The Effect Of Blur Adaptation On Contrast Sensitivity
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The Effect Of Blur Adaptation On Contrast Sensitivity
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Author : Vidhya Subramanian
language : en
Publisher:
Release Date : 2004
The Effect Of Blur Adaptation On Contrast Sensitivity written by Vidhya Subramanian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The Spatial And Temporal Characteristics Of Blur Adaptation
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Author : Vidhya Subramanian
language : en
Publisher:
Release Date : 2009
The Spatial And Temporal Characteristics Of Blur Adaptation written by Vidhya Subramanian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Contrast sensitivity (Vision) categories.
Abstract: The reduction in visual resolution due to visual blur is a common experience, especially when individuals requiring eyewear remove their spectacles or contact lenses. However, studies have shown that when one looks continually at a visual acuity chart through blur, the smallest letters that one can read at first are not as small as the letters that one can read several minutes later. This improvement in sensitivity following a period of exposure to blur is referred to as blur adaptation. The purpose of this dissertation is to evaluate the temporal and spatial aspects of blur adaptation. Ten subjects were enrolled in each of the three visual acuity studies. The temporal characteristics were assessed, firstly, by varying the initial blur exposure duration (0min, 1min, 5min and 15min exposures) to a natural scene image. Visual acuity measured using a short 1.5min and a long 10min computer-based letter presentations, using Bailey-Lovie optotypes, was the outcome measure. Secondly, the influence of varying letter exposure durations was tested using three letter presentation times (2sec, 4sec and 15sec exposure per letter). The spatial characteristics of adaptation were assessed by adapting to a blurred natural scene, visual acuity chart, and different sets of alphabets presented in large and small sizes. A fourth study, carried out on one subject, looked at the effects of blur adaptation on the contrast sensitivity function. It was seen that visual acuity was not influenced by the four initial blur exposure durations to the natural scene. Also, adaptation to stimuli with various spatial characteristics like a natural scene, acuity chart, and letters of varying sizes did not result in different acuity scores. However, there was a significant influence of test letter presentation duration. Acuity was better with long acuity presentation times compared to short presentation times. The acuity score from the 15sec per letter presentation was better than those from 2sec per letter and 4sec per letter presentations. Interestingly, blur adaptation did not significantly influence contrast sensitivity. Thus this work suggests that blur adaptation is not driven by spatial features but may be due to temporal summation effects.
Contrast Sensitivity Of The Human Eye And Its Effects On Image Quality
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Author : Peter G. J. Barten
language : en
Publisher: SPIE Press
Release Date : 1999
Contrast Sensitivity Of The Human Eye And Its Effects On Image Quality written by Peter G. J. Barten and has been published by SPIE Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Contrast sensitivity (Vision) categories.
This book examines the contrast sensitivity of the human visual system - concerning the eye's ability to distinguish objects from each other or from the background - and its effects on the imageforming process. The text provides equations for determining various aspects of contrast sensitivity, in addition to models that easily can be used for practical applications.
The Contrast Sensitivity Function From Laboratory To Clinic
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Author : Fang Hou
language : en
Publisher: Frontiers Media SA
Release Date : 2021-12-30
The Contrast Sensitivity Function From Laboratory To Clinic written by Fang Hou and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-12-30 with Science categories.
The Effects Of Optical Defocus On Visual Acuity And Contrast Sensitivity
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Author : Lori Ann Kim
language : en
Publisher:
Release Date : 2005
The Effects Of Optical Defocus On Visual Acuity And Contrast Sensitivity written by Lori Ann Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Contrast Sensitivity
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Author : Robert Shapley
language : en
Publisher: MIT Press
Release Date : 1993
Contrast Sensitivity written by Robert Shapley and has been published by MIT Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Contrast sensitivity (Vision) categories.
The seventeen contributions present current research in visual signal processing, in the retina and central pathways, and in the study of contrast sensitivity in humans. The seventeen contributions present current research in visual signal processing, in the retina and central pathways, and in the study of contrast sensitivity in humans.
Contrast Sensitivity Of The Human Eye And Its Effects On Image Quality
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Author : P. G. J. Barten
language : en
Publisher:
Release Date : 1999
Contrast Sensitivity Of The Human Eye And Its Effects On Image Quality written by P. G. J. Barten and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Emergent Techniques For Assessment Of Visual Performance
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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 1985-01-01
Emergent Techniques For Assessment Of Visual Performance written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985-01-01 with Medical categories.
Recent vision research has led to the emergence of new techniques that offer exciting potential for a more complete assessment of vision in clinical, industrial, and military settings. Emergent Techniques for Assessment of Visual Performance examines four areas of vision testing that offer potential for improved assessment of visual capability including: contrast sensitivity function, dark-focus of accommodation, dynamic visual acuity and dynamic depth tracking, and ambient and focal vision. In contrast to studies of accepted practices, this report focuses on emerging techniques that could help determine whether people have the vision necessary to do their jobs. In addition to examining some of these emerging techniques, the report identifies their usefulness in predicting performance on other visual and visual-motor tasks, and makes recommendations for future research. Emergent Techniques for Assessment of Visual Performance provides summary recommendations for research that will have significant value and policy implications for the next 5 to 10 years. The content and conclusions of this report can serve as a useful resource for those responsible for screening industrial and military visual function.
Glare And Contrast Sensitivity For Clinicians
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Author : M. Princeton Nadler
language : en
Publisher: Springer
Release Date : 1990
Glare And Contrast Sensitivity For Clinicians written by M. Princeton Nadler and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Medical categories.
There have been greater advances in our knowledge of the visual function and its disabilities in the past 50 years than had accumulated in all of the previous years. This applies not only to the basic science of biochemistry, physiology, physiopathology, and cytopathology but also to the diagnosis and treatment of visual dysfunction and ocular disease. These advances have been aided by a proliferation of ingenious instruments. When I began my residency in ophthalmology at The Wilmer Institute in 1938, one was supposed to learn not only the physiology of vision but also how to diagnose and treat all phases of ophthalmology including disabilities of the orbit, sclera, retina, lens, and cornea. In addition he or she was supposed to understand neuro-ophthalmology, ophthalmic genetics, and so-called uveitis. It soon became evident that no one could adequately comprehend all of these areas and, therefore, most young trainees today take a year or two of fel lowship in a specialized area following their three-to five-year residency train ing. Following this they join a group of other ophthalmologists and specialize. Thus, they become more expert in the diagnosis and treatment in a limited area in ophthalmology. When I returned to The Wilmer Institute in 1955 as Head of the Department I was the only full-time member of the staff. To date we have some 28 full-time ophthalmologists working in highly specialized areas of our institution.
Illuminance Effects On Human Infants Contrast Sensitivity
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Author : Elizabeth Sarah Shannon
language : en
Publisher:
Release Date : 1993
Illuminance Effects On Human Infants Contrast Sensitivity written by Elizabeth Sarah Shannon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.