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Binocular vision

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https://www.readbyqxmd.com/read/29048021/3d-pose-estimation-of-large-and-complicated-workpieces-based-on-binocular-stereo-vision
#1
Zhifeng Luo, Ke Zhang, Zhigang Wang, Jian Zheng, Yixin Chen
A binocular stereo vision method is proposed for automatically locating the position and posture of workpieces, which is especially important when processing large, complicated structures, for example, the laser hardening and laser cladding of automotive die. First, a binocular stereo vision positioning system was designed and modeled, from which a method of background subtraction was proposed to extract the edge line of the foreground area. Furthermore, the intersection point of the workpiece contour line was taken as the characteristic point of the workpiece, and an algorithm that combines epipolar constraint with gray value similarity was proposed to quickly and accurately realize the feature points matching...
August 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047884/optimization-based-non-cooperative-spacecraft-pose-estimation-using-stereo-cameras-during-proximity-operations
#2
Limin Zhang, Feng Zhu, Yingming Hao, Wang Pan
Pose estimation for spacecraft is widely recognized as an important technology for space applications. Many space missions require accurate relative pose between the chaser and the target spacecraft. Stereo-vision is a usual mean to estimate the pose of non-cooperative targets during proximity operations. However, the uncertainty of stereo-vision measurement is still an outstanding issue that needs to be solved. With binocular structure and the geometric structure of the object, we present a robust pose estimation method for non-cooperative spacecraft...
May 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29033538/comparison-of-a-hydrogel-corneal-inlay-and-monovision-laser-in-situ-keratomileusis-in-presbyopic-patients-focus-on-visual-performance-and-optical-quality
#3
Cornelis Verdoorn
PURPOSE: To compare the visual performance and optical quality after Raindrop Near Vision Inlay implantation or monovision LASIK for the correction of presbyopia. MATERIALS AND METHODS: In this retrospective case-series study, patients previously treated in the nondominant eye with monovision LASIK were compared with patients previously implanted with Raindrop Near Vision Inlay. The study enrolled 16 inlay and 15 monovision LASIK patients. Uncorrected near visual acuity, uncorrected distance visual acuity, binocular stereopsis, patient satisfaction, and patient task performance were assessed...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29033061/predicting-vision-related-disability-in-glaucoma
#4
Ricardo Y Abe, Alberto Diniz-Filho, Vital P Costa, Zhichao Wu, Felipe A Medeiros
PURPOSE: To present a new methodology for investigating predictive factors associated with development of vision-related disability in glaucoma. DESIGN: Prospective, observational cohort study. PARTICIPANTS: Two hundred thirty-six patients with glaucoma followed up for an average of 4.3±1.5 years. METHODS: Vision-related disability was assessed by the 25-item National Eye Institute Visual Function Questionnaire (NEI VFQ-25) at baseline and at the end of follow-up...
October 12, 2017: Ophthalmology
https://www.readbyqxmd.com/read/29025170/-the-motor-development-of-children-with-infantile-esotropia
#5
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/29025168/-a-model-explaining-infantile-esotropia-dissociated-strabismus-as-a-result-of-sensory-interhemispheric-dissociation-and-crossed-dominance-in-the-brainstem
#6
Marcel Paulus Ten Tusscher
Over 150 million years, modern reptiles, birds and mammals evolved. Predatory birds and mammals have eyes on the front of their heads. In these animals, binocular correspondence, voluntary eye movements, eye-hand coordination, partial decussation at the optic chiasm and cortical interhemispheric pathways could develop at the cost of a smaller visual field. The subsequent enlargement of the cerebral neocortex and the hemispheric pathways are of central importance in binocular vision, sensory fusion and infantile strabismus...
October 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28993094/characterization-of-diplopia-in-non-demented-patients-with-parkinson-s-disease
#7
Katharina A Schindlbeck, Shideh Schönfeld, Wanda Naumann, David J Friedrich, André Maier, Charlotte Rewitzer, Fabian Klostermann, Frank Marzinzik
INTRODUCTION: Although diplopia is considered a frequent symptom of Parkinson's disease (PD), little is known about its clinical manifestation, associated mechanisms and treatment. Here we characterized binocular diplopia in non-demented PD patients in an interdisciplinary setting. METHODS: PD patients were prospectively screened for diplopia, visual hallucinations, problems with spatial perception, contrast sensitivity, presence of blurred vision, and history of ophthalmological comorbidities via interview...
September 29, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/28991350/neuroanatomical-structures-in-human-extraocular-muscles-and-their-potential-implication-in-the-development-of-oculomotor-disorders
#8
Ala Paduca, Jan Richard Bruenech
The potential role of sensory feedback from human extraocular muscles has been subjected to considerable speculation in the ophthalmic literature. Extraocular muscles pull against a fairly even load and do not initiate a stretch reflex, even when the eyes are directed toward the boundaries of their respective field of action. These unique working conditions and physiological properties have led to the notion that the sensory signal arising from receptors in extraocular muscles differs from the conventional proprioceptive signal arising from their somatic counterparts...
