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https://www.readbyqxmd.com/read/29667039/perception-of-time-to-contact-of-slow-and-fast-moving-objects-using-monocular-and-binocular-motion-information
#1
Aaron J Fath, Mats Lind, Geoffrey P Bingham
The role of the monocular-flow-based optical variable τ in the perception of the time to contact of approaching objects has been well-studied. There are additional contributions from binocular sources of information, such as changes in disparity over time (CDOT), but these are less understood. We conducted an experiment to determine whether an object's velocity affects which source is most effective for perceiving time to contact. We presented participants with stimuli that simulated two approaching squares...
April 17, 2018: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/29666633/the-eeg-activity-during-binocular-depth-perception-of-2d-images
#2
Marsel Fazlyyyakhmatov, Nataly Zwezdochkina, Vladimir Antipov
The central brain functions underlying a stereoscopic vision were a subject of numerous studies investigating the cortical activity during binocular perception of depth. However, the stereo vision is less explored as a function promoting the cognitive processes of the brain. In this work, we investigated a cortical activity during the cognitive task consisting of binocular viewing of a false image which is observed when the eyes are refocused out of the random-dot stereogram plane (3D phenomenon). The power of cortical activity before and after the onset of the false image perception was assessed using the scull EEG recording...
2018: Computational Intelligence and Neuroscience
https://www.readbyqxmd.com/read/29660563/exploring-the-functional-nature-of-synaesthetic-colour-dissociations-from-colour-perception-and-imagery
#3
Rocco Chiou, Anina N Rich, Sebastian Rogers, Joel Pearson
Individuals with grapheme-colour synaesthesia experience anomalous colours when reading achromatic text. These unusual experiences have been said to resemble 'normal' colour perception or colour imagery, but studying the nature of synaesthesia remains difficult. In the present study, we report novel evidence that synaesthetic colour impacts conscious vision in a way that is different from both colour perception and imagery. Presenting 'normal' colour prior to binocular rivalry induces a location-dependent suppressive bias reflecting local habituation...
April 12, 2018: Cognition
https://www.readbyqxmd.com/read/29657974/monocular-and-binocular-visual-impairment-in-the-uk-biobank-study-prevalence-associations-and-diagnoses
#4
Martin McKibbin, Tracey M Farragher, Darren Shickle
Objective: To determine the prevalence of, associations with and diagnoses leading to mild visual impairment or worse (logMAR >0.3) in middle-aged adults in the UK Biobank study. Methods and analysis: Prevalence estimates for monocular and binocular visual impairment were determined for the UK Biobank participants with fundus photographs and spectral domain optical coherence tomography images. Associations with socioeconomic, biometric, lifestyle and medical variables were investigated for cases with visual impairment and matched controls, using multinomial logistic regression models...
2018: BMJ Open Ophthalmology
https://www.readbyqxmd.com/read/29657434/inventory-of-lice-of-mammals-and-farmyard-chicken-in-north-eastern-algeria
#5
Mohamed Nadir Meguini, Souad Righi, Fayçal Zeroual, Khelaf Saidani, Ahmed Benakhla
Background and Aim: Lice are permanent ectoparasites, extremely specific to their hosts. Their great importance in veterinary medicine remain significant, they can cause their direct pathogenic actions like irritability, dermatitis, anemia, decreased weight gain, and milk production. The purpose of this work was to made the first time an inventory of mammalian lice in North-eastern Algeria. Materials and Methods: Our survey of lice infestation was conducted on several animal species from five provinces of North-eastern Algeria...
March 2018: Veterinary World
https://www.readbyqxmd.com/read/29652210/idiopathic-central-nervous-system-inflammatory-disease-in-the-setting-of-hla-b27-uveitis
#6
Eric L Crowell, Margaret L Pfeiffer, Ankur A Kamdar, Mary K Koenig, Susan E Wittenberg, Emilio P Supsupin, Ore-Ofe O Adesina
PURPOSE: The purpose of the article is to describe a novel case of idiopathic central nervous system inflammatory disease with bilateral human leukocyte antigen (HLA)-B27-positive anterior uveitis. METHODS/RESULTS: A 15-year-old African American boy with bilateral HLA-B27-positive anterior uveitis controlled with topical and oral steroids for 8 months acutely developed headaches, left eyelid ptosis, and binocular diplopia. Imaging showed lesions in the right midbrain, superior colliculus, cerebellar peduncles, and cerebellar vermis and leptomeningeal enhancement along the vermian foliae...
April 13, 2018: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/29649796/visual-field-variability-after-gene-therapy-for-leber-s-hereditary-optic-neuropathy
#7
Jia-Jia Yuan, Yong Zhang, Li-Ling Wang, Ming-Shi Cheng, Si-Qi Ma, Qin Gao, Bin Li
PURPOSE: To assess changes in visual field (VF) values after gene therapy for Leber's hereditary optic neuropathy (LHON). METHODS: VF recovery, VF indices, and mean deviation in injected and uninjected eyes, before and after gene therapy, were examined in 2 groups of patients according to disease duration (≤2 years and > 2 years). Nine patients with LHON were treated by monocular intravitreal injection of AAV2-ND4. Finally, 7 patients were considered for subsequent comparisons; the first and second eyes were treated separately...
