Upon investigating -the effects of monocular visual field loss in glaucoma patients, a team of Chinese researchers found that the binocular visual field remains relatively intact as long as one eye is at normal or early stage.. This observational, cross-sectional study evaluated 250 glaucoma patients and 31 healthy patients who were assigned to groups according to the stage of monocular visual field loss they were experiencing: normal, early, moderate or severe. The researchers assessed the binocular visual fields via integrated visual field and Esterman binocular visual evaluations and compared monocular and binocular visual field parameters within and among groups. In patients with one eye at normal or early stage and the other at severe stage, the team found that the average integrated mean deviations were -1.67dB and -3.27dB, respectively, and the average Esterman scores were 99.17% and 96.08%, respectively. In patients with both eyes at moderate or severe stage, they notes that the average ...
Upon investigating -the effects of monocular visual field loss in glaucoma patients, a team of Chinese researchers found that the binocular visual field remains relatively intact as long as one eye is at normal or early stage.. This observational, cross-sectional study evaluated 250 glaucoma patients and 31 healthy patients who were assigned to groups according to the stage of monocular visual field loss they were experiencing: normal, early, moderate or severe. The researchers assessed the binocular visual fields via integrated visual field and Esterman binocular visual evaluations and compared monocular and binocular visual field parameters within and among groups. In patients with one eye at normal or early stage and the other at severe stage, the team found that the average integrated mean deviations were -1.67dB and -3.27dB, respectively, and the average Esterman scores were 99.17% and 96.08%, respectively. In patients with both eyes at moderate or severe stage, they notes that the average ...
Purpose : To compare healthcare utilization and visual field progression of glaucoma patients who add or switch topical therapies vs. patients managed on topical monotherapy. Methods : This was a retrospective analysis of Kaiser Permanente Southern California electronic health records between 2001 and 2011, with supplemental chart review. Records of newly-diagnosed glaucoma (ICD-9 365.xx) patients aged 18 years or older and prescribed a glaucoma agent within 90 days of diagnosis were included. Two cohorts were defined: patients treated with topical monotherapy for the study duration, and patients who switched or added drugs at any time during follow-up. Outcomes of interest included health care utilization measured by office visits, visual field testing, laser procedures, and surgery. The risk of visual field progression was assessed using multivariable Cox regression. Results : 6,014 newly diagnosed glaucoma patients were included for analyses; 1,783 remained on monotherapy and 4,231 ...
The NuCoria Visual Field Analyzer (nCFA) makes objective visual field testing a clinical reality.The NuCoria VIsual Field Analyzer It combines objectivity with
Purpose : To predict glaucomatous visual field (VF) worsening after at least 5 years using features of 3 baseline VFs.. Methods : In this retrospective multi-center cohort study, eyes with ≥ 5 reliable automated VFs and ≥ 5 years follow-up were selected. We also restricted the time between each follow-up VFs to be ≥ 6 months, the time between the first and third VFs to be ≤ 3 years, and glaucoma hemifield test (GHT) to be within/outside normal limits or borderline. VF features are extracted: (1) age, follow-up time, mean deviation (MD) and pattern standard deviation (PSD) of the 3rd VF, (2) GHT results, MD slope, PSD slope and intraclass correlation for the 3 baseline VFs, and (3) worsening VF locations using permutation of pointwise linear regression (PoPLR, slope,-1 dB/year and p,0.01) and the Collaborative Initial Glaucoma Treatment Study (CIGTS) score of the 3rd VF based on the 3 baselines. Worsening VFs were determined by CIGTS criteria, MD regression (minus slope, p,0.01) and PoPLR ...
