نتایج جستجو برای: foveal reflex
تعداد نتایج: 25921 فیلتر نتایج به سال:
background: h-reflex is a valuable electrophysiological technique for assessing nerve conduction through entire length of afferent and efferent pathways, especially nerve roots and proximal segments of peripheral nerves. the aim of this study was to investigate the relation between normal values of flexor carpi radialis (fcr) h-reflex latency, upper limb length and age in normal subjects, and t...
چکیده مقدمه: مطالعه هدایت عصبی و الکترومیوگرافی با سوزن نقش محوری در ارزیابی بیماران دچار بیماری های عصبی- عضلانی دارد. اندازه گیری h-reflex عصب تیبیال یکی از رایج ترین مراحل الکترومیوگرافی بالینی است که بخصوص در تشخیص رادیکولوپاتی s1 مؤثراست. اهمیت h-reflex از این نظر است که در درگیری ریشه s1 – یکی از شایع ترین درگیری ها در هرنی دیسکال- خیلی زودستخوش تغییر می شود. هدف: برررسی میانگین h-reflex ...
Humans achieve a stable and homogeneous representation of their visual environment, although visual processing varies across the visual field. Here we investigated the circumstances under which peripheral and foveal information is integrated for numerosity estimation across saccades. We asked our participants to judge the number of black and white dots on a screen. Information was presented eit...
PURPOSE Albinism is associated with disrupted foveal development, though intersubject variability is becoming appreciated. We sought to quantify this variability, and examine the relationship between foveal cone specialization and pit morphology in patients with a clinical diagnosis of albinism. METHODS We recruited 32 subjects with a clinical diagnosis of albinism. DNA was obtained from 25 s...
1 Purpose To study the pathomorphology of subretinal hemorrhage (SRH) seen in eyes with 2 branch retinal vein occlusion (BRVO) and its association with visual prognosis. 3 Methods We reviewed retrospectively 42 consecutive patients (42 eyes) with BRVO that 4 affected the fovea. Retinal structural changes were examined by spectral domain optical 5 coherence tomography (SD-OCT). 6 Results On SD-O...
PURPOSE To investigate repeatability and reproducibility of thickness of eight individual retinal layers at axial and lateral foveal locations, as well as foveal width, measured from Spectralis spectral domain optical coherence tomography (SD-OCT) scans using newly available retinal layer segmentation software. METHODS High-resolution SD-OCT scans were acquired for 40 eyes of 40 young healthy...
IN a previous paper (van Balen and Henkes, 1960) we indicated the possibility of recording the response of the occipital lobe to light-stimulation in man. The use of Dawson's superimposition method together with the mathematical integration method enabled us to record the responses in all normal subjects. The specific response of the visual cortex consists of four different components: a small ...
Green, blue and short-wavelength-red rod hue biases are strongest and most reliable with large, dimly-mesopic, extra-foveal stimuli but tend to diminish when stimuli are confined to a small area of the central fovea. This study explores how the stimulation of foveal and extra-foveal areas interact in determining rod hue biases, and whether large stimuli are as effective for revealing rod hue bi...
PURPOSE We present a macular phenotype resulting from 1 or more abnormalities in the developmental pathway of the central retina. METHODS We describe the clinical and genetic characteristics of 7 patients observed since shortly after birth with regard to visual acuity, refractive error, anterior segment status, retinal findings including foveal structure, and natural history. RESULTS The pa...
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