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https://www.readbyqxmd.com/read/29332124/optimal-audiovisual-integration-in-the-ventriloquism-effect-but-pervasive-deficits-in-unisensory-spatial-localization-in-amblyopia
#1
Michael D Richards, Herbert C Goltz, Agnes M F Wong
Purpose: Classically understood as a deficit in spatial vision, amblyopia is increasingly recognized to also impair audiovisual multisensory processing. Studies to date, however, have not determined whether the audiovisual abnormalities reflect a failure of multisensory integration, or an optimal strategy in the face of unisensory impairment. We use the ventriloquism effect and the maximum-likelihood estimation (MLE) model of optimal integration to investigate integration of audiovisual spatial information in amblyopia...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29279026/cortical-visual-connections-via-the-corpus-callosum-are-asymmetrical-in-human-infantile-esotropia
#2
Marcel P M Ten Tusscher, Anne Cees Houtman, Johan De Mey, Peter Van Schuerbeek
PURPOSE: Besides chiasmal hemidecussation, interhemispheric connections are likely important in human binocularity. The corpus callosum (CC) is the major fiber bundle in the mammalian brain which mostly connects homologous cortical areas in the two hemispheres. Visual interhemispheric connections were found abnormal in strabismic cats. No studies have investigated these pathways in humans with infantile strabismus. METHODS: Diffusion tensor imaging was used in four subjects with infantile esotropia (IE) and nine control subjects with normal binocularity, in order to study interhemispheric fibers in the CC connecting the right and left primary visual cortical areas...
December 26, 2017: Strabismus
https://www.readbyqxmd.com/read/29279023/knobby-eye-syndrome
#3
Joseph L Demer
INTRODUCTION: A spherical globe is traditionally assumed, but this study employed magnetic resonance imaging (MRI) to demonstrate frequent occurrence of non-spherical staphylomata in strabismic patients. METHODS: High-resolution, surface coil MRI was obtained in multiple image planes in 21 highly myopic subjects (36 eyes) and compared with 17 normal controls (33 eyes). Images were analyzed for axial length, aspect ratio of eye shape, and deflection of muscle paths...
December 26, 2017: Strabismus
https://www.readbyqxmd.com/read/29193320/contrast-balanced-binocular-treatment-in-children-with-deprivation-amblyopia
#4
Lisa M Hamm, Zidong Chen, Jinrong Li, Shuan Dai, Joanna Black, Junpeng Yuan, Minbin Yu, Benjamin Thompson
BACKGROUND: Children with deprivation amblyopia due to childhood cataract have been excluded from much of the emerging research into amblyopia treatment. An investigation was conducted to determine whether contrast-balanced binocular treatment - a strategy currently being explored for children with anisometropic and strabismic amblyopia - may be effective in children with deprivation amblyopia. METHODS: An unmasked, case-series design intended to assess proof of principle was employed...
November 28, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/29174394/visual-and-binocular-status-in-elementary-school-children-with-a-reading-problem
#5
Lisa W Christian, Krithika Nandakumar, Patricia K Hrynchak, Elizabeth L Irving
PURPOSE: This descriptive study provides a summary of the binocular anomalies seen in elementary school children identified with reading problems. METHODS: A retrospective chart review of all children identified with reading problems and seen by the University of Waterloo, Optometry Clinic, from September 2012 to June 2013. RESULTS: Files of 121 children (mean age 8.6 years, range 6-14 years) were reviewed. No significant refractive error was found in 81% of children...
November 21, 2017: Journal of Optometry
https://www.readbyqxmd.com/read/29150866/the-minimum-test-battery-to-screen-for-binocular-vision-anomalies-report-3-of-the-band-study
#6
Jameel Rizwana Hussaindeen, Archayeeta Rakshit, Neeraj Kumar Singh, Meenakshi Swaminathan, Ronnie George, Suman Kapur, Mitchell Scheiman, Krishna Kumar Ramani
PURPOSE: This study aims to report the minimum test battery needed to screen non-strabismic binocular vision anomalies (NSBVAs) in a community set-up. When large numbers are to be screened we aim to identify the most useful test battery when there is no opportunity for a more comprehensive and time-consuming clinical examination. METHODS: The prevalence estimates and normative data for binocular vision parameters were estimated from the Binocular Vision Anomalies and Normative Data (BAND) study, following which cut-off estimates and receiver operating characteristic curves to identify the minimum test battery have been plotted...
November 18, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/29144181/the-prevalence-of-amblyopia-and-its-determinants-in-a-population-based-study
#7
Mohammad Faghihi, Hassan Hashemi, Payam Nabovati, Mohammad Saatchi, Abbasali Yekta, Shokoofeh Rafati, Hadi Ostadimoghaddam, Mehdi Khabazkhoob
PURPOSE: To determine the prevalence of amblyopia and its determinants in a population-based study in Mashhad County, Iran. METHODS: This cross-sectional, population-based study was conducted on the population of Mashhad County aged >1 year using randomized stratified cluster sampling. Examinations were performed after selection of the participants and their free transportation to the sampling site. The examinations included the measurement of uncorrected and corrected visual acuity, cycloplegic and non-cycloplegic refraction, cover testing, slit-lamp biomicroscopy, and ophthalmoscopy...