ii) Ophthalmological exclusion criteria: diabetic retinopathy, infections (e.g. keratitis, conjunctivitis, uveitis), severe dry eyes, miotic drug, amblyopia, squint, nystagmus, albinism, any ocular pathology, in either eye, that may interfere with the ability to obtain visual fields, disc imaging or accurate IOP readings, keratoconus, intraocular surgery (except for uncomplicated cataract surgery) performed , 3 month prior to screening, history or signs of any visual pathway affection other than glaucoma, allergies with regard to topic glaucoma medication, history or presence of macular disease and / or macular edema, ocular trauma.. - Normal subjects. (i) General exclusion criteria: mental or neurological diseases, diabetes mellitus, history of coronary heart disease, stroke, migraine, vasospasm / Raynaud`s disease; drugs indicating severe systemic diseases (e.g. anti-diabetic or anti-hypertensive medication for subjects under 70 years of age), drugs or medications influencing reaction time, ...
One of the factors proposed to regulate the eye growth is the error signal derived from the defocus in the retina and actually, this might arise from defocus not only in the fovea but the whole visual field. Therefore, myopia could be better predicted by spatio-temporally mapping the environmental defocus over the visual field. At present, no devices are available that could provide this information. A Kinect sensor v1 camera (Microsoft Corp.) and a portable eye tracker were used for developing a system for quantifying indoor defocus error signals across the central 58° of the visual field. Dioptric differences relative to the fovea (assumed to be in focus) were recorded over the visual field and defocus maps were generated for various scenes and tasks.. © 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Full Article , PDF Article ...
Suprathreshold field screeners are in common use for the detection of glaucomatous field loss. The predictive power of a positive result (PP+) depends on the sensitivity and specificity of the screener in the population in which it is to be used. Using data from 755 normal individuals (1510 eyes), we calculated the PP+ of the Henson CFS2000 screening programme for a population aged 50 and over. 4.3% of normal eyes failed the screening programme. Ignoring one or two misses on the screening programme immediately adjacent to the disc reduced this figure to 1.3% and significantly improved the PP+ of the programme. Calculations of the PP+ at increasing glaucoma prevalence levels indicates this to be particularly relevant at low levels such as those encountered when screening middle aged and elderly populations. Optometrists should perform routine field analysis when screening for glaucoma provided they adhere to strict protocols. ...
Authors: Gall, Carolin , Mueller, Iris , Gudlin, Julia , Lindig, Anja , Schlueter, Dorothee , Jobke, Sandra , Franke, Gabriele H. , Sabel, Bernhard A. Article Type: Research Article Abstract: Purpose: The aim of the study was to examine if improvements of stimulus detection performance in visual field tests after intensive visual training of the visual field border zone in patients with visual field defects are associated with changes in self-reported vision- and health-related quality of life (QoL). Methods: We studied a clinical sample of 85 patients suffering from visual field loss after brain damage that underwent repetitive, daily light stimulation (vision restoration training, …VRT) of the visual field border and the blind visual field for up to 75 hrs (N = 16) or 150 hrs (N = 69). Stimulus detection was quantified in the central visual field with a campimetric method before and after intervention. Health-related QoL was assessed by the Health-Survey SF-36 and vision-related QoL by the ...
3 study visits. Visit 1: Baseline visit for consent, getting baseline data and finally randomizing the patient. Those randomized to intervention get their first session of simulated visual field (2 per eye) on a regular computer for training purposes.. Visit 2: 1 to 2 days after baseline. The intervention group gets 1 practice test per eye. Then both groups get a regular automated visual field Visit 3: 1 to 2 weeks after baseline. The intervention group gets 1 practice test per eye. Then both groups get a regular automated visual field.. Study Ends, patient gets seen by the patient. ...
In the visual cortex, the representation of central visual space is supplied by matching geniculate inputs that are driven exclusively by one eye or the other. In layer 4 of early visual areas (V1 in primates and V1 and V2 in cat), these inputs form a nearly uniform array of small ocular dominance domains, while preserving overall topographic order within the cortical map. In ferret, however, ocular dominance domains in different regions of the visual cortex are strikingly irregular in size and shape. The exceptionally large size of domains in some regions implies a departure from the usual visuotopic matching of inputs from the two eyes. Using optical-imaging, electrophysiological, and anatomical techniques, we show that this regional variation is attributable to exclusively monocular maps of the central portions of the ipsilateral visual field in V1 and the contralateral visual field in V2. In addition, we document a complex interdigitation of V1 and V2 that entails a discontinuity in the ...
