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Binocular vision

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https://www.readbyqxmd.com/read/28222490/the-prevalence-of-convergence-insufficiency-in-iran-a-population-based-study
#1
Hassan Hashemi, Payam Nabovati, Mehdi Khabazkhoob, Hadi Ostadimoghaddam, Asgar Doostdar, Ehsan Shiralivand, Abbasali Yekta
PURPOSE: The aim was to determine the prevalence of convergence insufficiency and its relationship with age, gender and refractive error in a population-based study. METHODS: In this cross-sectional study, all residents over one year old in Mashhad city, in the north east of Iran, were sampled through random stratified cluster sampling. After selecting samples and their participation in the study, they all had eye examinations including the measurement of visual acuity, refraction, binocular vision assessment, including cover test, measurement of near point of convergence and fusional vergences and finally, slitlamp biomicroscopy...
February 21, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/28215499/near-binocular-visual-function-in-young-adult-orthokeratology-versus-soft-contact-lens-wearers
#2
Kate Gifford, Paul Gifford, Peter L Hendicott, Katrina L Schmid
PURPOSE: To compare near point binocular vision function of young adult myopes wearing orthokeratology (OK) lenses to matched single vision soft disposable contact lens (SCL) wearers. METHODS: A retrospective clinical record analysis of all OK wearers (18-30 years) presenting over an 18 month period was undertaken. Data was extracted for 17 OK wearers, with 17 SCL wearers matched for age, refractive error and duration of contact lens wear. Binocular vision data included horizontal phoria (phoria), horizontal base-in (BIFR) and base-out fusional reserves (BOFR) and accommodation accuracy (AA)...
February 15, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28203269/bionic-vision-based-intelligent-power-line-inspection-system
#3
Qingwu Li, Yunpeng Ma, Feijia He, Shuya Xi, Jinxin Xu
Detecting the threats of the external obstacles to the power lines can ensure the stability of the power system. Inspired by the attention mechanism and binocular vision of human visual system, an intelligent power line inspection system is presented in this paper. Human visual attention mechanism in this intelligent inspection system is used to detect and track power lines in image sequences according to the shape information of power lines, and the binocular visual model is used to calculate the 3D coordinate information of obstacles and power lines...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28197836/does-direction-of-walking-impact-binocular-rivalry-between-competing-patterns-of-optic-flow
#4
Richard Paris, Bobby Bodenheimer, Randolph Blake
When dissimilar monocular images are viewed simultaneously by the two eyes, stable binocular vision gives way to unstable vision characterized by alternations in dominance between the two images in a phenomenon called binocular rivalry. These alternations in perception reveal the existence of inhibitory interactions between neural representations associated with conflicting visual inputs. Binocular rivalry has been studied since the days of Wheatstone, but one recent strategy is to investigate its susceptibility to influences caused by one's own motor activity...
February 14, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28196497/comparison-of-visual-outcomes-spectacles-dependence-and-patient-satisfaction-of-multifocal-and-accommodative-intraocular-lenses-innovative-perspectives-for-maximal-refractive-oriented-cataract-surgery
#5
Raffaele Nuzzi, Federico Tridico
BACKGROUND: The aim of this study was to evaluate visual outcomes for different working distances (far, 60 cm and 33 cm) and impact on vision quality of multifocal IOLs AcrySof ResTOR SN6AD1 and SN6AD3 (Alcon, Inc., Fort Worth, Texas, USA) as well as REVIEW FIL611PV multifocal and OPTOFLEX FIL618 accommodative IOLs (Soleko, Ltd., Rome, Italy) in patients undergoing bilateral phacoemulsification. METHODS: In this observational prospective study 63 patients undergoing binocular cataract surgery were divided into four groups for implantation of one of the IOLs under evaluation...
February 14, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28191476/pharmacological-treatments-of-presbyopia-a-review-of-modern-perspectives
#6
REVIEW
Antonio Renna, Jorge Luciano Alió, Luis Felipe Vejarano
INTRODUCTION: Presbyopia affects people from the 4(th) decade of life and is characterized by accommodative loss that leads to negative effects on vision-targeted health-related quality of life. A non-invasive pharmacological treatment providing near-lenses independence would be a truly groundbreaking approach in the treatment of presbyopia. The purpose of this review is to analyze the emerging pharmacological solutions proposed to address presbyopia. RESULTS: Several ophthalmic eye drops compounds solutions have been described in peer-reviewed papers or presented in ophthalmological tabloids and congresses...
2017: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/28191358/retinitis-pigmentosa-and-bilateral-idiopathic-demyelinating-optic-neuritis-in-a-6-year-old-boy-with-ofd1-gene-mutation
#7
Xun Wang, Cong Zheng, Wen Liu, Hui Yang
To identify the cause of a sudden binocular vision decrease in patients with retinitis pigmentosa and bilateral idiopathic demyelinating optic neuritis is difficult, but early diagnosis and treatment significantly improve the prognosis. Here, we report a 6-year-old boy with a progressive binocular vision decrease in 38 days. The patient had a history of night blindness, a mottled retina without pigmentation, extinguished electroretinographic response, tritanopia, and an absent ellipsoid zone outside the macula fovea by optical coherence tomography in both eyes...
