منابع مشابه
Myelinated retinal nerve fibers
A 7-year-old girl of second degree consanguineous parents, presented with an 8 months history of intermittent exotropia of the left eye. Cycloplegic refraction was -0.25.-0.50×165o and -3.00.0.50×20o in the right and left eyes respectively. An initial objective assessment of the visual function showed a best corrected visual acuity of 12/10 in the right eye and 6/10 in the left eye. Fundoscopy ...
متن کاملUnilateral Myelinated Retinal Nerve Fibers
A 5‐year‐old boy presented to our clinic for a routine check‐up. Best corrected visual acuity was 20/20 and 20/60 in the right and left eyes, respectively. Cycloplegic refraction revealed +0.50 −0.50 × 179° in the right eye and −6.50 −0.75 × 171° in the left eye. The left eye had an exotropia of 14 prism diopters. Anterior segment examination was normal in both eyes. On dilated funduscopy, the ...
متن کاملUnilateral Myelinated Retinal Nerve Fibers
87 Dear Editor, I read the photo essay titled “Unilateral Myelinated Retinal Nerve Fibers” with interest.[1] The authors reported a case of unilateral extensive myelination with amblyopia, with partial improvement after occlusion therapy. However, there was no comment about the status of the optic nerve head. Several reports have suggested that myelinated nerve fibers are associated with optic ...
متن کاملAnode break excitation in single myelinated nerve fibres.
It has long been considered that anode break excitation (ABE) is not elicitable in normal isolated nerve fibres. Quite recently, one of the authors (Konishi, 1957) found that it was due to weakness of the current applied and that, if a strong current (more than ten times the rheobase) was used, a single fibre, too, gave readily ABE. The present paper deals chiefly with threshold conditions for ...
متن کاملOn the capacity current in myelinated nerve fibres.
Different equivalent circuits are presented to describe the capacity current, Ic, of potential-clamped Ranvier nodes. The corresponding transfer functions are discussed in examining the influence of the involved parameters on size and time course of Ic. The following results were obtained: i. The duration and the amplitude of Ic increased with increasing membrane capacity. ii. The amplitude of ...
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ژورنال
عنوان ژورنال: Eye
سال: 2003
ISSN: 0950-222X,0078-5334
DOI: 10.1038/sj.eye.6700266