Time-varying, slow-phase component interaction in congenital nystagmus
نویسندگان
چکیده
منابع مشابه
Time-varying, slow-phase component interaction in congenital nystagmus
We investigated the nystagmus of a 12-year-old boy with suspected X-linked congenital nystagmus (CN) and exophoria to determine the underlying mechanisms and component signals in the 'dual-velocity' and other slow phases of his Asymmetric (a)Periodic Alternating Nystagmus (APAN). Fast Fourier transforms (FFT) were performed on the waveforms and residual data after subtracting a sawtooth wavefor...
متن کاملThe torsional component of "horizontal" congenital nystagmus.
OBJECTIVES To study the relationship between the major horizontal and minor torsional components of congenital nystagmus to elucidate the diagnostic importance, effects on vision, and pathogenetic implications of the torsional components. METHODS We recorded the eye movements of 13 subjects with congenital nystagmus using a three-dimensional magnetic search coil technique over a 15-year perio...
متن کاملContour interaction in the presence of congenital nystagmus
Using a computer-generated acuity task, the resolution of vertical and horizontal Landolt Cs was assessed at three levels of contrast, each for three different crowding conditions. Eighteen adults participated; six had congenital idiopathic nystagmus, six were oculocutaneous albinos and six served as controls. Contour interaction was evident when bars were placed 1 gap-width from the Landolt C ...
متن کاملCongenital nystagmus
Key-words Disease name Definition/Diagnosis criteria Differential diagnosis Pathophysiology Clinical description Paraclinic testing and diagnosis Frequency Treatment Reference
متن کاملStudy of congenital nystagmus: optokinetic nystagmus.
A severe defect of optokinetic nystagmus (OKN) was found in 46 patients with congenital nystagmus. Abnormal patterns of OKN, such as superimposition of pendular oscillations on the optokinetic slow component and inversion of OKN, were observed. Optokinetic gain (eye movement velocity/drum velocity) was decreased compared to that in normal subjects, and optokinetic after-nystagmus, or transient ...
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ژورنال
عنوان ژورنال: Vision Research
سال: 2004
ISSN: 0042-6989
DOI: 10.1016/j.visres.2003.09.007