November 16, 2017: Strabismus
https://www.readbyqxmd.com/read/29120248/the-evaluation-of-anatomic-and-functional-changes-in-unilateral-moderate-amblyopic-eyes-using-optical-coherence-tomography-and-pupil-cycle-time
#8
Tuncay Kusbeci, Omer Karti, Eyyup Karahan, Mustafa Oguztoreli
PURPOSE: To investigate whether macular anatomic structure and afferent visual system function differ among amblyopic eyes, non-amblyopic fellow eyes, and controls, using spectral-domain optical coherence tomography (SD-OCT), and pupil cycle time (PCT). METHODS: This observational, cross-sectional study included 30 patients with unilateral amblyopia and 30 healthy subjects. Optical coherence tomography (OCT) and pupil cycle time (PCT) were used to evaluate patients with unilateral amblyopia and were compared with their non-amblyopic fellow eyes and age- and gender-matched healthy eyes (30 participants)...
November 9, 2017: Current Eye Research
https://www.readbyqxmd.com/read/29114840/fixational-saccades-and-their-relation-to-fixation-instability-in-strabismic-monkeys
#9
COMPARATIVE STUDY
Suraj Upadhyaya, Mythri Pullela, Santoshi Ramachandran, Samuel Adade, Anand C Joshi, Vallabh E Das
Purpose: To evaluate the contribution of fixational saccades toward fixation instability in strabismic monkeys. Methods: Binocular eye movements were measured as six experimental monkeys (five strabismic monkeys and one monkey with downbeat nystagmus) and one normal monkey fixated targets of two shapes (Optotype, Disk) and two sizes (0.5°, 2°) during monocular and binocular viewing. Fixational saccades were detected using an unsupervised clustering algorithm. Results: When compared with the normal monkey, amplitude and frequency of fixational saccades in both the viewing and nonviewing eye were greater in 3 of 5 strabismic monkeys (1-way ANOVA on ranks P < 0...
November 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29114805/effect-of-stimulus-configuration-on-crowding-in-strabismic-amblyopia
#10
Yvonne Norgett, John Siderov
Foveal vision in strabismic amblyopia can show increased levels of crowding, akin to typical peripheral vision. Target-flanker similarity and visual-acuity test configuration may cause the magnitude of crowding to vary in strabismic amblyopia. We used custom-designed visual acuity tests to investigate crowding in observers with strabismic amblyopia. LogMAR was measured monocularly in both eyes of 11 adults with strabismic or mixed strabismic/anisometropic amblyopia using custom-designed letter tests. The tests used single-letter and linear formats with either bar or letter flankers to introduce crowding...
November 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/29025170/-the-motor-development-of-children-with-infantile-esotropia
#11
Julia Dillmann, Claudia Freitag, Kerstin Holve, Silke Schweinfurth, Birgit Lorenz, Gudrun Schwarzer
Background Until now, many studies have investigated the link between motor development and visual-spatial abilities in infancy and childhood. Most of these studies found evidence that there is such a link in typically developing children or children with locomotor delay. Only a few studies have tested the consequences of this link in children with abnormal visual development because of infantile esotropia. Moreover, little is known about the effects of late surgery on motor development. Patients and Methods We assessed the motor abilities of 3- to 7-year old children with severe deficits in stereopsis due to infantile esotropia (angle ≥ 12°) and typically developing children prior to and 12 to 16 months after surgery...
October 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29024763/slow-reading-in-children-with-anisometropic-amblyopia-is-associated-with-fixation-instability-and-increased-saccades
#12
Krista R Kelly, Reed M Jost, Angie De La Cruz, Lori Dao, Cynthia L Beauchamp, David Stager, Eileen E Birch
BACKGROUND: Previous studies show slow reading in strabismic amblyopia. We recently identified amblyopia, not strabismus, as the key factor in slow reading in children. No studies have focused on reading in amblyopic children without strabismus. We examined reading in anisometropic children and evaluated whether slow reading was associated with ocular motor dysfunction in children with amblyopia. METHODS: Anisometropic children (7-12 years) with or without amblyopia were compared to age-similar normal controls...
October 9, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28967080/new-pediatric-risk-factors-for-amblyopia-strabismic-versus-refractive
#13
Sandra Guimaraes, Maria Vieira, Tatiana Queirós, Andreia Soares, Patrício Costa, Eduardo Silva
PURPOSE: To assess the role of risk factors for amblyopia, such as family history and neonatal background, for the prediction of either strabismic amblyopia or refractive amblyopia. METHODS: In this retrospective case-control model, the study population included all children born at the Hospital de Braga during 1997-2012 (3 to 18 years old) with ophthalmologic consultation in 2014. Data collection was performed from the clinical database and through telephone questionnaire surveys...
