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Binocular vision

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https://www.readbyqxmd.com/read/29454106/binocular-vision-adaptively-suppresses-delayed-monocular-signals
#1
Bruno Richard, Eva Chadnova, Daniel H Baker
A neutral density filter placed before one eye will produce a dichoptic imbalance in luminance, which attenuates responses to visual stimuli and lags neural signals from retina to cortex in the filtered eye. When stimuli are presented to both the filtered and unfiltered eye (i.e., binocularly), neural responses show little attenuation and no lag compared with their baseline counterpart. This suggests that binocular visual mechanisms must suppress the attenuated and delayed input from the filtered eye; however, the mechanisms involved remain unclear...
February 14, 2018: NeuroImage
https://www.readbyqxmd.com/read/29451999/evaluation-of-the-effects-of-the-occlu-pad-for-the-management-of-anisometropic-amblyopia-in-children
#2
Yo Iwata, Tomoya Handa, Hitoshi Ishikawa, Toshiaki Goseki, Nobuyuki Shoji
PURPOSE: In recent years, amblyopia treatment device that can be used with both eyes open have been reported. The Occlu-pad is a device that can present images of tablet terminals to one eye only under binocular open conditions. Till date, no study has reported the effectiveness of Occlu-pad training for anisometropic amblyopia in a series of cases. In the present study, we evaluated the effectiveness of the Occlu-pad for the management of anisometropic amblyopia without the use of occlusion therapy (eyepatch)...
February 16, 2018: Current Eye Research
https://www.readbyqxmd.com/read/29450383/eyesight-quality-and-computer-vision-syndrome
#3
Camelia Margareta Bogdănici, Diana Elena Săndulache, Corina Andreea Nechita
The aim of the study was to analyze the effects that gadgets have on eyesight quality. A prospective observational study was conducted from January to July 2016, on 60 people who were divided into two groups: Group 1 - 30 middle school pupils with a mean age of 11.9 ± 1.86 and Group 2 - 30 patients evaluated in the Ophthalmology Clinic, "Sf. Spiridon" Hospital, Iași, with a mean age of 21.36 ± 7.16 years. The clinical parameters observed were the following: visual acuity (VA), objective refraction, binocular vision (BV), fusional amplitude (FA), Schirmer's test...
April 2017: Romanian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29445760/corneal-functional-optical-zone-under-monocular-and-binocular-assessment
#4
Samuel Arba Mosquera, Diego de Ortueta, Shwetabh Verma
Background: In this retrospective randomized case series, we compared bilateral symmetry between OD and OS eyes, intercorneal differences and Functional Optical Zone (FOZ) of the corneal aberrations. Methods: Sixty-seven normal subjects (with no ocular pathology) who never had any ocular surgery were bilaterally evaluated at Augenzentrum Recklinghausen (Germany). In all cases, standard examinations and corneal wavefront topography (OPTIKON Scout) were performed...
2018: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/29442555/direct-intertectal-inputs-are-an-integral-component-of-the-bilateral-sensorimotor-circuit-for-behavior-in-xenopus-tadpoles
#5
Abigail C Gambrill, Regina L Faulkner, Hollis T Cline
The circuit controlling visually-guided behavior in non-mammalian vertebrates, like Xenopus tadpoles, includes retinal projections to the contralateral optic tectum, where visual information is processed, and tectal motor outputs projecting ipsilaterally to hindbrain and spinal cord. Tadpoles have an intertectal commissure whose function is unknown, but it might transfer information between the tectal lobes. Differences in visual experience between the two eyes have profound effects on the development and function of visual circuits in animals with binocular vision, but the effects on animals with fully-crossed retinal projections are not clear...
February 14, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29429297/-preliminary-study-on-reading-speed-test-with-irest-for-normally-sighted-young-chinese-readers
#6
Q H Wang, X T Ren, J Hu, Q Li, S S Cui, Y Y Zou
Objective: To assess the reading speed of normally-sighted young Chinese with the International Reading Speed Texts (IReST) Chinese version, and evaluate the normal range of the texts, the equivalence of the ten different texts and the potential clinical value. Methods: Evaluation of diagnostic techniques. Participants aged 18 to 35 years old with junior high school or above education and best corrected visual acuity no less than 0.6 were recruited. Best corrected visions of both eyes and binocular vision were tested, and ocular and nervous system diseases were excluded with slit-lamp microscope and funduscope...
February 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29423423/rapid-reversal-of-complete-binocular-blindness-with-high-dose-corticosteroids-and-lumbar-drain-in-a-solid-organ-transplant-recipient-with-cryptococcal-meningitis-and-immune-reconstitution-syndrome-first-case-study-and-literature-review
#7
Zoe Weiss, Nihaal Mehta, Su Nandar Aung, Michael Migliori, Dimitrios Farmakiotis
Blindness is a rare, devastating, usually permanent complication of cryptococcal meningitis (CM). We present the first case of complete vision loss in a solid organ transplant recipient with CM treated with placement of a lumbar drain who had a dramatic visual recovery that started after 3 doses of high-dose steroids.