October 9, 2017: Journal of Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28991332/visual-performance-with-bifocal-and-trifocal-diffractive-intraocular-lenses-a-prospective-three-armed-randomized-multicenter-clinical-trial
#9
Hakan Kaymak, Detlev Breyer, Jorge L Alió, Beatrice Cochener
PURPOSE: To evaluate and compare quality of vision and reading performance outcomes after implantation of bifocal refractive-diffractive, bifocal apodized diffractive, or trifocal diffractive-refractive intraocular lenses (IOLs). METHODS: This randomized, prospective, three-armed multicenter (Spain, Germany, and France) trial included 104 eyes of 52 patients (mean age: 63.2 ± 7.7 years). Patients underwent cataract surgery with bilateral implantation of either AT LISA 809M (Carl Zeiss Meditec, Jena, Germany: AT LISA group, 38 eyes), AT LISA tri 839MP (Carl Zeiss Meditec: AT LISA tri group, 32 eyes), or ReSTOR SN6AD1 (Alcon Laboratories, Inc...
October 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28986596/palisade-endings-of-extraocular-muscles-develop-postnatally-following-different-time-courses
#10
COMPARATIVE STUDY
Roland Blumer, Johannes Streicher, María A Davis-López de Carrizosa, Rosa R de la Cruz, Angel M Pastor
Purpose: To analyze in a frontal-eyed mammal (cat) the postnatal development of palisade endings in extraocular muscles (EOMs) and to compare the spatiotemporal and quantitative patterns of palisade endings among individual rectus muscles. Methods: Cats of different ages ranging from birth to adult stage were studied. EOM whole-mount preparations were fluorescently labeled using six combinations of triple staining and analyzed in the confocal laser scanning microscope...
October 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28976783/prevalence-of-refractive-error-presbyopia-and-unmet-need-of-spectacle-coverage-in-a-northern-district-of-bangladesh-rapid-assessment-of-refractive-error-study
#11
Mohammad Muhit, Hasan Minto, Afroza Parvin, Mohammad Z Jadoon, Johurul Islam, Sumrana Yasmin, Gulam Khandaker
PURPOSE: To determine the prevalence of refractive error (RE), presbyopia, spectacle coverage, and barriers to uptake optical services in Bangladesh. METHOD: Rapid assessment of refractive error (RARE) study following the RARE protocol was conducted in a northern district (i.e., Sirajganj) of Bangladesh (January 2010-December 2012). People aged 15-49 years were selected, and eligible participants had habitual distance and near visual acuity (VA) measured and ocular examinations were performed in those with VA<6/18...
October 4, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28973401/three-dimensional-endoscopic-magnification-for-treatment-of-thoracic-spinal-dural-arteriovenous-fistulas-technical-note
#12
Alexander G Weil, Sami Obaid, Chiraz Chaalala, Daniel Shedid, Elsa Magro, Romuald Seizeur, Michel W Bojanowski
BACKGROUND: Treatment of thoracic spinal dural arteriovenous fistulas (DAVFs) by microsurgery has recently been approached using minimally invasive spine surgery (MISS). The advantages of such an approach are offset by difficult maneuverability within the tubular retractor and by the creation of "tunnel vision" with reduced luminosity to a remote surgical target. OBJECTIVE: To demonstrate how the pitfalls of MISS can be addressed by applying 3-D endoscopy to the minimally invasive approach of spinal DAVFs...
July 25, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28967072/visual-outcomes-after-progressive-apodized-diffractive-intraocular-lens-implantation
#13
Javier García-Bella, Néstor Ventura-Abreu, Laura Morales-Fernández, Paula Talavero-González, Jesús Carballo-Álvarez, Juan Carlos Sanz-Fernández, José M Vázquez-Moliní, José M Martínez-de-la-Casa
PURPOSE: To assess photopic and mesopic vision in patients implanted with the Bi-Flex® M 677 MY bifocal intraocular lens (IOL). METHODS: In this prospective clinical study, 25 patients with cataract in both eyes were subjected to cataract surgery and bilateral implantation of the Bi-Flex® M 677MY (Medicontur, Hungary) IOL. Three months after surgery, high-contrast photopic uncorrected distance visual acuity (UDVA) and corrected distance visual acuity (CDVA) were determined...
September 11, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28945646/efficacy-of-toric-contact-lenses-in-fitting-and-patient-reported-outcomes-in-contact-lens-wearers
#14
Stephanie M Cox, David A Berntsen, Katherine M Bickle, Jessica H Mathew, Daniel R Powell, B Kim Little, Kathrine Osborn Lorenz, Jason J Nichols
OBJECTIVES: To assess whether patient-reported measures are improved with soft toric contact lenses (TCLs) compared with soft spherical contact lenses (SCLs) and whether clinical time needed to fit TCL is greater than SCL. METHODS: Habitual contact lens wearers with vertexed spherical refraction +4.00 to +0.25 D or -0.50 to -9.00 D and cylinder -0.75 to -1.75 DC were randomly assigned to be binocularly fitted into a TCL or SCL, and masked to treatment assignment...
