Dear Editor, We read the article “Pattern Visual Evoked Potential as a Predictor of Occlusion Therapy for Amblyopia” by Chung et al in December issue with keen interest. Amblyopia represents a major public health problem, the prevalence of which is usually underestimated, often because of lack of awareness. Strabismus develops in approximately 5% to 8% of the general population. The authors des...

A battery of colour vision tests was employed to evaluate visual function in patients with multiple sclerosis (M.S.). Colour deficits were found in 45% of patients tested with the Ishihara plates and 42.5% of patients tested with the FM 100-Hue test. 65% of M.S. patients failed at least one of the tests. The colour vision deficits were not restricted to patients with optic neuritis or with visu...

This study aimed to characterize the neural generators of the early components of the visual-evoked potential (VEP) to pattern-reversal gratings. Multichannel scalp recordings of VEPs and dipole modeling techniques were combined with functional magnetic resonance imaging (fMRI) and retinotopic mapping in order to estimate the locations of the cortical sources giving rise to VEP components in th...

Swelling of the optic disc may result from inflammation, infiltration, nerve compression or ischaemia, as well increased intracranial pressure. It can be imitated by local structural features leading to pseudopapilloedema. Disease entities swelling take different courses in paediatric population compared adult population. Investigations used confirm diagnosis include optical coherence tomograph...

PURPOSE To investigate the relationships between the pattern stimulation of different parts of the visual field (up to 25 degrees of eccentricity), the electrode position, and the cortical response to improve objective detection of local visual field defects. METHODS The human visual evoked potential (VEP) was assessed using multifocal pseudorandomly alternated pattern stimuli that were corti...

Background. Patients with diabetes suffer central nervous system (CNS) damage which is difficult to diagnose. Examination of evoked potentials (EP) — bioelectric responses of the nervous system to external sensory (SEP), acoustic (BAEP) or visual (VEP) stimuli — may be used to assess CNS dysfunction. Material and methods. We performed VEP and SEP studies in the median (SEPm) and the tibial (SEP...

The aim of this study was to evaluate the possibility of evaluation of optimal hyperopic correction based on visual evoked potential (VEP) examination results in children that do not cooperate. There are relatively few studies that evaluated the correlation between visual acuity and especially in young hyperopes. We examined 80 children (160 eyes) with hyperopia, divided into two groups: childr...

Cryptococcal induced visual loss is a devastating complication in survivors of cryptococcal meningitis (CM). Early detection is paramount in prevention and treatment. Subclinical optic nerve dysfunction in CM has not hitherto been investigated by electrophysiological means. We undertook a prospective study on 90 HIV sero-positive patients with culture confirmed CM. Seventy-four patients underwe...

Interhemispheric interactions were studied with functional brain mapping of visual processing. Children performed a reaction time task with uni- and bilateral targets and nontargets. The visual evoked potential (VEP) was segmented into P1a, P1b, and N1 microstates using map rather than channel features. Map latencies, amplitudes and sources were tested for bilateral interactions. Bilateral targ...