2017: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/28182120/sagging-eye-syndrome-or-nemaline-rod-myopathy-divergence-insufficiency-with-levator-dehiscence-as-an-overlapping-symptom-between-two-diagnoses
#8
Stephanie S L Cheung, Larissa K Ghadiali, Thomas H Brannagan Iii, Gul Moonis, Phyllis L Faust, Jeffrey G Odel
A 78-year-old woman complained of gradual, painless onset of horizontal binocular diplopia associated with progressive axial weakness. Physical examination revealed esotropia that was greater at distance than at near vision, bilateral levator dehiscence, and normal abducting saccadic speeds. Given the age of the patient and compatible clinical findings, the diagnosis of Sagging Eye Syndrome (SES) was made. However, further work-up with a muscle biopsy suggested Sporadic Late-Onset Nemaline Myopathy (SLONM) as the cause of her progressive muscle weakness...
2017: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/28165609/comparison-of-visual-outcomes-after-bilateral-implantation-of-extended-range-of-vision-and-trifocal-intraocular-lenses
#9
Ramón Ruiz-Mesa, Antonio Abengózar-Vela, Ana Aramburu, María Ruiz-Santos
PURPOSE: To compare visual outcomes after cataract surgery with bilateral implantation of 2 intraocular lenses (IOLs): extended range of vision and trifocal. METHODS: Each group of this prospective study comprised 40 eyes (20 patients). Phacoemulsification followed by bilateral implantation of a FineVision IOL (group 1) or a Symfony IOL (group 2) was performed. The following outcomes were assessed up to 1 year postoperatively: binocular uncorrected distance visual acuity (UDVA), binocular uncorrected intermediate visual acuity (UIVA) at 60 cm, binocular uncorrected near visual acuity (UNVA) at 40 cm, spherical equivalent (SE) refraction, defocus curves, mesopic and photopic contrast sensitivity, halometry, posterior capsule opacification (PCO), and responses to a patient questionnaire...
January 28, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28161340/evaluating-the-impact-of-strabismus-surgery-on-the-association-of-musculoskeletal-injuries-fractures-and-falls-with-disorders-of-binocular-vision-in-medicare-beneficiaries
#10
Stacy L Pineles, Michael X Repka, Fei Yu, Flora Lum, Anne L Coleman
Disorders of binocular vision that are increasingly prevalent among aged, fee-for-service Medicare beneficiaries are associated with fractures, falls, and musculoskeletal injuries. We evaluate whether strabismus surgery influences the association of injuries in elderly patients with disorders of binocular vision in a 5% random sample of Medicare fee-for-service claims data from 2010 to 2013. There were 22,237 Medicare beneficiaries with a claim that included a diagnosis of a disorder of binocular vision. Of these, the majority had strabismus (49...
February 1, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28155698/the-biomechanical-significance-of-pulley-on-binocular-vision
#11
Hongmei Guo, Zhipeng Gao, Weiyi Chen
BACKGROUND: Pulleys have been reported as the functional origins of the rectus extraocular muscles (EOMs). However, biomechanical significance of pulleys on binocular vision has not been reported. METHODS: Three eye movement models, i.e., non-pulley model, passive-pulley model, and active-pulley model, are used to simulate the horizontal movement of the eyes from the primary position to the left direction in the range of 1°-30°. The resultant forces of six EOMs along both orthogonal directions (i...
December 28, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28150809/selective-binocular-vision-loss-in-two-subterranean-caviomorph-rodents-spalacopus-cyanus-and-ctenomys-talarum
#12
T Vega-Zuniga, F S Medina, G Marín, J C Letelier, A G Palacios, P Němec, C E Schleich, J Mpodozis
To what extent can the mammalian visual system be shaped by visual behavior? Here we analyze the shape of the visual fields, the densities and distribution of cells in the retinal ganglion-cell layer and the organization of the visual projections in two species of facultative non-strictly subterranean rodents, Spalacopus cyanus and Ctenomys talarum, aiming to compare these traits with those of phylogenetically closely related species possessing contrasting diurnal/nocturnal visual habits. S. cyanus shows a definite zone of frontal binocular overlap and a corresponding area centralis, but a highly reduced amount of ipsilateral retinal projections...
February 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28150723/short-term-monocular-occlusion-produces-changes-in-ocular-dominance-by-a-reciprocal-modulation-of-interocular-inhibition
#13
Eva Chadnova, Alexandre Reynaud, Simon Clavagnier, Robert F Hess
Ocular dominance can be modulated by short-term monocular deprivation. This changes the contribution that each eye makes to binocular vision, an example of adult cortical neuroplasticity. Optical imaging in primates and psychophysics in humans suggest these neuroplastic changes occur in V1. Here we use brain imaging (MEG) in normal adults to better understand the nature of these neuroplastic changes. The results suggest that short-term monocular deprivation, whether it be by an opaque or translucent patch, modulates dichoptic inhibitory interactions in a reciprocal fashion; the unpatched eye is inhibited, the patched eye is released from inhibition...
