منابع مشابه
Visual acuity with brief stimuli.
INTRODUCTION ALTHOUGH the visual acuity of the eye has been often investigated, it has not yet been examined very fully in conditions of limited exposure time. The only known previous investigations in this field are those of Graham and Cook (1937), and Niven and Brown (1944), apart from a similar investigation on the somewhat analogous problem of intensity discrimination at short exposure time...
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References 1. Stoimenova, B.D. (2007). The Effect of Myopia on Contrast Thresholds. Invest. Ophthalmo. Vis. Sci.,48 (5), 2371‐2374 2. Westheimer, G. (2003). Visual acuity with reversed contrast charts: I. Theoretical and psychophysical investigation. Optom. Vis. Sci. 2003. 80(11), 745‐748 3. de Wit, G.C. & Coppens, J.E. (2003). Stray light of spectacle lenses compared with stray light in the ey...
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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 کاملVisual adaptation in relation to brief conditioning stimuli.
Measurements are made of the changes in state of visual adaptation before and after a change in conditioning stimulus. Liminal test stimulus is taken as a measure of visual adaptation. 1. The liminal test stimulus starts to rise sharply about 0*1 sec. before the eye is exposed to the conditioning stimulus. There is also a corresponding, but less marked, rise before the conditioning stimulus is ...
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ABSTRACT Background: The brain response to temporal frequencies (TF) has been already reported, but with no study reported for different TF with respect to various spatial frequencies (SF). Materials and Methods: fMRI was performed by 1.5T GE-system in 14 volunteers during checkerboard, with TFs of 4, 6, 8 and 10Hz in low and high SFs of 0.5 and 8cpd. Results: Average percentage BOLD signa...
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ژورنال
عنوان ژورنال: British Journal of Ophthalmology
سال: 1950
ISSN: 0007-1161
DOI: 10.1136/bjo.34.2.89