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https://www.readbyqxmd.com/read/28327351/parkinson-s-patients-can-rely-on-perspective-cues-to-perceive-3d-space
#1
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
#2
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-faden-technique
#3
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...
March 16, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28317909/the-active-side-of-stereopsis-fixation-strategy-and-adaptation-to-natural-environments
#4
Agostino Gibaldi, Andrea Canessa, Silvio P Sabatini
Depth perception in near viewing strongly relies on the interpretation of binocular retinal disparity to obtain stereopsis. Statistical regularities of retinal disparities have been claimed to greatly impact on the neural mechanisms that underlie binocular vision, both to facilitate perceptual decisions and to reduce computational load. In this paper, we designed a novel and unconventional approach in order to assess the role of fixation strategy in conditioning the statistics of retinal disparity. We integrated accurate realistic three-dimensional models of natural scenes with binocular eye movement recording, to obtain accurate ground-truth statistics of retinal disparity experienced by a subject in near viewing...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28315403/wright-central-plication-of-lateral-rectus-versus-standard-medial-rectus-recession-in-adult-divergence-insufficiency-esotropia
#5
Wright W Kenneth, Giulia Corradetti
PURPOSE: Wright central plication is a minimally invasive tightening procedure described for the first time by Wright and colleagues in 2012. We compare outcomes of lateral rectus central plication (LRCP) to medial rectus recession (MRR) in the treatment of adult divergence insufficiency esotropia (ADIE). METHODS: A retrospective chart review of 30 consecutive patients with ADIE, who underwent either LRCP or MRR between 2010 and 2015 was performed. INCLUSION CRITERIA: age ≥ 45 years, LRCP or MRR surgery fixed suture technique, esotropia (ET) at least 10(Δ) greater at distance than at near, subjective diplopia at distance, fusion at near fixation, follow-up of at least 6 months...
March 14, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28300605/a-rapid-quantification-of-binocular-misalignment-without-recording-eye-movements-vertical-and-torsional-alignment-nulling
#6
Kara H Beaton, Mark J Shelhamer, Dale C Roberts, Michael C Schubert
BACKGROUND: Small, innate asymmetries between the left and right otolith organs can cause ocular misalignment with symptoms that include double vision and motion sickness. Additionally, ocular misalignment affects nearly 5% of the US population. We have developed a portable, non-invasive technology that uses subjective perception of binocular visual signals to estimate relative binocular alignment. NEW METHOD AND RESULTS: The Vertical Alignment Nulling (VAN) and Torsional Alignment Nulling (TAN) tests ask subjects to view one red and one blue line on a tablet computer while looking through color-matched red and blue filters so that each eye sees only one of the lines...
March 11, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28291198/-clinical-results-of-aphakia-correction-with-multifocal-intraocular-lenses
#7
G V Voronin, V R Mamikonyan, V M Sheludchenko, M N Narbut
AIM: to assess visual functions and ergonomics after bilateral versus unilateral implantation of Lentis Comfort LS-313 MF15 multifocal intraocular lenses (MIOL) in aphakic eyes. MATERIAL AND METHODS: A total of 20 patients with М LENTIS LS-313 MF15 MIOLs were followed up. Group 1 consisted of 12 patients after bilateral symmetric implantation, group 2 - of 8 patients after unilateral procedure. The following parameters were examined: uncorrected binocular visual acuity at far, near, and intermediate distances under photopic and mesopic conditions, the range of pseudoaccommodation, spatial contrast sensitivity to achromatic sinusoidal gratings, lens stability with account to its optical design, and patient satisfaction with the resultant vision...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28283212/-identification-of-perforating-vessels-by-augmented-reality-application-for-the-deep-inferior-epigastric-perforator-flap
#8
R Bosc, A Fitoussi, F Pigneur, V Tacher, B Hersant, J-P Meningaud
The augmented reality on smart glasses allows the surgeon to visualize three-dimensional virtual objects during surgery, superimposed in real time to the anatomy of the patient. This makes it possible to preserve the vision of the surgical field and to dispose of added computerized information without the need to use a physical surgical guide or a deported screen. TECHNIQUE: The three-dimensional objects that we used and visualized in augmented reality came from the reconstructions made from the CT-scans of the patients...
March 7, 2017: Annales de Chirurgie Plastique et Esthétique
https://www.readbyqxmd.com/read/28277623/near-visual-impairment-and-spectacle-coverage-in-telangana-india
#9
Srinivas Marmamula, Rohit C Khanna Doms, Eswararao Kunuku, Gullapalli N Rao
IMPORTANCE: The study highlights the burden of Near Visual Impairment (NVI) in India BACKGROUND: NVI is a common condition that can be addressed through provision of spectacles. The study aims to assess the prevalence of NVI and spectacle coverage among those aged ≥40 years south Indian state of Telangana. DESIGN: Population based cross sectional study using a rapid assessment methodology. PARTICIPANTS: 5140 participants enumerated from 123 clusters in two districts and have presenting distance visual acuity of ≥ 6/18 in the better eye...
March 9, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28276792/binocular-vision-and-squint-part-1
#10
Isolde den Tonkelaar, Harold H Henkes, Gijsbert K van Leersum
No abstract text is available yet for this article.