February 2018: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/29422686/binocular-vision-in-the-total-situation
#8
Christo Joannidis
This paper investigates the concept of "total situation" which, even though introduced into psychoanalytic thinking via sister disciplines, such as sociology, the neurosciences, etc., has gradually acquired a relatively prominent position in current therapeutic practice. It is used as a metaphor for the envelopment of the unfolding transferential and related events in the analytic process. Irrespective of whether one focuses on the individual analytic condition or the group-analytic one, contemporary psychoanalytic perspectives include both the bi-personal unconscious interactions and the various levels of the total situation in their conceptualizations of the nature of the process...
February 8, 2018: American Journal of Psychoanalysis
https://www.readbyqxmd.com/read/29392642/impairment-of-acquired-color-vision-in-multiple-sclerosis-an-early-diagnostic-sign-linked-to-the-greatness-of-disease
#9
Anna Piro, Antonio Tagarelli, Giuseppe Nicoletti, Sara Scannapieco, Serena Polidoro, Paola Valentino, Aldo Quattrone
OBJECTIVE: To assess the type and degree of both red-green and blue-yellow color vision deficiencies of Calabrian males affected by multiple sclerosis. MATERIAL: Eighty Calabrian male patients were enrolled (age range 18-70 years; mean age 40.6 ± 12.4 years) showing a disease duration mean of 10.6 ± 8.2 years (range = 0.5-46 years) coming from the Institute of Neurology, Magna Graecia University, Catanzaro. Optic neuritis present in the medical histories of the 21 patients does not influence color vision...
February 1, 2018: International Ophthalmology
https://www.readbyqxmd.com/read/29390295/management-of-a-neurotrophic-deep-corneal-ulcer-with-amniotic-membrane-transplantation-in-a-patient-with-functional-monocular-vision-a-case-report
#10
Tobias Röck, Karl Ulrich Bartz-Schmidt, Daniel Röck
RATIONALE: Amniotic membrane transplantation (AMT) has been performed therapeutically in humans for over 100 years. In recent 2 decades AMTs have been used increasingly and successfully to treat various types of ophthalmic indications. PATIENT CONCERNS: An 83-year-old man was referred to our eye hospital with a refractory neurotrophic deep corneal ulcer of the left eye. DIAGNOSES: The best-corrected visual acuity of the left eye was 0.5 (0...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29383261/case-report-of-a-patient-with-one-and-a-half-plus-syndrome-nine-syndrome
#11
Muhammad Uthman, Mehreen Kamran
This case talks about 'One-and-a-half plus syndrome', a clinical syndrome affecting binocular vision and facial nerve. One-and-a-half plus syndrome is a less known clinical syndrome which constitutes of a conjugate horizontal gaze palsy in one direction and an internuclear ophthalmoplegia in the other direction. Despite the known association between ischemia, autoimmune disorders, multiple sclerosis, with mono neuritis multiplex resulting in extra ocular movement disorder, one-and-a-half plus syndrome is rarely considered in the differential diagnosis of eye ball movement disorders, as many clinicians are not able to diagnose such a case as ' the eyes don't see what the mind doesn't know'...
January 2018: Oxford Medical Case Reports
https://www.readbyqxmd.com/read/29379869/layer-specific-developmental-changes-in-excitation-and-inhibition-in-rat-primary-visual-cortex
#12
Roberta Tatti, Olivia K Swanson, Melinda S E Lee, Arianna Maffei
Cortical circuits are profoundly shaped by experience during postnatal development. The consequences of altered vision during the critical period for ocular dominance plasticity have been extensively studied in rodent primary visual cortex (V1). However, little is known about how eye opening, a naturally occurring event, influences the maturation of cortical microcircuits. Here we used a combination of slice electrophysiology and immunohistochemistry in rat V1 to ask whether manipulating the time of eye opening for 3 or 7 d affects cortical excitatory and inhibitory synaptic transmission onto excitatory neurons uniformly across layers or induces laminar-specific effects...
November 2017: ENeuro
https://www.readbyqxmd.com/read/29371010/the-discrepancy-between-subjective-and-objective-measures-of-convergence-insufficiency-in-whiplash-associated-disorder-versus-control-participants
#13
Hadas Stiebel-Kalish, Amir Amitai, Michael Mimouni, Michael Bach, Tal Saban, Michelle Cahn, Liat Gantz
PURPOSE: Motor vehicle accidents (MVAs) are a pandemic associated with human suffering and a burden to national economies. Whiplash-associated disorders (WADs) after MVAs are associated commonly with disability claims, many of which are related to vision. Convergence insufficiency (CI) leads to visual disability associated with symptoms of ocular discomfort. We examined the incidence of symptoms and findings consistent with CI in a cohort of patients after MVA-related WAD compared with age-matched control participants...