The location of VF damage did not clearly influence the degree of balance impairment in our study. When considering visual dependence of balance as an outcome, worse IVF sensitivity or more peripheral points missed in the superior and inferior VFs were each associated with lower visual dependence when evaluated in separate models, though neither stood out as uniquely important in models designed to test for the independent importance of damage in each region. With regards to RMS sway, superior VF damage, but not inferior VF damage, was associated with AP and ML sway when both were considered in a single model. However, high collinearity was noted in these models (VIFs of 4.2-4.3 and 2.3-2.4 for models evaluating central and peripheral VF loss, respectively), suggesting that the derived regression coefficients may not be meaningful. Furthermore, when the difference between superior and inferior VF damage was considered in models with overall damage included as a covariate, no association was ...
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In this study, we attempted to investigate the association of visual field defects with collisions with oncoming right-turning cars by testing patients with advanced glaucoma in a DS. Our results indicated that lower mean sensitivity in the inferior IVF hemifield contributed significantly to MVCs with oncoming right-turning cars in a DS.. Recently, a number of studies have described the importance of determining which areas of the visual field are associated with MVC involvement. Huisingh et al14 reported that drivers with a severely impaired lower or left field were more involved in MVCs, while Glen et al15 found that lowered performance in the hazard perception test (a part of UK driving examinations) was more strongly associated with defects in the upper visual field than the lower field. On the other hand, Yuki et al12 reported that central VF damage had no effect on MVCs; these studies have yielded conflicting results on which areas of the VF are most likely to be associated with MVCs. In ...
Norma Devine, Editor. On Wednesday, January 26, 2005, Dr. Rick Wilson, a glaucoma specialist at Wills, and the glaucoma chat group discussed "Stages of Glaucoma Progression.". Moderator: Many believe that glaucoma damages the peripheral vision first, but glaucoma doctors and patients seem to have a different understanding of what peripheral means. Where does glaucoma first occur in the visual field and is that considered to be peripheral?. Dr. Rick Wilson: The visual field test that you all take extends out to 30 degrees from the center. Therefore, peripheral visual field loss on that test is only part way out to the 90 degrees that we see temporally. The earliest nerve damage secondary to early moderate nerve damage is usually above the center of vision, 15 to 20 degrees from the center, or in the nasal field 20 to 30 degrees from center. Remember that 35 to 45% of the optic nerve is damaged before consistent changes appear in the visual field.. P: Instead of saying that glaucoma affects ...
FRIDAY, Feb. 16, 2018 (HealthDay News) -- Patients of African descent with glaucoma have increased visual field variability compared to those of European descent, likely contributing to delayed detection of progression, according to a study published online Feb. 15 in JAMA Ophthalmology.. Carolina P.B. Gracitelli, M.D., Ph.D., from the University of California, San Diego, in La Jolla, and colleagues examined racial differences in longitudinal visual field variability in a multicenter prospective observational cohort study. Data were included for 236 eyes of 173 individuals of European descent and 235 eyes of 171 individuals of African descent. Participants were followed for a mean of 7.5 years.. The researchers found that the eyes of individuals of African descent had a larger mean standard deviation of the residuals than eyes of individuals of European descent (1.45 versus 1.12 dB). A larger increase in variability with worsening disease was seen in the eyes of individuals of African descent. ...
