontraditional book in which multiple experts are separately asked to discuss controversial subjects in a reader-friendly format. There is balanced coverage of all of the available refractive IOLs, as well as those that may become available in the near future. A major emphasis is placed on avoiding and managing complications or potentially dissatisfied patients. There are more than 200 chapters that are organized into 14 major sections, over 300 images, 100 tables, and 12 sidebars that cover every aspect of refractive IOL clinical practice. This is a comprehensive educational resource addressing the most demanding and rapidly evolving area in cataract and refractive surgery today and the first book to cover both the clinical and nonclinical aspects of offering refractive IOL services.
Author: Valerie J. Broker
Publisher:
ISBN:
Category :
Languages : en
Pages : 194
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Book Description
Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 550
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Book Description
Author:
Publisher:
ISBN:
Category : Biomedical engineering
Languages : en
Pages : 380
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Book Description
Author: J. Sebag
Publisher: Springer
ISBN: 1493910868
Category : Medical
Languages : en
Pages : 917
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Book Description
The vitreous body long has been the most mysterious of all ocular structures, owing perhaps to its seeming simplicity. There have been few concerted, sustained efforts to unravel the mysteries of how vitreous is composed and what role it plays in normal physiology as well as pathology. Over the years, however, many studies have produced important findings concerning vitreous biochemistry, structure, physiology, and pathobiology. Published on the 25th anniversary of Sebag's first book on Vitreous, this second installment is nearly five times longer than its predecessor, reflecting how much has been learned in the past quarter century. This well-constructed compendium not only addresses the most current scientific knowledge, but also reviews clinical perspectives in a manner that lends richness to the scope of the book. Written by 90 authors, this book has 56 chapters organized into 7 sections: Biochemistry; Anatomy, Development, and Aging; Pathology/Pathobiology; Physiology and Phamacotherapy; Posterior Vitreo-Retinal Surgery; Peripheral Vitreo-Retinal Surgery; and Pharmacologic Vitreolysis. With a foreword by Coleman & Lincoff and an introduction by Wallace Foulds, Sebag's latest tome on vitreous is destined to be the authoritative text for years to come.
Author:
Publisher:
ISBN:
Category : Eye
Languages : en
Pages : 488
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Book Description
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 1380
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Book Description