April 12, 2018: Ophthalmic Research
https://www.readbyqxmd.com/read/29649652/differentiating-aversive-conditioning-in-bistable-perception-avoidance-of-a-percept-vs-salience-of-a-stimulus
#8
Gregor Wilbertz, Philipp Sterzer
Alternating conscious visual perception of bistable stimuli is influenced by several factors. In order to understand the effect of negative valence, we tested the effect of two types of aversive conditioning on dominance durations in binocular rivalry. Participants received either aversive classical conditioning of the stimuli shown alone between rivalry blocks, or aversive percept conditioning of one of the two possible perceptual choices during rivalry. Both groups showed successful aversive conditioning according to skin conductance responses and affective valence ratings...
April 9, 2018: Consciousness and Cognition
https://www.readbyqxmd.com/read/29643027/-purtscher-like-retinopathy-associated-with-antibiotic-anaphylaxis
#9
Zhi-Xuan Huang, Zhi-Bing Zeng, Zhu-Ping Xu
We report a case of an 18-year-old woman with systemic antibiotic anaphylaxis who presented anasarca and bilateral visual loss two weeks after the intravenous use of pazufloxacin. Ancillary fundus tests revealed bilateral cotton-wool spots, Purtscher flecken, edema, and retinal arteriolar occlusion around the optic disc. After pulse corticosteroid, administration of anti-anaphylactic agent, and general support therapy for one month, the patient showed a favorable change, with the symptoms lessened or free systemically, except the continuous aggravation of fundus ischemic change...
March 20, 2018: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/29625469/a-novel-visual-psychometric-test-for-light-induced-discomfort-using-red-and-blue-light-stimuli-under-binocular-and-monocular-viewing-conditions
#10
Marija Zivcevska, Shaobo Lei, Alan Blakeman, Herbert C Goltz, Agnes M F Wong
Purpose: To develop an objective psychophysical method to quantify light-induced visual discomfort, and to measure the effects of viewing condition and stimulus wavelength. Methods: Eleven visually normal subjects participated in the study. Their pupils were dilated (2.5% phenylephrine) before the experiment. A Ganzfeld system presented either red (1.5, 19.1, 38.2, 57.3, 76.3, 152.7, 305.3 cd/m2) or blue (1.4, 7.1, 14.3, 28.6, 42.9, 57.1, 71.4 cd/m2) randomized light intensities (1 s each) in four blocks...
March 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29625442/improved-binocular-outcomes-following-binocular-treatment-for-childhood-amblyopia
#11
Krista R Kelly, Reed M Jost, Yi-Zhong Wang, Lori Dao, Cynthia L Beauchamp, Joel N Leffler, Eileen E Birch
Purpose: Childhood amblyopia can be treated with binocular games or movies that rebalance contrast between the eyes, which is thought to reduce depth of interocular suppression so the child can experience binocular vision. While visual acuity gains have been reported following binocular treatment, studies rarely report gains in binocular outcomes (i.e., stereoacuity, suppression) in amblyopic children. Here, we evaluated binocular outcomes in children who had received binocular treatment for childhood amblyopia...
March 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29621387/diagnostic-accuracy-of-ophthalmoscopy-vs-telemedicine-in-examinations-for-retinopathy-of-prematurity
#12
Hilal Biten, Travis K Redd, Chace Moleta, J Peter Campbell, Susan Ostmo, Karyn Jonas, R V Paul Chan, Michael F Chiang
Importance: Examinations for retinopathy of prematurity (ROP) are typically performed using binocular indirect ophthalmoscopy. Telemedicine studies have traditionally assessed the accuracy of telemedicine compared with ophthalmoscopy as a criterion standard. However, it is not known whether ophthalmoscopy is truly more accurate than telemedicine. Objective: To directly compare the accuracy and sensitivity of ophthalmoscopy vs telemedicine in diagnosing ROP using a consensus reference standard...
April 5, 2018: JAMA Ophthalmology
https://www.readbyqxmd.com/read/29621384/binocular-summation-for-reflexive-eye-movements
#13
Christian Quaia, Lance M Optican, Bruce G Cumming
Psychophysical studies and our own subjective experience suggest that, in natural viewing conditions (i.e., at medium to high contrasts), monocularly and binocularly viewed scenes appear very similar, with the exception of the improved depth perception provided by stereopsis. This phenomenon is usually described as a lack of binocular summation. We show here that there is an exception to this rule: Ocular following eye movements induced by the sudden motion of a large stimulus, which we recorded from three human subjects, are much larger when both eyes see the moving stimulus, than when only one eye does...
