On the Senescence of Human Vision
Oxford University Press (Verlag)
978-0-19-262034-7 (ISBN)
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This book addresses the questions of why we age, why our eyesight sometimes deteriorates as we get older and what harm can be caused by light. It shows how the questions are interlinked - the older we get, the more we are exposed to light, but the roles of the modern environment and basic processes of ageing need to be kept separate. The current increase in life expectancy in the Western world is not always matched by the rise in the health span or the number of years with a high quality of life. In the case of eyesight the problem is complicated because occasional disabilities in later life are attributed by some authorities to age, and by others to cumulative effects of exposure to light. These problems are examined in this book. Notable advances have been made during recent years in our grasp of causes underlying senescence in general. They are based on considerations of genetics, immunology, the environment and diet. This book attempts to relate these advances to ageing phenomena in the eye and its performance.
Recent research regarding the lens, retina and vision in general is integrated with modern theories of ageing to give greater and deeper understanding of the ocular aging process. This book should be useful to those on courses concerned with visual science, opthalmologists, optometrists, gerontologists, psychologists and lighting engineers.
Part 1 Theories: senescence - is it definable?; ideas on senescence; is senescence planned?; organ-based concepts of senescence; cellular senescence; from senescent cells to genes for ageing. Part 2 The retinal image: image homoeostasis; a brief survey of the optics of the eye; static refraction; accommodation; a possible evolutionary pressure; absorption and diffusion; lenticular absorption of light; absorption and environment; lenticular fluorescence; scattering of light; cataract. Part 3 Retinal senescence: losses in the brain; further remarks on retinal vasculature; age and the retinal photoreceptors; the macular pigment; other retinal cells; Bruch's membrane; the retinal pigment epithelium (RPE); non-visual effects of visible radiations; age-related macular complications. Part 4 Senescent vision: absolute visual thresholds; incremental thresholds, with special reference to short-wavelength stimuli; spectral sensitivity; the visual field; glare, light adaptation and related effects; contrast sensitivity; spatial and temporal parameters; colour vision. Part 5 Coda - correlation or coincidence?: vital statistics; an anthropological aside; what limits life?; limiting functions; the endpoint: is senescence programmed?
| Erscheint lt. Verlag | 27.8.1992 |
|---|---|
| Zusatzinfo | halftones, numerous line drawings, bibliography |
| Verlagsort | Oxford |
| Sprache | englisch |
| Themenwelt | Medizin / Pharmazie ► Medizinische Fachgebiete ► Augenheilkunde |
| Medizin / Pharmazie ► Medizinische Fachgebiete ► Geriatrie | |
| ISBN-10 | 0-19-262034-7 / 0192620347 |
| ISBN-13 | 978-0-19-262034-7 / 9780192620347 |
| Zustand | Neuware |
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