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Binocular vision

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https://www.readbyqxmd.com/read/28431435/regional-extent-of-peripheral-suppression-in-amblyopia
#1
Raiju J Babu, Simon Clavagnier, William R Bobier, Benjamin Thompson, Robert F Hess
Purpose: Previously, we have mapped amblyopic eye suppression within the central 20° of the visual field and observed a gradient of suppression that is strongest in central vision and weakens with increasing eccentricity. In this study, using a large dichoptic display, we extend our novel suppression mapping approach further into the periphery (from 20°-60°) to assess whether suppression continues to decline with eccentricity or plateaus. Methods: Sixteen participants with amblyopia (10 with strabismus, 6 with anisometropia without strabismus; mean age: 37...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28411334/normative-values-for-a-tablet-computer-based-application-to-assess-chromatic-contrast-sensitivity
#2
Lakshmi Bodduluri, Mei Ying Boon, Malcolm Ryan, Stephen J Dain
Tablet computer displays are amenable for the development of vision tests in a portable form. Assessing color vision using an easily accessible and portable test may help in the self-monitoring of vision-related changes in ocular/systemic conditions and assist in the early detection of disease processes. Tablet computer-based games were developed with different levels of gamification as a more portable option to assess chromatic contrast sensitivity. Game 1 was designed as a clinical version with no gaming elements...
April 14, 2017: Behavior Research Methods
https://www.readbyqxmd.com/read/28408039/binocular-measures-of-visual-acuity-and-visual-field-versus-binocular-approximations
#3
David C Musch, Leslie M Niziol, Brenda W Gillespie, Paul R Lichter, Nancy K Janz
PURPOSE: To assess the relationship of binocular visual function tests with binocular approximations using data from the Collaborative Initial Glaucoma Treatment Study (CIGTS). DESIGN: Case series based on existing data from a clinical trial. PARTICIPANTS: Six hundred seven patients with newly diagnosed open-angle glaucoma from the CIGTS. METHODS: Monocular visual field (VF) and visual acuity (VA) tests were performed at baseline and every 6 months thereafter...
April 10, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28407161/preliminary-evidence-of-successful-near-vision-enhancement-with-a-new-technique-presbyopic-allogenic-refractive-lenticule-pearl-corneal-inlay-using-a-smile-lenticule
#4
Soosan Jacob, Dhivya Ashok Kumar, Amar Agarwal, Athiya Agarwal, Ramalingam Aravind, A I Saijimol
PURPOSE: To describe a new technique (PrEsbyopic Allogenic Refractive Lenticule [PEARL] inlay) using an allogenic corneal inlay prepared from a small incision lenticule extraction (SMILE) lenticule. METHODS: A SMILE lenticule of specified thickness (mean: 61.5 ± 3.32 µm) was trephined at the center to 1-mm diameter and implanted in the cornea on the coaxially sighted light reflex under a femtosecond laser-created cap of 120 µm in the nondominant eye of presbyopic patients...
April 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28405481/factors-affecting-contrast-sensitivity-in-healthy-individuals-a-pilot-study
#5
Arzu Seyhan Karatepe, Süheyla Köse, Sait Eğrilmez
OBJECTIVES: To determine the demographic and ocular features affecting contrast sensitivity levels in healthy individuals. MATERIALS AND METHODS: Seventy-four eyes of 37 subjects (7-65 years old) with refractive errors less than 1.0 diopter, no history of ocular surgery, and 20/20 visual acuity were included in the study. The participants were divided by age into three groups: group 1, 7-19 years, n=11; group 2, 20-49 years, n=15; and group 3, 50-65 years, n=11...
April 2017: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28404829/neural-mechanisms-of-oculomotor-abnormalities-in-the-infantile-strabismus-syndrome
#6
Mark M G Walton, Adam C Pallus, Jerome Fleuriet, Michael J Mustari, Kristina Tarczy-Hornoch
Infantile strabismus is characterized by numerous visual and oculomotor abnormalities. Recently non-human primate models of infantile strabismus have been established, with characteristics that closely match those observed in human patients. This has made it possible to study the neural basis for visual and oculomotor symptoms in infantile strabismus. In this review, we consider the available evidence for neural abnormalities in structures related to oculomotor pathways ranging from visual cortex to oculomotor nuclei...
April 12, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28388471/extending-the-stabilized-supralinear-network-model-for-binocular-image-processing
#7
Ben Selby, Bryan Tripp
The visual cortex is both extensive and intricate. Computational models are needed to clarify the relationships between its local mechanisms and high-level functions. The Stabilized Supralinear Network (SSN) model was recently shown to account for many receptive field phenomena in V1, and also to predict subtle receptive field properties that were subsequently confirmed in vivo. In this study, we performed a preliminary exploration of whether the SSN is suitable for incorporation into large, functional models of the visual cortex, considering both its extensibility and computational tractability...
