10,213 results match your criteria horizontal visual

Lateral Wall Implant as an Adjunct to Lateral Wall Orbital Decompression in Severe Thyroid Eye Disease.

Ophthalmic Plast Reconstr Surg 2021 Jul 21. Epub 2021 Jul 21.

Division of Oculofacial Plastic and Reconstructive Surgery, UC San Diego Viterbi Family Department of Ophthalmology, La Jolla, California Division of Plastic and Reconstructive Surgery, UC San Diego Department of Surgery, La Jolla, California, U.S.A.

Purpose: To describe the use of a lateral wall implant as an adjunct in lateral orbital wall decompression in severe thyroid eye disease.

Methods: This study is a retrospective review of 6 patients who underwent prior orbital decompression but had persistent proptosis. These patients underwent lateral wall decompression with adjunct lateral wall implant placement with a manually vaulted 0. Read More

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The effect of frequency of feedback on overground temporal gait asymmetry post stroke.

Top Stroke Rehabil 2021 Jul 21:1-10. Epub 2021 Jul 21.

Rehabilitation Sciences Institute, University of Toronto, Toronto, Canada.

Background And Objectives: Temporal gait asymmetry (TGA) affects 55% of people with stroke. This study investigated the effects of augmented feedback during overground gait training, on TGA.

Methods: Eighteen people with chronic stroke were randomized to receive one of two feedback displays (A or B) and one of three feedback frequencies; no feedback (0%), after alternate walking trials (50%) or after every trial (100%). Read More

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Analysis of imaging biomarkers and retinal nerve fiber layer thickness in RPGR-associated retinitis pigmentosa.

Graefes Arch Clin Exp Ophthalmol 2021 Jul 21. Epub 2021 Jul 21.

Department of Ophthalmology, University Hospital Bonn, Bonn, Germany.

Purpose: To investigate multimodal retinal imaging characteristics including the retinal nerve fiber layer (RNFL) thickness in patients with RPGR-associated retinitis pigmentosa (RP).

Methods: This cross-sectional case-control study included 17 consecutive patients (median age, 21 years) with RPGR-associated RP who underwent retinal imaging including optical coherence tomography (OCT), short-wavelength fundus autofluorescence (AF) imaging, and RNFL scans centered on the optic disc. RNFL thickness was manually segmented and compared to clinical and imaging parameters including the transfoveal ellipsoid zone (EZ) width, the horizontal diameter of the macular hyperautofluorescent ring. Read More

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The Role of Retinal Connexins Cx36 and Horizontal Cell Coupling in Emmetropization in Guinea Pigs.

Invest Ophthalmol Vis Sci 2021 Jul;62(9):27

School of Optometry and Ophthalmology, and Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China.

Purpose: The purpose of this study was to determine whether retinal gap junctions (GJs) via connexin 36 (Cx36, mediating coupling of many retinal cell types) and horizontal cell (HC-HC) coupling, are involved in emmetropization.

Methods: Guinea pigs (3 weeks old) were monocularly form deprived (FD) or raised without FD (in normal visual [NV] environment) for 2 days or 4 weeks; alternatively, they wore a -4 D lens (hyperopic defocus [HD]) or 0 D lens for 2 days or 1 week. FD and NV eyes received daily subconjunctival injections of a nonspecific GJ-uncoupling agent, 18-β-Glycyrrhetinic Acid (18-β-GA). Read More

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Conserved visual capacity of rats under red light.

Elife 2021 Jul 20;10. Epub 2021 Jul 20.

Cognitive Neuroscience, International School for Advanced Studies, Trieste, Italy.

Recent studies examine the behavioral capacities of rats and mice with and without visual input, and the neuronal mechanisms underlying such capacities. These animals are assumed to be functionally blind under red light, an assumption that might originate in the fact that they are dichromats who possess ultraviolet and green but not red cones. But the inability to see red as a color does not necessarily rule out form vision based on red light absorption. Read More

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Peripheral arterial filling time and peripheral retina fluorescence features in ultra-widefield angiography.

Int J Ophthalmol 2021 18;14(7):1034-1040. Epub 2021 Jul 18.

Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Ophthalmology and Visual Sciences Key Laboratory, Beijing 100730, China.

Aim: To evaluate the peripheral arterial filling time (PAFT) and venous filling time (VFT) in eyes without known diseases that may influence filling process using ultra-widefield (UWF) fluorescein angiography (FA), and to review the peripheral retina fluorescence features.

Methods: A total of 30 eyes of 30 patients were retrospectively reviewed in this observational study. UWF-FA was performed using Optos 200Tx. Read More

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Directional biases in whole hand motion perception revealed by mid-air tactile stimulation.

Cortex 2021 May 1;142:221-236. Epub 2021 May 1.

Cardiff University Brain Research Imaging Centre, School of Psychology, Cardiff University, UK.