February 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28137897/blood-brain-and-binocular-vision
#14
Egle Rostron, Mary Polly Dickerson, Gregory Heath
A man aged 51 years presented with sudden onset, horizontal, binocular, double vision and right facial weakness. Ocular motility examination demonstrated a right horizontal gaze palsy pattern in keeping with a one-and-a-half syndrome. Since this was associated with a concomitant, ipsilateral, lower motor neuron (LMN) facial (VIIth) cranial nerve palsy, he had acquired an eight-and-a-half syndrome. Diffusion-weighted MRI confirmed a small infarcted area in the pons of the brainstem which correlated with anatomical location of the horizontal gaze centre and VIIth cranial nerve fasciculus...
January 30, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28135308/individual-objective-and-subjective-fixation-disparity-in-near-vision
#15
Wolfgang Jaschinski
Binocular vision refers to the integration of images in the two eyes for improved visual performance and depth perception. One aspect of binocular vision is the fixation disparity, which is a suboptimal condition in individuals with respect to binocular eye movement control and subsequent neural processing. The objective fixation disparity refers to the vergence angle between the visual axes, which is measured with eye trackers. Subjective fixation disparity is tested with two monocular nonius lines which indicate the physical nonius separation required for perceived alignment...
2017: PloS One
https://www.readbyqxmd.com/read/28133945/objective-and-subjective-outcomes-of-strabismus-surgery-in-graves-orbitopathy-a-prospective-multicentre-study
#16
Hinke Marijke Jellema, Peerooz Saeed, Ilse Mombaerts, Peter J Dolman, Jim Garrity, Mike Kazim, Elona Dhrami-Gavazi, Christopher Lyons, Pythia Nieuwkerk, Maarten P Mourits
PURPOSE: To assess the change and interrelationship of the field of binocular single vision (BSV) and the quality of life (QoL), tested with two different tools, after one or two strabismus surgeries in patients with Graves' orbitopathy (GO). METHODS: Prospectively, consecutive patients with GO who were scheduled for their first strabismus surgery were recruited from five centres specialized in the treatment of GO. One week preoperatively and 3 months after the last operation, a full ophthalmic and orthoptic examination was performed...
January 30, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28133543/visual-outcomes-quality-of-vision-and-quality-of-life-of-diffractive-multifocal-intraocular-lens-implantation-after-myopic-laser-in-situ-keratomileusis-a-prospective-observational-case-series
#17
John S M Chang, Jack C M Ng, Vincent K C Chan, Antony K P Law
Purpose. To report visual performance and quality of life after implantation of a bifocal diffractive multifocal intraocular lens (MIOL) in postmyopic laser in situ keratomileusis (LASIK) patients. Methods. Prospective, observational case series. Patients with prior myopic LASIK who had implantation of Tecnis ZMA00/ZMB00 MIOL (Abbott Medical Optics) at Hong Kong Sanatorium and Hospital were included. Postoperative examinations included monocular and binocular distance, intermediate and near visual acuity (VA), and contrast sensitivity; visual symptoms (0-5); satisfaction (1-5); spectacle independence rate; and quality of life...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28129416/object-crowding-in-age-related-macular-degeneration
#18
Julian M Wallace, Susana T L Chung, Bosco S Tjan
Crowding, the phenomenon of impeded object identification due to clutter, is believed to be a key limiting factor of form vision in the peripheral visual field. The present study provides a characterization of object crowding in age-related macular degeneration (AMD) measured at the participants' respective preferred retinal loci with binocular viewing. Crowding was also measured in young and age-matched controls at the same retinal locations, using a fixation-contingent display paradigm to allow unlimited stimulus duration...
January 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28123026/noisy-spiking-in-visual-area-v2-of-amblyopic-monkeys
#19
Ye Wang, Bin Zhang, Xiaofeng Tao, Janice M Wensveen, Earl L Smith, Yuzo M Chino
: Interocular decorrelation of input signals in developing visual cortex can cause impaired binocular vision and amblyopia. Although increased intrinsic noise is thought to be responsible for a range of perceptual deficits in amblyopic humans, the neural basis for the elevated perceptual noise in amblyopic primates is not known. Here, we tested the idea that perceptual noise is linked to the neuronal spiking noise (variability) resulting from developmental alterations in cortical circuitry...
January 25, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28116335/evaluation-of-activities-of-daily-living-following-pseudophakic-presbyopic-correction
#20
Georgios Labiris, Panagiota Ntonti, Maria Patsiamanidi, Haris Sideroudi, Kimon Georgantzoglou, Vassilios P Kozobolis
BACKGROUND: Pseudophakic presbyopic correction is among the prevalent methods for regaining near vision capacity. The purpose of this study is to compare the impact of pseudophakic monovision correction and multifocal lens implantation on the performance in a series of activities of daily living (ADL) of presbyopic patients. METHODS: An ADL research framework (10 ADLs) was constructed and validated in a sample of patients divided into three validation groups according to their near visual acuity...
2017: Eye and Vision (London, England)
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