March 18, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28381256/double-or-nothing-red-flag-symptoms-of-critical-carotid-stenosis-a-case-report
#8
José Carlos Morán-Sánchez, Irene Gómez-Estévez, Yasmina El Berdei, José C Gómez-Sánchez, María E Ramos-Araque
BACKGROUND: Detailed knowledge of every possible manifestation of Internal Carotid Artery (ICA) disease is important. For improving detection and a timely adoption of secondary prevention procedures or treatments. Transient oculomotor nerve palsies have been described associated with stenosis or occlusion of the ICA. CASE PRESENTATION: We described a patient that develop a sequential combination of transient monocular loss of vision followed by binocular diplopia secondary to an unstable atherosclerotic preocclusive stenosis of an internal carotid artery previously treated with radiotherapy...
April 5, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28375284/high-precision-method-of-binocular-camera-calibration-with-a-distortion-model
#9
Weimin Li, Siyu Shan, Hui Liu
A high-precision camera calibration method for binocular stereo vision system based on a multi-view template and alternative bundle adjustment is presented in this paper. The proposed method could be achieved by taking several photos on a specially designed calibration template that has diverse encoded points in different orientations. In this paper, the method utilized the existing algorithm used for monocular camera calibration to obtain the initialization, which involves a camera model, including radial lens distortion and tangential distortion...
March 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28366364/efficacy-and-perioperative-timing-of-bromfenac-in-the-management-of-ocular-discomfort-after-femtosecond-laser-assisted-laser%C3%A2-in-situ-keratomileusis
#10
Nathan A Cleaveland, Derek W De Mann, Neil E Carlson, Michael L Keil
PURPOSE: To evaluate the safety, efficacy, and appropriate perioperative timing of the use of topical bromfenac ophthalmic solution 0.07% after femtosecond laser-assisted laser in situ keratomileusis (LASIK). SETTING: Keil LASIK Vision Center, Grand Rapids, Michigan, USA. DESIGN: Prospective case series. METHODS: Ocular discomfort was assessed 1, 2, and 5 hours postoperatively and the following morning using the Ocular Comfort Grading Assessment in patients treated with topical bromfenac 0...
February 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28358960/searching-for-objects-in-everyday-scenes-measuring-performance-in-people-with-dry-age-related-macular-degeneration
#11
Deanna J Taylor, Nicholas D Smith, David P Crabb
Purpose: Treatment success in clinical trials for AMD would ideally be aligned to measurable performance in visual tasks rather than imperceptible changes on clinical charts. We test the hypothesis that patients with dry AMD perform worse than visually healthy peers on computer-based surrogates of "real-world" visual search tasks. Methods: A prospective case-control study was conducted in which patients with dry AMD performed a computer-based "real-world" visual search task...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28355250/avian-binocular-vision-it-s-not-just-about-what-birds-can-see-it-s-also-about-what-they-can-t
#12
Luke P Tyrrell, Esteban Fernández-Juricic
With the exception of primates, most vertebrates have laterally placed eyes. Binocular vision in vertebrates has been implicated in several functions, including depth perception, contrast discrimination, etc. However, the blind area in front of the head that is proximal to the binocular visual field is often neglected. This anterior blind area is important when discussing the evolution of binocular vision because its relative length is inversely correlated with the width of the binocular field. Therefore, species with wider binocular fields also have shorter anterior blind areas and objects along the mid-sagittal plane can be imaged at closer distances...
2017: PloS One
https://www.readbyqxmd.com/read/28350382/a-dataset-of-stereoscopic-images-and-ground-truth-disparity-mimicking-human-fixations-in-peripersonal-space
#13
Andrea Canessa, Agostino Gibaldi, Manuela Chessa, Marco Fato, Fabio Solari, Silvio P Sabatini
Binocular stereopsis is the ability of a visual system, belonging to a live being or a machine, to interpret the different visual information deriving from two eyes/cameras for depth perception. From this perspective, the ground-truth information about three-dimensional visual space, which is hardly available, is an ideal tool both for evaluating human performance and for benchmarking machine vision algorithms. In the present work, we implemented a rendering methodology in which the camera pose mimics realistic eye pose for a fixating observer, thus including convergent eye geometry and cyclotorsion...