Many emerging technologies are attempting to leverage the tactile domain to convey complex spatiotemporal information translated directly from the visual domain, such as shape and motion. Despite the intuitive appeal of touch for communication, we do not know to what extent the hand can substitute for the retina in this way. Here we ask whether the tactile system can be used to perceive complex whole hand motion stimuli, and whether it exhibits the same kind of established perceptual biases as reported in the visual domain. Read More

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The Use of Botulinum Toxin in a Case of Acquired Periodic Alternating Nystagmus.

Br Ir Orthopt J 2021 15;17(1):85-90. Epub 2021 Apr 15.

Moorfields Eye Hospital, GB.

Aim: To describe a case of acquired Periodic Alternating Nystagmus (PAN) with oscillopsia treated with botulinum toxin injections into four horizontal rectus muscles.

Method: A 22-year-old woman presented with sudden onset PAN. The only abnormality found following extensive investigations was bilateral superior cerebellar peduncle atrophy on MRI. Read More

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Factors associated with corneal high-order aberrations before and after femtosecond laser-assisted keratomileusis.

Ann Transl Med 2021 Jun;9(12):989

State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Centre, Sun Yat-sen University, Guangzhou, China.

Background: Corneal high-order aberrations (HOAs) are related to visual quality. However, the factors associated with corneal HOAs before and after femtosecond laser-assisted in situ keratomileusis (FS-LASIK) have not yet been elucidated. The aim of this study is to observe the factors related to corneal HOAs before and after FS-LASIK. Read More

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Athletes Demonstrate Superior Dynamic Visual Acuity.

Optom Vis Sci 2021 Jul 13. Epub 2021 Jul 13.

School of Optometry and Vision Science, University of Waterloo, Waterloo, Ontario, Canada Centre for Eye and Vision Research, 17W Hong Kong Science Park, China University of Waterloo, Liggins Institute, University of Auckland, Auckland, New Zealand

Significance: Athletes exhibit better dynamic visual acuity (DVA) compared with nonathletes, whereas action video game players (VGPs) perform more similarly to controls despite having similar static visual acuity and refractive errors. The differences in DVA between groups were not related to differences in static visual acuity, refractive error, or smooth pursuit gain.

Purpose: The purpose of the study was to examine whether athletes and VGPs have superior DVA than controls (nonathletes, nongamers). Read More

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Which can explain the pip-and-pop effect during a visual search: Multisensory integration or the oddball effect?

J Exp Psychol Hum Percept Perform 2021 May;47(5):689-703

School of Psychology, Liaoning Normal University.

In a dynamic search task, participants were instructed to search for a visual target among various distractors. An auditory stimulus presented in synchrony with a color change of the visual target can improve the efficiency of the search, which is known as the pip-and-pop effect. Some researchers have suggested that the underlying mechanism of this effect is multisensory integration, while others have thought it is due to an oddball stimulation that attracts attention. Read More

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Metamorphopsia and Morphological Changes in the Macula after Scleral Buckling Surgery for Macula-Off Rhegmatogenous Retinal Detachment.

J Ophthalmol 2021 25;2021:5525049. Epub 2021 Jun 25.

Department of Ophthalmology, Eye and ENT Hospital, Fudan University, Shanghai, China.

Purpose: To observe the changes in metamorphopsia after scleral buckling (SB) surgery for macula-off rhegmatogenous retinal detachment (RRD) and its association with morphological changes in the macula.

Methods: This prospective study included 20 eyes of 20 patients. Before surgery and 1, 3, 6, and 12 months after surgery, metamorphopsia measured by -charts and best-corrected visual acuity (BCVA) and macular microstructures assessed using optical coherence tomography were recorded. Read More

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Changes of tuning but not dynamics of contrast adaptation with age.

Vision Res 2021 Jul 9;187:129-136. Epub 2021 Jul 9.

University of Nevada, Reno, United States.

Normal aging results in pronounced optical and neural changes in the visual system. Processes of adaptation are thought to help compensate for many of these changes in order to maintain perceptual constancy, but it is uncertain how stable adaptation itself remains with aging. We compared the dynamics of adaptation in young (aged 19-24 years) and older (aged 66-74) adults. Read More

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Functional organization of spatial frequency tuning in macaque V1 revealed with two-photon calcium imaging.

Prog Neurobiol 2021 Jul 9:102120. Epub 2021 Jul 9.

PKU-Tsinghua Center for Life Sciences, Peking University, Beijing, China; IDG-McGovern Institute for Brain Research, Peking University, Beijing, China; School of Psychology, Peking University, Beijing, China. Electronic address:

V1 neurons are functionally organized in orientation columns in primates. Whether spatial frequency (SF) columns also exist is less clear because mixed results have been reported. A definitive solution would be SF functional maps at single-neuron resolution. Read More

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Electrophysiological priming effects demonstrate independence and overlap of visual regularity representations in the extrastriate cortex.

