Reflexive Fusional Vergence and Its Plasticity Are Impaired in Convergence Insufficiency
نویسندگان
چکیده
منابع مشابه
Evaluation of ocular accommodation, convergence and fusional vergence changes during Ramadan
Purpose: There are a few researches regarding the effects of Islamic fasting on visual system. The aim of this study was to investigate the effects of Ramadan fasting on the amplitude of accommodation (AA), near point of convergence (NPC), positive and negative fusional vergences (PFV and NFV, respectively) in visually healthy fasters. Methods: AA, NPC, PFV and NFV at far (6m) and near (40cm) w...
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Fusional vergence dysfunction is a binocular condition that is relatively easy to diagnose and treat but is often overlooked. FVD can negatively impact an individual’s ability to function, particularly when performing near work. A 17-year-old white female presented to our clinic with visual symptoms associated with sustained near work. The findings were characterized by normal phorias, poor but...
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purpose: there are a few researches regarding the effects of islamic fasting on visual system. the aim of this study was to investigate the effects of ramadan fasting on the amplitude of accommodation (aa), near point of convergence (npc), positive and negative fusional vergences (pfv and nfv, respectively) in visually healthy fasters. methods: aa, npc, pfv and nfv at far (6m) and near (40cm) w...
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Two possible explanations are presented for the mechanism which limits the maximum fusional vergence response. An experimental paradigm is developed to differentiate between these alternatives. Experimental results indicate that the blur generally associated with strong fusional effort is due to convergence accommodation "overdrive." Th important theoretical and clinical implications of this fi...
متن کاملReduced vergence adaptation is associated with a prolonged output of convergence accommodation in convergence insufficiency
Convergence insufficiency (CI) is a developmental visual anomaly defined clinically by a reduced near point of convergence, a reduced capacity to view through base-out prisms (fusional convergence); coupled with asthenopic symptoms typically blur and diplopia. Experimental studies show reduced vergence parameters and tonic adaptation. Based upon current models of accommodation and vergence, we ...
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ژورنال
عنوان ژورنال: Investigative Opthalmology & Visual Science
سال: 2020
ISSN: 1552-5783
DOI: 10.1167/iovs.61.10.21