January 19, 2018: Ophthalmology
https://www.readbyqxmd.com/read/29362998/cancer-associated-retinopathy-after-surgery-for-breast-cancer-a-case-report-and-review-of-the-literature
#14
Mirei Kamei, Yutaka Fujitomi, Yoshiyuki Kondo, Toru Adachi, Kohei Shibata, Yohei Takumi, Miyuki Abe, Kenji Sugio
We herein report a 50-year-old Japanese woman with breast cancer who complained of blurred vision and central scotoma in her left eye on the 12th day after surgery. Subsequently, the sudden-onset binocular visual disorder progressed, and she was diagnosed with cancer-associated retinopathy (CAR) based on the clinical findings. Although her visual acuity temporarily improved following the start of adjuvant chemotherapy, reductions in her visual acuity progressed once again. After two courses of steroid pulse therapy initiated from the 59th day following the onset of CAR, although her visual field was still constricted, her binocular visual acuity improved from finger movement to 0...
January 23, 2018: Surgical Case Reports
https://www.readbyqxmd.com/read/29362804/interocular-correlation-sensitivity-and-its-relationship-with-stereopsis
#15
Alexandre Reynaud, Robert F Hess
Stereoscopic vision uses the disparity between the images received by the two eyes to derive three-dimensional estimates. Here, we were interested in providing a measure of the strength of binocular vision alternate to disparity processing. In particular, we wanted to assess the spatial dependence of sensitivity to detect interocular correlation (IOC). Thus we designed dichoptic stimuli composed of bandpass textures whose IOC is sinusoidally modulated at different correlation frequencies and compared sensitivity to these stimuli to that of analogous stimuli modulated in disparity...
January 1, 2018: Journal of Vision
https://www.readbyqxmd.com/read/29344823/long-term-visual-outcomes-of-craniopharyngioma-in-children
#16
Michael J Wan, Michal Zapotocky, Eric Bouffet, Ute Bartels, Abhaya V Kulkarni, James M Drake
Visual function is a critical factor in the diagnosis, monitoring, and prognosis of craniopharyngiomas in children. The aim of this study was to report the long-term visual outcomes in a cohort of pediatric patients with craniopharyngioma. The study design is a retrospective chart review of craniopharyngioma patients from a single tertiary-care pediatric hospital. 59 patients were included in the study. Mean age at presentation was 9.4 years old (range 0.7-18.0 years old). The most common presenting features were headache (76%), nausea/vomiting (32%), and vision loss (31%)...
January 17, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29333910/soft-contact-lenses-to-optimize-vision-in-adults-with-idiopathic-infantile-nystagmus-a-pilot-parallel-randomized-controlled-trial
#17
Maria Theodorou, Ana Quartilho, Wen Xing, Catey Bunce, Gary Rubin, Gillian Adams, Annegret Dahlmann-Noor
PURPOSE: The optimal management of infantile nystagmus syndrome (INS) is still unclear. Contact lenses (CL) may be superior to glasses in improving visual function in INS but it is not known whether their beneficial effects are due to optical correction alone, or to an additional proprioceptive effect, and whether soft CLs would be as effective as rigid CLs. There is little data on feasibility and and the present study aimed to provide this information. METHODS: We completed a pilot Randomized Control Trial (RCT) at a single tertiary referral centre in London, UK...
January 15, 2018: Strabismus
https://www.readbyqxmd.com/read/29332124/optimal-audiovisual-integration-in-the-ventriloquism-effect-but-pervasive-deficits-in-unisensory-spatial-localization-in-amblyopia
#18
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/29329240/effective-data-driven-calibration-for-a-galvanometric-laser-scanning-system-using-binocular-stereo-vision
#19
Junchao Tu, Liyan Zhang
A new solution to the problem of galvanometric laser scanning (GLS) system calibration is presented. Under the machine learning framework, we build a single-hidden layer feedforward neural network (SLFN)to represent the GLS system, which takes the digital control signal at the drives of the GLS system as input and the space vector of the corresponding outgoing laser beam as output. The training data set is obtained with the aid of a moving mechanism and a binocular stereo system. The parameters of the SLFN are efficiently solved in a closed form by using extreme learning machine (ELM)...
January 12, 2018: Sensors
https://www.readbyqxmd.com/read/29325382/-knapp-procedure-and-modified-knapp-procedure-with-foster-suture-for-the-treatment-of-double-elevator-palsy
#20
Y P Li, W Zhang, J Ding, H Z Ma, K X Zhao
Objective: To investigate the efficacy of Knapp procedure and modified Knapp procedure with Foster suture in the treatment of double elevator palsy(DEP). Methods: Retrospective study. Twenty-two patients with congenital DEP were underwent Knapp procedure (n=15) and modified Knapp procedure(n=7). The clinical data were retrospectively analyzed, including the preoperative and postoperative vertical deviation in the primary position, ocular motility, and binocular vision. Results: The average vertical deviation in the primary position was (34...
December 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
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