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 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...
متن کاملVisual acuity and excitement.
Viewed within the framework of activation theory, individuals with low visual acuity might conceivably be seen as persons with low preferred levels of activation who seek to reduce stimulus input in order to maintain activation at their preferred level. It was hypothesized, therefore, that persons with low visual acuity would demonstrate less receptivity to environmental stimulation than highac...
متن کاملVisual acuity in insects.
The acuity of compound eyes is determined by interommatidial angles, optical quality, and rhabdom dimensions. It is also affected by light levels and speed of movement. In insects, interommatidial angles vary from tens of degrees in Apterygota, to as little as 0.24 degrees in dragonflies. Resolution better than this is not attainable in compound eyes of realistic size. The smaller the interomma...
متن کامل[Snellen visual acuity evaluation].
PURPOSE To evaluate the visual acuity (VA) measurement by Snellen chart at three main Ophthalmology centers in Curitiba, compare these measurements with a computerized method for calibrating VA and also with the standard theory developed by Hermann Snellen. METHODS Descriptive study including 15 Ophthalmology clinics and a computerized method to measure the VA. Using a tape measure and a cali...
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ژورنال
عنوان ژورنال: Journal of Vision
سال: 2016
ISSN: 1534-7362
DOI: 10.1167/16.4.35