April 1, 2018: Journal of Vision
https://www.readbyqxmd.com/read/29619883/clinical-outcomes-with-a-diffractive-trifocal-intraocular-lens
#14
Jorge L Alió, Ana B Plaza-Puche, Jorge L Alió Del Barrio, Pedro Amat-Peral, Vicente Ortuño, Pilar Yébana, Olena Al-Shymali, Alfredo Vega-Estrada
PURPOSE: To evaluate clinical and visual outcomes, quality of near vision, and intraocular optical quality of patients bilaterally implanted with a trifocal PanOptix intraocular lens. METHODS: In this prospective consecutive case-series study, 52 eyes of 26 bilateral patients (mean age, 60.2 ± 7.4 years) were implanted with the AcrySof IQ Panoptix intraocular lens. Visual acuity, defocus curve, contrast sensitivity (Pelli-Robson test), near activity visual questionnaire, and internal aberrations with Osiris were evaluated...
March 1, 2018: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/29617293/wide-baseline-stereo-based-obstacle-mapping-for-unmanned-surface-vehicles
#15
Xiaozheng Mou, Han Wang
This paper proposes a wide-baseline stereo-based static obstacle mapping approach for unmanned surface vehicles (USVs). The proposed approach eliminates the complicated calibration work and the bulky rig in our previous binocular stereo system, and raises the ranging ability from 500 to 1000 m with a even larger baseline obtained from the motion of USVs. Integrating a monocular camera with GPS and compass information in this proposed system, the world locations of the detected static obstacles are reconstructed while the USV is traveling, and an obstacle map is then built...
April 4, 2018: Sensors
https://www.readbyqxmd.com/read/29614155/binocular-benefits-of-optical-treatment-in-anisometropic-amblyopia
#16
Jiafeng Wang, Lixia Feng, Yonghua Wang, Jiawei Zhou, Robert F Hess
In this study, we investigated the effect of optical treatment on sensory eye balance in anisometropic amblyopia. Fourteen individuals (age: 13.7 ± 8.4 years old) with previously untreated anisometropic amblyopia were enrolled in the study. The average magnitude of their anisometropia (spherical equivalent) was 4.02 ± 1.19 DS. Their best corrected monocular visual acuity and sensory eye balance were measured before and after a 2-month period of full refractive correction (i.e., our optical treatment). Spectacle-corrected distance visual acuity (at 5 m) was measured monocularly using the Tumbling E Chart...
April 1, 2018: Journal of Vision
https://www.readbyqxmd.com/read/29614028/semantic-edge-based-disparity-estimation-using-adaptive-dynamic-programming-for-binocular-sensors
#17
Dongchen Zhu, Jiamao Li, Xianshun Wang, Jingquan Peng, Wenjun Shi, Xiaolin Zhang
Disparity calculation is crucial for binocular sensor ranging. The disparity estimation based on edges is an important branch in the research of sparse stereo matching and plays an important role in visual navigation. In this paper, we propose a robust sparse stereo matching method based on the semantic edges. Some simple matching costs are used first, and then a novel adaptive dynamic programming algorithm is proposed to obtain optimal solutions. This algorithm makes use of the disparity or semantic consistency constraint between the stereo images to adaptively search parameters, which can improve the robustness of our method...
April 3, 2018: Sensors
https://www.readbyqxmd.com/read/29606378/the-globe-s-eccentric-rotational-axis-why-medial-rectus-surgery-is-more-potent-than-lateral-rectus-surgery
#18
Robert A Clark, Joseph L Demer
PURPOSE: Tables typically recommend greater lateral rectus (LR) than medial rectus (MR) surgical doses for horizontal strabismus of any given magnitude, a difference unexplained by mechanical models that assume globe rotation about its center. We tested this assumption during horizontal ductions. DESIGN: Prospective observational study. PARTICIPANTS: Eighteen adult subjects with normal binocular vision. METHODS: Surface coil magnetic resonance imaging at 390 or 430 μm resolution was obtained using 2-mm-thick contiguous axial planes while subjects fixated targets in central, right, and left gaze...
March 29, 2018: Ophthalmology
https://www.readbyqxmd.com/read/29604008/three-dimensional-facial-digitization-using-advanced-digital-image-correlation
#19
Hieu Nguyen, Hien Kieu, Zhaoyang Wang, Hanh N D Le
Presented in this paper is an effective technique to acquire the three-dimensional (3D) digital images of the human face without the use of active lighting and artificial patterns. The technique is based on binocular stereo imaging and digital image correlation, and it includes two key steps: camera calibration and image matching. The camera calibration involves a pinhole model and a bundle-adjustment approach, and the governing equations of the 3D digitization process are described. For reliable pixel-to-pixel image matching, the skin pores and freckles or lentigines on the human face serve as the required pattern features to facilitate the process...
March 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/29603929/perceptual-resolution-of-color-for-multiple-chromatically-ambiguous-objects
#20
Emily Slezak, Steven K Shevell
In a classic study, Kovács et al. [Proc. Natl. Acad. Sci. USA93, 15508 (1996)PNASA60027-842410.1073/pnas.93.26.15508] used an array of many disks presented dichoptically with half of the disks in one eye "red" and the other half "green;" disk chromaticities in the fellow eye were reversed, resulting in binocular color rivalry for every disk, thus creating color ambiguity. Surprisingly, the binocularly fused percept sometimes was all disks of the same color (red or green), which showed that perceptual resolution of the many ambiguous neural representations did not rely completely on monocular dominance or on independent resolution for each disk...
April 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
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