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Glare and Contrast Sensitivity for Clinicians

Glare and Contrast Sensitivity for Clinicians
Author: M. Princeton Nadler
Publisher: Springer Science & Business Media
Total Pages: 396
Release: 2012-12-06
Genre: Medical
ISBN: 1461232422

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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.


Visual Impairments

Visual Impairments
Author: National Research Council
Publisher: National Academies Press
Total Pages: 369
Release: 2002-08-17
Genre: Social Science
ISBN: 0309083486

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When children and adults apply for disability benefits and claim that a visual impairment has limited their ability to function, the U.S. Social Security Administration (SSA) is required to determine their eligibility. To ensure that these determinations are made fairly and consistently, SSA has developed criteria for eligibility and a process for assessing each claimant against the criteria. Visual Impairments: Determining Eligibility for Social Security Benefits examines SSA's methods of determining disability for people with visual impairments, recommends changes that could be made now to improve the process and the outcomes, and identifies research needed to develop improved methods for the future. The report assesses tests of visual function, including visual acuity and visual fields whether visual impairments could be measured directly through visual task performance or other means of assessing disability. These other means include job analysis databases, which include information on the importance of vision to job tasks or skills, and measures of health-related quality of life, which take a person-centered approach to assessing visual function testing of infants and children, which differs in important ways from standard adult tests.


Emergent Techniques for Assessment of Visual Performance

Emergent Techniques for Assessment of Visual Performance
Author: National Research Council
Publisher: National Academies Press
Total Pages: 75
Release: 1985-01-01
Genre: Medical
ISBN:

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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.


Webvision

Webvision
Author:
Publisher:
Total Pages: 0
Release: 2007
Genre:
ISBN:

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Clinical Applications of Contrast Detection in Visual Noise

Clinical Applications of Contrast Detection in Visual Noise
Author: Guan Khar Beh
Publisher:
Total Pages: 248
Release: 1992
Genre:
ISBN:

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The process of dectecting low contrast targets in visual noise is known as contrast detection in noise (CDN). Recent studies have suggested that CDN Is capable of Isolating the optical and neural components of the eye. This research investigates the potential of applying CDN as a procedure for clinical deployment. A computer based contrast sensitivity system optically combined with quantifiable visual noise was Initially used to examine the theoretical principles of CDN. Discriminating changes of CDN were found in neurally based pathologies, such as amblyopia and diabetic retinopathy. Such changes were not observed in cases with purely optical loss, such as cataracts and soft contact lens wear. This formed the basis of differentiating the neural and optical components of human visual function. Good repeatabilities of CDN were established in both young and aged healthy eyes. In addition, there was also good repeatability in pathological cases, such as cataracts and amblyopia. To extend this research Into a clinical examination technique, a new chart system with low contrast letters embedded in visual noise (the Noise Charts was developed from the principles established using the computer equipment. An effective and user-friendly scoring system (Subsco) was also developed for clinical use. The results indicated that the Noise Charts were capable of replacing the computer equipment. Suggestions for future research and improvements on chart designs were also discussed.


Contrast Sensitivity

Contrast Sensitivity
Author: Robert Shapley
Publisher: Bradford Books
Total Pages: 362
Release: 1993
Genre: Medical
ISBN: 9780262193399

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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.


Making Eye Health a Population Health Imperative

Making Eye Health a Population Health Imperative
Author: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
Total Pages: 587
Release: 2017-01-15
Genre: Medical
ISBN: 0309439981

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The ability to see deeply affects how human beings perceive and interpret the world around them. For most people, eyesight is part of everyday communication, social activities, educational and professional pursuits, the care of others, and the maintenance of personal health, independence, and mobility. Functioning eyes and vision system can reduce an adult's risk of chronic health conditions, death, falls and injuries, social isolation, depression, and other psychological problems. In children, properly maintained eye and vision health contributes to a child's social development, academic achievement, and better health across the lifespan. The public generally recognizes its reliance on sight and fears its loss, but emphasis on eye and vision health, in general, has not been integrated into daily life to the same extent as other health promotion activities, such as teeth brushing; hand washing; physical and mental exercise; and various injury prevention behaviors. A larger population health approach is needed to engage a wide range of stakeholders in coordinated efforts that can sustain the scope of behavior change. The shaping of socioeconomic environments can eventually lead to new social norms that promote eye and vision health. Making Eye Health a Population Health Imperative: Vision for Tomorrow proposes a new population-centered framework to guide action and coordination among various, and sometimes competing, stakeholders in pursuit of improved eye and vision health and health equity in the United States. Building on the momentum of previous public health efforts, this report also introduces a model for action that highlights different levels of prevention activities across a range of stakeholders and provides specific examples of how population health strategies can be translated into cohesive areas for action at federal, state, and local levels.


Contrast Sensitivity of the Human Eye and Its Effects on Image Quality

Contrast Sensitivity of the Human Eye and Its Effects on Image Quality
Author: Peter G. J. Barten
Publisher: SPIE Press
Total Pages: 236
Release: 1999
Genre: Contrast sensitivity (Vision)
ISBN: 9780819434968

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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.