The V4 RF profile represents a constant-sized, circular sampling of the V1 surface distribution of the visual field (Motter, 2009). Because the visual field representation across the V1 surface is based on the cortical magnification factor (CMF), there is a radial expansion of the receptive field for V4 (and potentially all cortical areas sampling from V1). Figure 1 illustrates a model V4 RF centered at 4° in the periphery in the lower right visual quadrant; the scaling for the RF is in degrees of visual angle. The RF model was constructed based on a circular sampling of the V1 surface model (Motter, 2009) centered 4° into the periphery and proceeding in 1 mm concentric steps from 1 to 7 mm along the surface. The nested contours represent those steps and generally equate with the sensitivity contours within the RF; sensitivity decreases away from the RF center. The location of highest sensitivity is defined as the RF center even though its location is displaced toward the fovea as a result of ...
PURPOSE: To evaluate the influence of visual field (VF) examinations using modern techniques with short examination times on the intraocular pressure (IOP). METHODS: Sixty-one consecutive patients, aged 28-90 years, 40 women and 21 men, were examined
One hundred and thirty patients of cerebrovascular accidents were subjected to a visual field examination using a Static Campimeter and a Goldmann perimeter. Thirty seven cases of homonymous field...
Cranial Nerve 1- Olfaction This patient has difficulty identifying the smells presented. Loss of smell is anosmia. The most common cause is a cold (as in this patient) or nasal allergies. Other causes include trauma or a meningioma affecting the olfactory tracts. Anosmia is also seen in Kallman syndrome because of agenesis of the olfactory bulbs. Cranial Nerve 2- Visual acuity This patientâs visual acuity is being tested with a Rosenbaum chart. First the left eye is tested, then the right eye. He is tested with his glasses on so this represents corrected visual acuity. He has 20/70 vision in the left eye and 20/40 in the right. His decreased visual acuity is from optic nerve damage. Cranial Nerve II- Visual field The patients visual fields are being tested with gross confrontation. A right sided visual field deficit for both eyes is shown. This is a right hemianopia from a lesion behind the optic chiasm involving the left optic tract, radiation or striate cortex. Cranial Nerve II- Fundoscopy ...
Cranial Nerve 1- Olfaction This patient has difficulty identifying the smells presented. Loss of smell is anosmia. The most common cause is a cold (as in this patient) or nasal allergies. Other causes include trauma or a meningioma affecting the olfactory tracts. Anosmia is also seen in Kallman syndrome because of agenesis of the olfactory bulbs. Cranial Nerve 2- Visual acuity This patientâs visual acuity is being tested with a Rosenbaum chart. First the left eye is tested, then the right eye. He is tested with his glasses on so this represents corrected visual acuity. He has 20/70 vision in the left eye and 20/40 in the right. His decreased visual acuity is from optic nerve damage. Cranial Nerve II- Visual field The patients visual fields are being tested with gross confrontation. A right sided visual field deficit for both eyes is shown. This is a right hemianopia from a lesion behind the optic chiasm involving the left optic tract, radiation or striate cortex. Cranial Nerve II- Fundoscopy ...
Visual Fields: Examination and Interpretation by Thomas J Walsh, M.D. starting at $3.98. Visual Fields: Examination and Interpretation has 3 available editions to buy at Alibris
List of 13 disease causes of Bilateral visual field error, patient stories, diagnostic guides. Diagnostic checklist, medical tests, doctor questions, and related signs or symptoms for Bilateral visual field error.
88 eyes of 48 consecutive patients were included for study, 20 male and 28 female, aged 57-94 (avg. 79). All patients had glaucomatous optic nerve cupping and/or glaucomatous visual field loss prior to treatment. Pretreatment, IOPs ranged 6-23mm Hg (avg. 13) on 0-3 (avg. 1.6) medications. 33 eyes had had prior glaucoma surgery. Snellen visual acuities (VA) ranged 20/15 to count fingers (median 20/60). Prior to treatment, both VEPs and ORPs of all eyes were abnormal. Following panmacular SDM, VA and IOP were unchanged, while VEP amplitudes (p=0.001) and automated perimetry by ORP ( ...
