منابع مشابه
Patient information - myopia ( near - sightedness )
The eye is build like a small camera that projects the image of the environment on its inner wall. Instead of an electronic chip that captures the image, a light sensitive tissue layer covers the eye inside like a wall paper. It contains a dense array of photoreceptor cells which respond to light with an electrical signal. To see sharply, the projected image must be in good focus. This conditio...
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Some scientists have suggested that, among Hominidae, prolonged postmenopausal longevity evolved uniquely in humans [1], while others disagree [2]. There have, however, been few empirical studies on how physiological aging and somatic durability in humans compare to our closest relatives - chimpanzees and bonobos [3]. If prolonged lifespan is selected for in humans, physiological aging, includi...
متن کاملCreative Thought as Blind Variation and Selective Retention: Why Creativity is Inversely Related to Sightedness
Campbell (1960) proposed the theory that creativity required blind variation and selective retention (BVSR). More than a half century has transpired without any resolution of the controversy over the theory’s validity. This inability to reach consensus may reflect a fundamental failure on both sides to define the critical terms of the debate, namely, creativity and blindness. Hence, to help res...
متن کاملMammography screening: how far is too far?
INTRODUCTION This study answers the question: 'How far must a Canadian woman travel before the risk of a motor vehicle accident (MVA) outweighs the benefits of mammography screening?'. METHODS Numbers needed to screen and false positive rates were extracted from information in the breast screening guidelines from the Canadian Task Force on screening for breast cancer. Motor vehicle accidents ...
متن کاملShort-sightedness in sight-saving: half a strategy will not eliminate blinding trachoma.
a Civil and Environmental Engineering, Stanford University Stanford, California, CA, United States of America (USA). b Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, NC, USA. Correspondence to Maggie Montgomery (e-mail: [email protected]). Few diseases are more closely linked to the environment than trachoma – th...
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ژورنال
عنوان ژورنال: Nature
سال: 1885
ISSN: 0028-0836,1476-4687
DOI: 10.1038/031553a0