منابع مشابه
Symptomatic Rathke’s Cleft Cyst Presenting With Decreased Visual Acuity
Background and Importance: Symptomatic Rathke’s cleft cyst is a rare lesion that often presents without any symptoms. Case Presentation: We report a 40-year-old female with symptomatic Rathke’s cleft cyst located in the sellar and suprasellar region. She presented with visual disturbance, headache, weight gain, hypothyroidism and amenorrhea. The patient underwent surgery and ...
متن کاملDevelopment of visual acuity.
Catford, G. V., and Oliver, A. (1973). Archives of Disease in Childhood, 48, 47. Development of visual acuity. A hand-held electrically operated instrument has been devised to assess visual acuity by means of the phenomenon of optokinetic fixation nystagmus. An accurate determination of visual acuity has been obtained from an early age, and a graph of the normal visual acuity development produc...
متن کاملDefinition of visual acuity.
IT is well known that different types of test object will give different measures of acuity in terms of the size of the angle subtended at an observer's eye by the critical detail in the test object. Acuity of an average observer may vary from 1" arc, the thickness of a single black line just discernible on a white background, to about 1' arc, the size of a gap in a black ring viewed on a white...
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In this paper, we propose a visual feedback system for a neuroanatomy. The stereoscopic microscope image of the dentate gyrus of adult rat brain in the neuroanatomy is converted into a black and white image. By the region segmentation, the region of the dentate gyrus is extracted. A binary image is obtained from a microscopic photo of cresyl violet-stained coronal section of the rat brain as a ...
متن کاملEnhancing visual acuity.
The Enhancing Visual Acuity (EVA) System (Dutch Ophthalmic Research Centre International B.V.) features a unique fluid control system - VacuFlow Valve Timing Intelligence (VTi®) - and represents the next-generation evolution of pump machines. VacuFlow VTi® overcomes the limitations of existing Venturi and peristaltic pumps and provides the potential to enable safer, faster, and more precise tec...
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ژورنال
عنوان ژورنال: Nature
سال: 1977
ISSN: 0028-0836,1476-4687
DOI: 10.1038/266496a0