Neurons in area MT have localized receptive fields representing the contralateral hemifield and play an important role in processing of visual motion. We recorded the activity of these neurons during a working memory task in which the remembered (sample) and the comparison (test) random-dot stimuli, separated by a temporal delay, were presented in opposite hemifields. This allowed us to determine whether the activity of MT neurons during the performance of this task is generated locally within MT or reflects top-down influences of cortical areas with access to the information from the entire visual field.. In nearly half of the recorded neurons (n = 45), activity during every epoch of the trial was altered by the presentation of stimuli at a remote contralateral location. Following a sample placed in the receptive field, many neurons showed transient activation early in the delay. A remote sample often induced inhibition, and was almost never followed by the early delay activity. Excitation and ...
Positron emission tomography (PET) was used to identify the neural systems involved in shifting spatial attention to visual stimuli in the left or right visual field along foveofugal or foveocentric directions. Psychophysical evidence indicated that stimuli at validly cued locations were responded to faster than stimuli at invalidly cued locations. Reaction times to invalid probes were faster when they were presented in the same than in the opposite direction of an ongoing attention movement. PET evidence indicated that superior parietal and superior frontal cortex were more active when attention was shifted to peripheral locations than when maintained at the center of gaze. Both regions encoded the visual field and not the direction of an attention shift. In the right superior parietal lobe, two distinct responses were localized for attention to left and right visual field. Finally, the superior parietal region was active when peripheral locations were selected on the basis of cognitive or ...
Australian demographic studies show that visual impairment contributes significantly to elderly disability. Visual field loss due to glaucoma, the sec
... is a method of partial covering (occlusion) of the visual field of the two eyes in which the sector of the visual field that is adjacent to the nose (the nasal visual field) is occluded for each eye. It is a well-known procedure in vision therapy.
In patients with glaucoma, frequent visual field testing may be associated with earlier detection of the conditions progression, according to a report published Online First by Archives of Ophthalmology, one of the JAMA/Archives ...
Loss of vision in right side of visual field, both eyes, five times, twice with speaking disorders. First time 18 months ago. Visual problem resolved in 10 minutes after aspirin, followed by verbal deficits for half an hour. CAT scan of brain two days later showed no problems Then on 16 of June this year, same: visual disturbance, right side of both eyes, resolved after aspirin in 10 minutes. Drove self to hospital in 20 minutes. At intake I could not speak clearly. Could not pronounce
A team of researchers has found that patients who are blind in one side of their visual field were able to improve the visual detection.
Normal Values for the Full Visual Field, Corrected for Age- and Reaction Time, Using Semiautomated Kinetic Testing on the Octopus 900 ...
The patient sits in front of an (artificial) small concave dome in a small machine with a target in the center. The chin rests on the machine and the eye that is not being tested is covered. A button is given to the patient to be used during the exam. The patient is set in front of the dome and asked to focus on the target at the center. A computer then shines lights on the inside dome and the patient clicks the button whenever a light is seen. The computer then automatically maps and calculates the patients visual field. ...
Most people take for granted what the eye sees-the total visual field. The patient usually is unaware of problems, or blind spots, in the visual field. For example, very few people are aware that every normal eye has a blind spot in the retina, at the point where the optic nerve enters. Other blind spots can develop as the result of some systemic bodily dysfunction or the growth of a tumor. Quite commonly a blind spot is the first symptom that something is wrong. Unfortunately, it often goes unnoticed. Because manual visual field plotting is time consuming and expensive, it has not been included as part of a routine examination. Properly performed, however, no supplemental vision test is more important as an aid to early detection of visual abnormalities and blind spots symptomatic of other problems. It is therefore recommended that this test be performed routinely on all patients over age 30 and on any other patients presenting any symptoms warranting further investigation ...