September 11, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28955214/straightening-the-eyes-doesn-t-rebalance-the-brain
#14
Jiawei Zhou, Yonghua Wang, Lixia Feng, Jiafeng Wang, Robert F Hess
Surgery to align the two eyes is commonly used in treating strabismus. However, the role of strabismic surgery on patients' binocular visual processing is not yet fully understood. In this study, we asked two questions: (1) Does realigning the eyes by strabismic surgery produce an immediate benefit to patients' sensory eye balance? (2) If not, is there a subsequent period of "alignment adaptation" akin to refractive adaptation where sensory benefits to binocular function accrue? Seventeen patients with strabismus (mean age: 17...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28937884/diplopia-following-short-treatment-for-moderate-amblyopia
#15
Janice Hoole, Natasha Barrow
A case of an autistic child, aged 8 years, who reported binocular diplopia following just 2 hours total occlusion per day for 6 weeks for strabismic/anisometropic amblyopia is reported. There was a history of known long-standing reduced uniocular acuity without treatment. Pretreatment Sbisa bar assessment suggested moderate suppression. The diplopia was treated over 6 months including occluding the amblyopic eye and gradually reducing the density of the occluder until fixation with the nonamblyopic eye could be maintained and diplopia ignored...
September 2017: Strabismus
https://www.readbyqxmd.com/read/28915835/macular-retinal-and-choroidal-thickness-in-unilateral-amblyopia-using-swept-source-optical-coherence-tomography
#16
Syunsuke Araki, Atsushi Miki, Katsutoshi Goto, Tsutomu Yamashita, Go Takizawa, Kazuko Haruishi, Yoshiaki Ieki, Junichi Kiryu, Kiyoshi Yaoeda
BACKGROUND: To investigate macular retinal and choroidal thickness in amblyopic eyes compared to that in fellow and normal eyes using swept-source optical coherence tomography (SS-OCT). METHODS: This study examined 31 patients with hyperopic anisometropic amblyopia (6.9 ± 3.8 years, mean ± standard deviation), 15 patients with strabismic amblyopia without anisometropia (7.9 ± 4.2 years), and 24 age-matched controls (7.8 ± 3.3 years). Retinal and choroidal thickness was measured by 3D scans using SS-OCT...
September 15, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28913609/modulation-of-the-emotional-response-to-viewing-strabismic-children-in-mothers-measured-by-fmri
#17
J Berberat, M Montali, P Gruber, A Pircher, M Hlavica, F Wang, H P Killer, L Remonda
PURPOSE: Strabismus influences not only the individual with nonparallel eyes but also the observer. It has previously been demonstrated by fMRI that adults viewing images of strabismic adults have a negative reaction to the images as demonstrated by limbic activation, especially activation of the left amygdala. The aim of this study was to see if mothers would have a similar reaction to viewing strabismic children and whether or not that reaction would be different in mothers of strabismic children...
September 14, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/28814414/amblyopia-and-strabismus-trends-in-prevalence-and-risk-factors-among-young-adults-in-israel
#18
Yinon Shapira, Yossy Machluf, Michael Mimouni, Yoram Chaiter, Eedy Mezer
AIMS: To estimate the prevalence of amblyopia, present strabismus and amblyopia risk factors (ARFs) among young adults in Israel and to analyse trends over time of prevalence rates. METHODS: We conducted a cross-sectional study including 107 608 pre-enlistees aged 17.4±0.6 years born between 1971 and 1994. Across the birth years, the following trends of prevalence rates among young adults were analysed: prevalence of amblyopia, prevalence of strabismus, severity of amblyopia and prevalence of ARFs (strabismsus, anisometropia and isoametropia)...
August 16, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28744253/novel-eye-movement-disorders-in-whipple-s-disease-staircase-horizontal-saccades-gaze-evoked-nystagmus-and-esotropia
#19
Aasef G Shaikh, Fatema F Ghasia
Whipple's disease, a rare systemic infectious disorder, is complicated by the involvement of the central nervous system in about 5% of cases. Oscillations of the eyes and the jaw, called oculo-masticatory myorhythmia, are pathognomonic of the central nervous system involvement but are often absent. Typical manifestations of the central nervous system Whipple's disease are cognitive impairment, parkinsonism mimicking progressive supranuclear palsy with vertical saccade slowing, and up-gaze range limitation. We describe a unique patient with the central nervous system Whipple's disease who had typical features, including parkinsonism, cognitive impairment, and up-gaze limitation; but also had diplopia, esotropia with mild horizontal (abduction more than adduction) limitation, and vertigo...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28724818/to-assess-knowledge-and-attitude-of-parents-toward-children-suffering-from-strabismus-in-indian-subcontinent
#20
Anirudh Singh, Vipin Rana, Sagarika Patyal, Santosh Kumar, Sanjay K Mishra, Vijay K Sharma
PURPOSE: Strabismus and anisometropia are the most common causes of amblyopia. It can be easily prevented or treated if detected early. With the changing socio-cultural-economic milieu of the society, the perspectives of strabismus in society are gradually changing but still adequate knowledge, awareness, and attitude of parents toward strabismus will help in preventing amblyopia and aid in the proper psychosocial adaptation of such children. This study aimed to assess knowledge and attitude of parents toward children suffering from strabismus...
July 2017: Indian Journal of Ophthalmology
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