March 2017: Strabismus
https://www.readbyqxmd.com/read/28262490/monocular-perceptual-deprivation-from-interocular-suppression-temporarily-imbalances-ocular-dominance
#11
Hyun-Woong Kim, Chai-Youn Kim, Randolph Blake
Early visual experience sculpts neural mechanisms that regulate the balance of influence exerted by the two eyes on cortical mechanisms underlying binocular vision [1, 2], and experience's impact on this neural balancing act continues into adulthood [3-5]. One recently described, compelling example of adult neural plasticity is the effect of patching one eye for a relatively short period of time: contrary to intuition, monocular visual deprivation actually improves the deprived eye's competitive advantage during a subsequent period of binocular rivalry [6-8], the robust form of visual competition prompted by dissimilar stimulation of the two eyes [9, 10]...
March 20, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28258716/functional-interactions-between-the-macaque-dorsal-and-ventral-visual-pathways-during-three-dimensional-object-vision
#12
REVIEW
Peter Janssen, Bram-Ernst Verhoef, Elsie Premereur
The division of labor between the dorsal and the ventral visual stream in the primate brain has inspired numerous studies on the visual system in humans and in nonhuman primates. However, how and under which circumstances the two visual streams interact is still poorly understood. Here we review evidence from anatomy, modelling, electrophysiology, electrical microstimulation (EM), reversible inactivation and functional imaging in the macaque monkey aimed at clarifying at which levels in the hierarchy of visual areas the two streams interact, and what type of information might be exchanged between the two streams during three-dimensional (3D) object viewing...
February 3, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28257132/the-role-of-rectus-muscle-myectomy-in-the-management-of-large-angle-strabismus-for-graves-ophthalmopathy
#13
S L Liao, Y-H Wei, A Y-C Chuang
PurposeRetrospective noncomparative case series to investigate the role of rectus muscle myectomy for the treatment of large-angle strabismus in patients with Graves' ophthalmopathy.Patients and methodsData from 47 consecutive patients with Graves' ophthalmopathy who underwent complete myectomy for large-angle strabismus (strabismus greater than 25 prism diopters (PDs)) were collected retrospectively. Pre- and postoperative deviations in primary and reading position were measured in PDs. Postoperative deviation of <5 diopters in primary gaze and functional binocular vision in central 30° field were considered as successful surgical outcomes...
March 3, 2017: Eye
https://www.readbyqxmd.com/read/28256489/outcome-of-strabismus-surgery-by-nonadjustable-suture-among-adults-attending-a-university-hospital-of-saudi-arabia
#14
F A Al-Wadaani
OBJECTIVE: To describe the outcome and safety of surgical treatment of Saudi adult patients with strabismus by nonadjustable suture and to evaluate the prevalence of diplopia and binocularity after strabismus correction. MATERIALS AND METHODS: Retrospective analysis of medical records of 96 patients above the age of 16-years old with strabismus seen at the King Fahd Hospital of the King Faisal University (KFUH) from July 1st, 2000 to June 30th, 2007 who were underwent strabismus correction surgery...
March 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28254087/automatic-diagnosis-of-strabismus-in-digital-videos-through-cover-test
#15
Thales Levi Azevedo Valente, João Dallyson Sousa de Almeida, Aristófanes Corrêa Silva, Jorge Antonio Meireles Teixeira, Marcelo Gattass
BACKGROUND AND OBJECTIVE: Medical image processing can contribute to the detection and diagnosis of human body anomalies, and it represents an important tool to assist in minimizing the degree of uncertainty of any diagnosis, while providing specialists with an additional source of diagnostic information. Strabismus is an anomaly that affects approximately 4% of the population. Strabismus modifies vision such that the eyes do not properly align, influencing binocular vision and depth perception...
March 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28253424/botulinum-toxin-for-the-treatment-of-strabismus
#16
REVIEW
Fiona J Rowe, Carmel P Noonan
BACKGROUND: The use of botulinum toxin as an investigative and treatment modality for strabismus is well reported in the medical literature. However, it is unclear how effective it is in comparison to other treatment options for strabismus. OBJECTIVES: The primary objective was to examine the efficacy of botulinum toxin therapy in the treatment of strabismus compared with alternative conservative or surgical treatment options. This review sought to ascertain those types of strabismus that particularly benefit from the use of botulinum toxin as a treatment option (such as small angle strabismus or strabismus with binocular potential, i...
March 2, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28245486/loss-of-binocular-vision-in-monocularly-blind-patients-causes-selective-degeneration-of-the-superior-lateral-occipital-cortices
#17
Doety Prins, Nomdo M Jansonius, Frans W Cornelissen
Purpose: Chronic ocular pathology, such as glaucoma and macular degeneration, is associated with neuroanatomic changes in the visual pathways. It is a challenge to determine the mechanism responsible for these changes. This could be functional deprivation or transsynaptic degeneration. Acquired monocular blindness provides a unique opportunity to establish which mechanism underlies neuroanatomic changes in ocular pathology in general, since the loss of input is well defined, and it causes selective functional deprivation due to the loss of stereopsis...
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28222490/the-prevalence-of-convergence-insufficiency-in-iran-a-population-based-study
#18
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
#19
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
#20
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
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