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A visual representation of already encoded neural information of sensory stimuli can be achieved through a method used frequently in neuroimaging - functional magnetic resonance imaging. fMRI gives the experimenter the ability to construct a subjects visual field map or retinotopy (Wandell, Dumoulin & Brewer, 2007). A retinotopy is more specifically a form of topography or mapping that represents visual information in neurons at the visual field. fMRI is used for the functional purpose of blood-oxygen level dependent (BOLD) contrast to measure the effect of neural activity on blood flow and energy use by cells in the brain. BOLD contrast capitalises on the different magnetic fields expressed in deoxyhemoglobin and oxyhemoglobin during periods of neural activity known as hemo-dynamic responses (HDR) in the brain. These hemodynamic responses are correlated to local field potentials from EEG readings which refer to the electrical potentials in the extracellular matrix around neurons. This suggests ...
Similarly, blindness to be a disability under the SSI means statutory blindness. A person is considered blind for purposes of being eligible for SSI benefit when: (1) the child or adult has a central visual acuity of 20/200 or less in the better eye even while wearing eye glasses or contact lens; or (2) the child or adult has limited field of vision in the better eye in that the child or adult has a contraction of peripheral visual fields to 10 degrees from the point of fixation or the widest diameter of the childs or adults visual field subtends an angle no greater than 20 degrees ...
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PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
Assessing visual field progression in glaucoma may be more of an art than a science-and there is no one test to give reliable information that is needed about a patient, said Chris A. Johnson, PhD, DSc, FAAO, FARVO, professor, Department of Ophthalmology, and director, Visual Field Reading Center, University of Iowa, Iowa City. ...
Alteration of a fixation or peripheral stimulus displayed on a computer-driven display allows a human subject to maintain extended visual fixation upon the resulting dynamic stimulus. The fixation is presented upon the display and the stimulus is altered to allow resensitization of the subjects retina, thereby allowing prolonged visual fixation upon the resulting dynamic target. A dynamic stimulus may utilize a frequency doubling illusion.
The Frequency Doubling Technology (FDT) perimeter is a portable instrument designed for fast and effective detection of visual field loss1. This instrument (Welch Allyn, Skaneateles, N.Y., and Carl Zeiss Meditec, Dublin, Calif.)
Other reasons for peripheral vision loss can be brain tumor, severe headaches, retinopathy or pigmentosa among others. When people lose their ability to see on the periphery, they feel as if the world has come to an end. This is not so. Sometimes, the vision loss is temporary and at other times, while in the case of glaucoma, it is permanent. It all depends on the severity of your ailment.. But if you feel that you are losing your vision or feel that you cannot see on the sides, then consult an eye-specialist immediately. It can be the beginning of something severe or can be something temporary as migraine.. Only an ophthalmologist can tell you exactly what the problem is. Also remember in case of strokes, the condition is emergent. The speed at which the patient gets treatment determines how much damage occurs to his brain. If immediate treatment is given, it can prevent peripheral vision loss.. ...
Glaucoma is generally considered a disease of the eye in which sensitivity to ocular pressure causes damage to the retina and optic nerve, which are components of the central nervous system and do not regenerate. The damage begins in the peripheral visual field and progresses toward the center resulting in complete blindness unless detected early. For this reason, degeneration in glaucoma is often hard to detect ...
SP and visual sensitivity of FEF neurons. (A) Example of FEF neuron tested during step-ramp pursuit with target blink. Response continues during the blink, indi
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12 116 29. в The use of a logarithmic (decibel) scale to express visual field sensitivity results in the curvilinear relationship to structural measurements.
This chapter explores Winnicotts contribution to our understanding of the image, with particular reference to Gerhard Richters Mirror. In light of the recent turn to Winnicott in cultural and film studies, it argues for the importance of thinking between Winnicott and Jacques Lacan and for the concept of the mirror as a key starting point for that thinking.. ...
7 P a-Pro 1. 24 In keeping with the tradition of their profession, the Vianeos left no written record of their work, and any in- formation that we have must be gleaned from scattered testimony such as the story of a patient by the name taake Camillo Porzio (1530в1580). 012 0. USA 103 Pr opranolol.