September 21, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28931183/-presbyopia-treatment-solution-by-laser-surgery
#15
Bojan Pajic, Horace Massa, Erika N Eskina
Today there are different options for correcting presbyopia by corneal laser procedure, but all of them have their benefits and compromises. The Monovision is a pseudoaccommodation procedure which works with an anisometropy of up to 2 D. The smaller the anisometropy is the faster a neuroadaptation will be achieved. There could be a decrease of binocularity. The monovision is not well supported by all patients, thus it is important to simulate this correction by contact lenses before surgery. The PresbyLASIK is a corneal multifocal solution for presbyopia correction for emmetropic, myopic and hyperopic eyes...
September 20, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28930248/the-effect-of-acupuncture-on-visual-function-in-patients-with-congenital-and-acquired-nystagmus
#16
Tilo Blechschmidt, Maike Krumsiek, Margarita G Todorova
Background: The aim of this study is to examine the short-term effect of visual function following acupuncture treatment in patients with congenital idiopathic nystagmus and acquired nystagmus (CIN and AN). Methods: An observational pilot study on six patients with confirmed diagnosis of nystagmus (three CIN and three AN patients (2♀, 4♂; mean age 42.67; SD ± 20.57 y)), was performed. Acupuncture treatment was done following a standardized protocol applying needle-acupuncture on the body and the ears. The treatment was scheduled with 10 sessions of 30 min duration over five weeks...
May 23, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28927868/does-videoendoscopy-provide-three-dimensional-vision-in-closed-rhinoplasty
#17
Guncel Ozturk, Bilge Kagan Aysal
Rhinoplasty is a common procedure in cosmetic surgery all over the world. Patients desire enhancement of their facial beauty by the correction of preexisting nasal deformities. Precisely performed operations lead to better results, and enhancing technical accuracy accordingly results in more successful outcomes. Endoscopy helps us visualize the closed parts of the body with the aid of an illuminated optical device. The objective behind the present case series was to bring the advantages of open and closed rhinoplasty together by using endoscopic vision systems...
August 16, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28923587/visual-performance-of-a-quadrifocal-trifocal-intraocular-lens-following-removal-of-the-crystalline-lens
#18
Thomas Kohnen, Michael Herzog, Eva Hemkeppler, Sabrina Schönbrunn, Nina De Lorenzo, Kerstin Petermann, Myriam Böhm
PURPOSE: To evaluate visual performance after implantation of a quadrifocal intraocular lens (IOL). DESIGN: Prospective, non-comparative case series METHODS: Setting: Department of Ophthalmology, Goethe University, Frankfurt, Germany. Patient or Study Population: Twenty-seven patients (54 eyes) received bilateral implantation of the PanOptix IOL (AcrySof® IQ PanOptixTM, Alcon Research, Fort Worth, TX, USA) pre-enrollment. Exclusion criteria were previous ocular surgeries, corneal astigmatism of >1...
September 15, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28922676/combination-therapy-of-intravenous-steroids-and-orbital-irradiation-is-more-effective-than-intravenous-steroids-alone-in-patients-with-graves-orbitopathy
#19
Michael Oeverhaus, Tobias Witteler, Hildegard Lax, Joachim Esser, Dagmar Führer, Anja Eckstein
The aim of this study was to evaluate and compare the efficacy of intravenous (iv) glucocorticoids (GCs) with and without orbital radiotherapy (ORT) in a retrospective analysis of patients with active, moderate-to-severe Graves' orbitopathy (GO). Since diplopia has the strongest impact on quality of life, a careful work up of motility and binocular single vision (BSV) has been performed. The Essen-EUGOGO-Center database (n=3655) was screened for patients with untreated moderate-to-severe, active GO, onset ≤12 months...
October 2017: Hormone and Metabolic Research, Hormon- und Stoffwechselforschung, Hormones et Métabolisme
https://www.readbyqxmd.com/read/28917400/visual-quality-and-performance-comparison-between-2-refractive-rotationally-asymmetric-multifocal-intraocular-lenses
#20
Richard N McNeely, Eric Pazo, Andrew Spence, Olivier Richoz, M Andrew Nesbit, Tara C B Moore, Jonathan E Moore
PURPOSE: To compare the 12-month postoperative quality of vision and visual performance of 2 different refractive rotationally asymmetric multifocal intraocular lenses (IOLs). SETTING: Cathedral Eye Clinic, Belfast, Northern Ireland, United Kingdom. DESIGN: Retrospective case series. METHODS: Refractive lens exchange (RLE) patients were divided into 2 groups. Group A comprised eyes receiving a Lentis Mplus LS-312 MF30 IOL and Group B, eyes receiving a Lenstec SBL-3 IOL...
August 2017: Journal of Cataract and Refractive Surgery
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