PLoS One 2021 9;16(7):e0254361. Epub 2021 Jul 9.

Department of Psychological Sciences, University of Liverpool, Liverpool, United Kingdom.

An Event Related Potential (ERP) component called the Sustained Posterior Negativity (SPN) is generated by regular visual patterns (e.g. vertical reflectional symmetry, horizontal reflectional symmetry or rotational symmetry). Read More

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Effect of Wavefront Aberrations on Night Vision Problems and Mesopic Contrast Threshold After SMILE.

J Refract Surg 2021 Jul 1;37(7):446-452. Epub 2021 Jul 1.

Purpose: To investigate the effect of wavefront aberrations on night vision problems and mesopic contrast threshold after small incision lenticule extraction (SMILE).

Methods: Forty-two participants (84 eyes) who underwent SMILE were included in this prospective observational study. Visual outcomes including uncorrected distance visual acuity (UDVA), subjective manifest refraction, mesopic contrast threshold (Binoptometer 4P; Oculus Optikgeräte GmbH), and higher order aberrations (HOAs) were analyzed before and 3 months after surgery. Read More

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Retinotopic organization of visual cortex in human infants.

Neuron 2021 Jun 28. Epub 2021 Jun 28.

Department of Psychology, Yale University, New Haven, CT 06511, USA; Wu Tsai Institute, Yale University, New Haven, CT 06511, USA.

Vision develops rapidly during infancy, yet how visual cortex is organized during this period is unclear. In particular, it is unknown whether functional maps that organize the mature adult visual cortex are present in the infant striate and extrastriate cortex. Here, we test the functional maturity of infant visual cortex by performing retinotopic mapping with functional magnetic resonance imaging (fMRI). Read More

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Series of cases of acute acquired comitant esotropia in children associated with excessive online classes on smartphone during COVID-19 pandemic; digital eye strain among kids (DESK) study-3.

Strabismus 2021 Jul 5:1-5. Epub 2021 Jul 5.

Children Eye Care Center, Department of Pediatric Ophthalmology and Strabismus, Sadguru Netra Chikitsalya and Postgraduate Institute of Ophthalmology, Chitrakoot, MP.

Extra time of sitting in front of a digital device is required for e-learning by children during Corona virus (COVID-19) pandemic which can lead to many ocular problems including digital eye strain (DES). In view of increased incidence of DES in children, multiple studies had been conducted in central India to assess the eye strain in children due to excessive online classes as a research project named "Digital eye strain among kids (DESK) study." This study DESK-3 aimed to report series of cases of acute acquired comitant esotropia (AACE) in children attending online classes during COVID-19 pandemic. Read More

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Age-Related Alterations of Proteins in Albino Wistar Rat Retina.

Cells Tissues Organs 2021 2;210(2):135-150. Epub 2021 Jul 2.

Department of Experimental Zoology and Neurobiology, Institute of Biology, Faculty of Sciences, University of Pécs, Pécs, Hungary.

Imbalance of homeostasis causes permanent changes in the body with time. The central nervous system is especially prone to these changes since it possesses limited regenerative capacity. In the retina, neurons are damaged during the aging process, and this eventually leads to deterioration of vision. Read More

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Eyelid Coupling Using a Modified Tarsoconjunctival Flap in Facial Paralysis.

Facial Plast Surg Clin North Am 2021 Aug;29(3):447-451

Department of Otolaryngology-Head and Neck Surgery, University of California, Davis, 2521 Stockton Boulevard, Suite 7200, Sacramento, CA, USA. Electronic address:

Eyelid coupling using the modified tarsoconjunctival flap is an effective treatment for paralytic ectropion. Eyelid position and quality of life can be improved in patients with flaccid facial paralysis using these eyelid coupling procedures. The modified tarsoconjunctival flap can obscure the lateral visual field by coupling the eyelids, but without distortion of the canthal angle and eyelid margin. Read More

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Anatomical and functional features of photic retinopathy: a spectral domain optical coherence tomography-based longitudinal study.

Graefes Arch Clin Exp Ophthalmol 2021 Jul 3. Epub 2021 Jul 3.

Department of Retina and Vitreous Services, Aravind Eye Hospital, Madurai, India.

Background: Photic retinopathy may lead to permanent foveal structural injury, leading to irreversible visual acuity loss.

Method: This prospective observational study evaluated 51 eyes of 30 patients with photic retinopathy. Optical coherence tomography (OCT) imaging was performed for all the eyes at baseline and final follow-up. Read More

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Tolerance to geometrical inaccuracies in CBCT systems: A comprehensive Study.

Med Phys 2021 Jul 2. Epub 2021 Jul 2.

Dept. Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Spain.

