Accommodation And Vergence Mechanisms In The Visual System

This conference was instigated by a combination of factors: The nature of the problem, the wide spread occupational epidemiology reported on eye symptoms and eye fatigue in the workplace, and the organizers' awareness of the complexity of the scientific and clinical bases of knowledge that might be usefully applied. The introduction of new methods into system neurobiology provides new insights into how we receive and process information from the external world, and act upon it. New, non-invasive methods have opened the way to direct observation of the human brain in action. Due particularly to the interaction between the visual and oculomotor requirements involved, several clinical and scientific fields intersect when these issues are considered. To provide clear vision the accommodative and pupillary mechanisms are used. To maintain binocularity, the ver gence oculomotor system, sensitive to fatigue, must attain congruence with accommodative levels. This accommodation-vergence linkage was a focus of our symposium.

Some of the best vision scientists in the world in their respective fields have contributed to chapters in this book. They have expertise in a wide variety of fields, including bioengineering, basic and clinical visual science, medicine, neurophysiology, optometry, and psychology. Their combined efforts have resulted in a high quality book that covers modeling and quantitative analysis of optical, neurosensory, oculomotor, perceptual and clinical systems. It includes only those techniques and models that have such fundamentally strong physiological, control system, and perceptual bases that they will serve as foundations for models and analysis techniques in the future. The book is aimed first towards seniors and beginning graduate students in biomedical engineering, neurophysiology, optometry, and psychology, who will gain a broad understanding of quantitative analysis of the visual system. In addition, it has sufficient depth in each area to be useful as an updated reference and tutorial for graduate and post-doctoral students, as well as general vision scientists.

The three-volume work Perceiving in Depth is a sequel to Binocular Vision and Stereopsis and to Seeing in Depth, both by Ian P. Howard and Brian J. Rogers. This work is much broader in scope than the previous books and includes mechanisms of depth perception by all senses, including aural, electrosensory organs, and the somatosensory system. Volume 1 reviews sensory coding, psychophysical and analytic procedures, and basic visual mechanisms. Volume 2 reviews stereoscopic vision. Volume 3 reviews all mechanisms of depth perception other than stereoscopic vision. The three volumes are extensively illustrated and referenced and provide the most detailed review of all aspects of perceiving the three-dimensional world.Volume 1 starts with a review of the history of visual science from the ancient Greeks to the early 20th century with special attention devoted to the discovery of the principles of perspective and stereoscopic vision. The first chapter also contains an account of early visual display systems, such as panoramas and peepshows, and the development of stereoscopes and stereophotography. A chapter on the psychophysical and analytic procedures used in investigations of depth perception is followed by a chapter on sensory coding and the geometry of visual space. An account of the structure and physiology of the primate visual system proceeds from the eye through the LGN to the visual cortex and higher visual centers. This is followed by a review of the evolution of visual systems and of the development of the mammalian visual system in the embryonic and post-natal periods, with an emphasis on experience-dependent neural plasticity. An account of the development of perceptual functions, especially depth perception, is followed by a review of the effects of early visual deprivation during the critical period of neural plasticity on amblyopia and other defects in depth perception. Volume 1 ends with accounts of the accommodation mechanism of the human eye and vergence eye movements.

The Encyclopedia of the Neuroscience explores all areas of the discipline in its focused entries on a wide variety of topics in neurology, neurosurgery, psychiatry and other related areas of neuroscience. Each article is written by an expert in that specific domain and peer reviewed by the advisory board before acceptance into the encyclopedia. Each article contains a glossary, introduction, a reference section, and cross-references to other related encyclopedia articles. Written at a level suitable for university undergraduates, the breadth and depth of coverage will appeal beyond undergraduates to professionals and academics in related fields.

This book contains all oral presentations, posters, and workshop transactions of the 28th Meeting of the European Strabismological Association that took place in Bergen, Norway. The highlight of the meeting is the ESA-lecture what can eye muscle studies tell us about strabismus by Prof. Gunnar Lennerstrand from Stockholm. All 60 oral presentations of the following sessions are described: screening, amblyopia, eye movements, vision, refraction, nystagmus, stereopsis, exotropia, vergence problems, refractive surgery, cataract and strabismus, strabismus surgery, botulinum toxin, EMG, oblique muscles, paralytic strabismus, thyroid, duane syndrome and varia.

This two volume set (LNCS 8025-8026) constitutes the refereed proceedings of the Fourth International Conference on Digital Human Modeling and Applications in Health, Safety, Ergonomics and Risk Management, formerly International Conference on Digital Human Modeling, DHM 2013, held as part of the 15th International Conference on Human-Computer Interaction, HCII 2013, held in Las Vegas, USA in July 2013, jointly with 12 other thematically similar conferences. The total of 1666 papers and 303 posters presented at the HCII 2013 conferences was carefully reviewed and selected from 5210 submissions. These papers address the latest research and development efforts and highlight the human aspects of design and use of computing systems. The papers accepted for presentation thoroughly cover the entire field of Human-Computer Interaction, addressing major advances in knowledge and effective use of computers in a variety of application areas. This two-volume set contains 91 papers. The papers in this volume focus on the following topics: digital human modeling and ergonomics in working environments; ergonomics of work with computers; anthropometry, posture and motion modeling.

Now in a fully up-to-date 6th Edition, Pickwell's Binocular Vision Anomalies provides a practical introduction to binocular vision, offering comprehensive theory, how-to clinical guidance, and a summary of current research in a single, consolidated volume. Ideally suited for both students and clinicians, this bestselling text serves as an accessible, evidence-based reference when faced with binocular vision or pediatric challenges. Covers routine examinations and testing protocols, including CISS questionnaire, cover test, foveal suppression, fixation disparity, four prism diopter base out test, Lindblom’s method, and double Maddox rod test. Includes numerous video clips of key testing procedures, including new clips on Mallett fixation disparity test and fusional reserve testing, as well as an interactive video quiz to help you test your knowledge. Features sweeping content updates such as the latest information on 3-D displays, therapeutic uses of computer games and virtual reality for vision therapy, computerized testing methodologies, binocular and accommodative mechanisms associated with myopia, updated prescribing criteria, therapeutic use of contact lenses, detection of pathology associated with strabismus, drugs causing diplopia, and the evidence-based treatment of convergence insufficiency syndrome and amblyopia. Contains helpful study features throughout, including Clinical Key Points boxes, step-by-step test routines, typical features of extraocular muscle palsies and syndromes, and Case Study boxes that cover important clinical and legal scenarios, and new boxes that summarize testing procedures for each of the main binocular vision tests.