Visual Contrast Sensitivity Deficits in ‘Normal' Visual Field of Patients with Homonymous Visual Field Defects due to Stroke: A Pilot Study

2013 ◽  
Vol 36 (5-6) ◽  
pp. 329-335 ◽  
Author(s):  
Philip L. Clatworthy ◽  
Elizabeth A. Warburton ◽  
David J. Tolhurst ◽  
Jean-Claude Baron
Keyword(s):  
Pilot Study ◽  
Visual Field ◽  
Contrast Sensitivity ◽  
Visual Field Defects ◽  
Visual Contrast ◽  
Normal Visual Field ◽  
Visual Contrast Sensitivity ◽  
Field Defects

PREDICTING VISUAL FIELD DEFECTS FOLLOWING SELECTIVE TRANSSYLVIAN AMYGDALOHIPPOCAMPECTOMY

2015 ◽  
Vol 86 (11) ◽  
pp. e4.148-e4
Author(s):  
S Fuller ◽  
K Hamandi ◽  
D K Jones ◽  
W P Gray
Keyword(s):  
Pilot Study ◽  
Visual Field ◽  
Temporal Lobe Epilepsy ◽  
Temporal Lobe ◽  
Diffusion Tensor ◽  
Resection Margins ◽  
Visual Field Defects ◽  
Individual Comparison ◽  
Optic Radiations ◽  
Field Defects

IntroductionSurgery for refractory temporal lobe epilepsy can cause postoperative visual field defects (VFD). This study aimed to predict personalised risk of VFDs for patients undergoing selective transsylvian amygdalohippocampectomy.MethodsPreoperative reconstruction of the optic radiations (OR) using diffusion tensor-based tractography was completed on two patients. The ‘average resection model’ uses a template from postoperative structural scans of five patient scans to predict an average resection in the patient. The OR tractography was compared with the resection margins to determine fibre involvement. The ‘multiple individual comparison model’ compared individual postoperative scans with the preoperative tractography to determine risk of VFD.ResultsIn Patient 1 the average resection overlapped the OR, so an average resection would be expected to produce a VFD. In 3/5 postoperative scans the resection intersected with the OR, indicating that 60% of prior resections would have caused a defect. In Patient 2 no overlap between resection and OR was found in either model. Perimetry confirmed VFD in patient 1 but not in patient 2.DiscussionThis pilot study demonstrates that the risk of postoperative VFDs can be predicted. The two models provide qualitatively different form of quantitative risk which could inform the discussion between patient and clinician.

scholarly journals Different Eye Movement Behaviors Related to Artificial Visual Field Defects–A Pilot Study of Video-Based Perimetry

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Changtong Mao ◽  
Kentaro Go ◽  
Yuichiro Kinoshita ◽  
Kenji Kashiwagi ◽  
Masahiro Toyoura ◽  
...  
Keyword(s):  
Pilot Study ◽  
Visual Field ◽  
Eye Movement ◽  
Visual Field Defects ◽  
Field Defects

Visual field constriction in children with shunt-treated hydrocephalus

2010 ◽  
Vol 6 (5) ◽  
pp. 481-485 ◽  
Author(s):  
Diana Rudolph ◽  
Ina Sterker ◽  
Gerd Graefe ◽  
Holger Till ◽  
Anett Ulrich ◽  
...  
Keyword(s):  
Visual Field ◽  
Visual Field Defects ◽  
Special Focus ◽  
Ophthalmological Examination ◽  
Visual Field Examination ◽  
Kinetic Perimetry ◽  
Visual Field Deficits ◽  
Normal Visual Field ◽  
Field Defects ◽  
Visual Field Constriction