March 28, 2017: Scientific Data
https://www.readbyqxmd.com/read/28346616/unilateral-amblyopia-affects-two-eyes-fellow-eye-deficits-in-amblyopia
#14
Kimberly Meier, Deborah Giaschi
Unilateral amblyopia is a visual disorder that arises after selective disruption of visual input to one eye during critical periods of development. In the clinic, amblyopia is understood as poor visual acuity in an eye that was deprived of pattern vision early in life. By its nature, however, amblyopia has an adverse effect on the development of a binocular visual system and the interactions between signals from two eyes. Visual functions aside from visual acuity are impacted, and many studies have indicated compromised sensitivity in the fellow eye even though it demonstrates normal visual acuity...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28343723/-the-search-for-electrophysiological-predictors-of-visual-comfort-after-presbyopia-correction-with-contact-lenses
#15
A El Ameen, S Majzoub, P-J Pisella
Starting at 40 years of age, prespyopia affects a quarter of the world population. Many techniques of presbyopia surgery have emerged in recent years. The purpose of this study was to compare monovision and multifocality and to identify clinical and electrophysiological predictive markers of visual comfort for each correction available in clinical practice. Ten presbyopic patients participated in this study. Patients received monovision and multifocal correction using contact lenses for three weeks each in a random order...
April 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28336221/the-use-of-contact-lens-telescopic-systems-in-low-vision-rehabilitation
#16
REVIEW
Stephen J Vincent
Refracting telescopes are afocal compound optical systems consisting of two lenses that produce an apparent magnification of the retinal image. They are routinely used in visual rehabilitation in the form of monocular or binocular hand held low vision aids, and head or spectacle-mounted devices to improve distance visual acuity, and with slight modifications, to enhance acuity for near and intermediate tasks. Since the advent of ground glass haptic lenses in the 1930's, contact lenses have been employed as a useful refracting element of telescopic systems; primarily as a mobile ocular lens (the eyepiece), that moves with the eye...
March 20, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28336059/progression-of-near-vision-loss-and-incidence-of-near-vision-impairment-in-an-adult-chinese-population
#17
Xiaotong Han, Leon B Ellwein, Xinxing Guo, Yin Hu, William Yan, Mingguang He
PURPOSE: To investigate the progression of near vision loss and the cumulative incidence of near vision impairment (NVI) 6 years after initial examination of an urban Chinese cohort. DESIGN: Population-based, prospective cohort study. PARTICIPANTS: People aged ≥35 years examined at baseline in the Yuexiu District of Guangzhou, China. METHODS: Participants examined at baseline were invited for 2-year and 6-year follow-up examinations in 2010 and 2014, respectively...
May 2017: Ophthalmology
https://www.readbyqxmd.com/read/28327351/parkinson-s-patients-can-rely-on-perspective-cues-to-perceive-3d-space
#18
Alexandra Séverac Cauquil, Fabienne Ory-Magne, Vincent Jardiné, Monique Galitzky, Maxime Rosito, Christine Brefel-Courbon, Simona Celebrini
3D perception, which is necessary for an optimal navigation in our environment, relies on 2 complementary kinds of cues; binocular cues allowing precise depth localization near the point of visual interest and monocular ones that are necessary for correct global perception of visual space. Recent studies described deficient binocular 3D vision in PD patients; here we tested 3D vision in PD patients when based on monocular cues (m3D). Sixteen PD patients and 16 controls had to categorize visual stimuli as perceived in 2D (flat) or 3D (with depth)...
March 18, 2017: Brain Research
https://www.readbyqxmd.com/read/28325621/-diplopia-an-important-symptom-in-internal-medicine
#19
S Bidot, V Biousse
Diplopia is defined as "double vision" when looking at a single object. Monocular diplopia is related to an ocular disorder and must be differentiated from binocular diplopia which is secondary to ocular misalignment. The examination of the patient with binocular diplopia is often challenging for non-specialists. However, a careful and systematic clinical examination followed by targeted ancillary testing allows the clinician to localize the lesion along the oculomotor pathways. The lesion may involve the brainstem, the ocular motor nerves III, IV or VI, the neuromuscular junction, the extraocular ocular muscles, or the orbit...
March 18, 2017: La Revue de Médecine Interne
https://www.readbyqxmd.com/read/28323148/results-of-combined-resection-recession-on-a-single-rectus-muscle-for-incomitant-deviations-an-alternative-to-the-posterior-fixation-suture
#20
Gill Roper-Hall, Oscar A Cruz
PURPOSE: To compare outcomes of combined resection and recession on previously unoperated single horizontal or vertical rectus muscles in consecutive adult patients with acquired incomitant deviations minimal in primary gaze and maximal in an eccentric gaze position. METHODS: The surgical goal was to decrease the incomitance by 50%, expand the field of binocular single vision, and relieve diplopia. Recessions for the maximal deviations were combined with smaller resections using hang-back, nonadjustable sutures...
April 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
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