Object Many ophthalmological abnormalities are described in conjunction with hydrocephalus. The results of visual field diagnosis remain a matter of further discussion. The aim of this study was to investigate visual field deficits in children with shunt-treated hydrocephalus. Methods All children over 6 years of age treated for hydrocephalus at the authors' institute between December 2007 and December 2008 were included in the study. The children underwent an ophthalmological investigation for strabismus and binocular function, ophthalmoscopy, visual acuity, and refraction. The special focus was the visual field diagnosis, which the authors established in all children with cognitive conditions. The investigation was made by using the Goldmann visual field examination (kinetic perimetry). Children with and without visual field defects were compared concerning age at the time of ophthalmological examination, genesis of hydrocephalus, and frontooccipital horn ratio measured on current CT or MR images. Results Complete investigations were undertaken in 56 children (24 girls and 32 boys, mean age 15.1 years). The following orthoptic pathological entities were diagnosed: 29 children have a strabismus in 29 cases, 17 of these have an exotropia, 12 an esotropia, 4 children a hypotropia, 2 a hypertropia and 3 children a heterophoria. A nystagmus was found in 10 children. The ocular fundus investigation showed 13 children with an optic nerve atrophy. A visual field diagnosis was possible in 44 of the 56 patients and was incomplete in 12 patients with cognitive deficits or inadequate compliance. In 24 of 42 children there was a concentric visual field constriction between 10° and 50° out of the center. Children with visual field deficits were older than those with a normal visual field (p = 0.051). Nine of 10 children with postmenigitic hydrocephalus had a visual field defect (p = 0.025). In children with visual field defects the frontooccipital horn ratio was significantly higher (p = 0.013). Conclusions The results suggest that children with shunt-treated hydrocephalus have a higher risk of having ophthalmological abnormalities. Visual field deficits are often a problem in these patients. A diagnostic visual field examination can complete the ophthalmological monitoring in patients with hydrocephalus, especially in patients with large ventricles. Children with postmeningitic hydrocephalus should be ophthalmologically monitored more frequently and intensively.

scholarly journals Evaluation of Contrast Sensitivity, Chromatic Vision, and Reading Ability in Patients with Primary Open Angle Glaucoma

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Maria P. Bambo ◽  
Blanca Ferrandez ◽  
Noemi Güerri ◽  
Isabel Fuertes ◽  
Beatriz Cameo ◽  
...  
Keyword(s):  
Visual Field ◽  
Contrast Sensitivity ◽  
Visual Function ◽  
Reading Ability ◽  
Early Stage ◽  
Open Angle Glaucoma ◽  
Visual Field Defects ◽  
Open Angle ◽  
Cross Sectional ◽  
Field Defects

Purpose. To compare contrast sensitivity, acquired color vision deficiency, and reading ability in patients with glaucoma at different stages of the disease and to establish correlations between visual field parameters and visual function scores.Methods. This prospective cross-sectional study included 121 glaucoma patients. Subjects with a diagnosis of chronic open angle glaucoma were recruited and classified according to Hodapp-Parrish-Anderson criteria. Patients with severe visual field defects were excluded because they were older, which could bias the interpretation of visual function tests. Contrast sensitivity was measured using the Pelli-Robson Chart and the CSV1000E test. Chromatic vision was evaluated using the Farnsworth-panel D15 and the L’Anthony D15 tests of Vision Color Recorder software. Reading ability was measured using Radner-Vissum test.Results. Contrast sensitivity (with photopic and mesopic luminance with glare) differed significantly between patients with early and moderate visual field defects (p<0.05). Reading ability scores and results of the chromatic vision tests did not differ significantly between the two groups. Significant and moderate Spearman correlations between visual field indexes and contrast sensitivity tests were detected.Conclusions. Contrast sensitivity was significantly worse in patients with moderate glaucoma compared to those with early-stage glaucoma. Evaluation of visual function in clinical practice provides important information to address a glaucoma patient’s vision complaints.

Assessing Hemianopia Objectively in Stroke Patients Using the VEP Technique: A Pilot Study

2015 ◽  
pp. 30-38
Keyword(s):  
Pilot Study ◽  
Visual Field ◽  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Visual Field Defects ◽  
Central Field ◽  
Stroke Patients ◽  
Pattern Visual Evoked Potential ◽  
Pattern Vep ◽  
Field Defects

The purpose of this pilot study was to assess hemianopic visual field defects objectively in individuals with stroke using the pattern, visual-evoked potential (VEP) technique. Subjects were comprised of 5 adults with documented hemianopic visual field defects. The central field and the intact hemi-field VEP amplitudes were significantly larger than found in the hemianopic field (p < 0.05). However, latency values were similar (p > 0.05). The objective pattern VEP has the potential to be used rapidly and reliably to detect for the presence of hemianopic visual field defects in stroke patients.

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