Purpose: The last decades have seen the consolidation of the Cone-Beam CT (CBCT) technology, which is nowadays widely used for different applications such as micro-CT for small animals, mammography, dentistry, or surgical procedures. Some CBCT systems may suffer mechanical strains due to the heavy load of the X-ray tube. This fact, together with tolerances in the manufacturing process, lead to different types of undesirable effects in the reconstructed image unless they are properly accounted for during the reconstruction. Read More

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How Can Biomechanics Improve Physical Preparation and Performance in Paralympic Athletes? A Narrative Review.

Sports (Basel) 2021 Jun 24;9(7). Epub 2021 Jun 24.

Department of Surgery, Faculty of Medicine, University of Montreal, Montreal, QC H3T 1J4, Canada.

Recent research in Paralympic biomechanics has offered opportunities for coaches, athletes, and sports practitioners to optimize training and performance, and recent systematic reviews have served to summarize the state of the evidence connecting biomechanics to Paralympic performance. This narrative review serves to provide a comprehensive and critical evaluation of the evidence related to biomechanics and Paralympic performance published since 2016. The main themes within this review focus on sport-specific body posture: the standing, sitting, and horizontal positions of current summer Paralympic sports. Read More

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Percutaneous endoscopic transforaminal discectomy for the treatment of L5-S1 lumbar disc herniation and the influence of iliac crest height on its clinical effects.

Exp Ther Med 2021 Aug 13;22(2):866. Epub 2021 Jun 13.

Department of Orthopaedics, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China.

The present study aimed to explore the clinical effects of percutaneous endoscopic transforaminal discectomy using a transforaminal endoscopic spine system (TESSYS) technique for the treatment of L5-S1 lumbar disc herniation and to analyse the influence of iliac crest height on these clinical effects. The clinical data of 76 patients with L5-S1 single-segment disc herniation treated with TESSYS at The Second Affiliated Hospital and Third Affiliated Hospital of Xi'an Jiaotong University between January and December 2016 were retrospectively analysed. Patients were divided into the following three groups according to the positional relation between the highest point of the iliac crest and the L4 and L5 pedicles in the lateral lumbar, as determined by X-ray: Group I, iliac crest height below the upper edge horizontal line of the L5 pedicle (n=42); group II, iliac crest height between the lower edge horizontal line of the L4 pedicle and the upper edge horizontal line of the L5 pedicle (n=29) and group III, iliac crest height above the lower edge horizontal line of the L4 pedicle (n=5). Read More

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Anterior Chamber Retained Lens Fragments After Cataract Surgery: A Case Series and Narrative Review.

Clin Ophthalmol 2021 21;15:2625-2633. Epub 2021 Jun 21.

Hoopes Vision Research Center, Hoopes Vision, Draper, UT, USA.

Introduction: Retained lens fragments in the anterior chamber following cataract extraction (CE) with phacoemulsification are rare but can lead to significant patient morbidity. Our study aimed to identify risk factors associated with retained lens fragments.

Methods: Patients who underwent cataract surgery and subsequently identified to have retained lens fragments in the anterior segment were included. Read More

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Botulinum Toxin Injection for the Treatment of Strabismus: A Report by the American Academy of Ophthalmology.

Ophthalmology 2021 Jun 24. Epub 2021 Jun 24.

Jules Stein Eye Institute, Los Angeles, California.

Purpose: To review the available evidence comparing the effectiveness of extraocular muscle botulinum toxin type A (BTXA) injection with eye muscle surgery for restoring ocular alignment in children and adults with nonparalytic, nonrestrictive horizontal strabismus.

Methods: Literature searches in the PubMed Cochrane Library, and clinical trial databases with no date restrictions, but limited to articles published in English, were conducted last on January 10, 2021. The searches yielded 515 citations, 40 of which were reviewed in full text by the first author. Read More

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The rein-type arthroscopic capsular suture for triangular fibrocartilage complex foveal tears: midterm results for 90 patients.

J Hand Surg Eur Vol 2021 Jun 24:17531934211024177. Epub 2021 Jun 24.

Department of Orthopaedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan.

We describe an arthroscopic rein-type capsular suture that approximates the triangular fibrocartilage complex to the anatomical footprint, and report the results at a minimum 12 month follow-up. The procedure involves two 3-0 polydioxanone horizontal mattress sutures inserted 1.5 cm proximal to the 6-R and 6-U portals to obtain purchase on the dorsal and anterior radioulnar ligaments, respectively. Read More

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Kinematic factors associated with start performance in World-class male sprinters.

J Biomech 2021 Jul 7;124:110554. Epub 2021 Jun 7.

Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK.

The aim was to investigate the kinematic factors associated with successful performance in the initial acceleration phase of a sprint in the best male athletes in the World at the 2018 World Indoor Athletics Championships. High speed video (150 Hz) was captured for eight sprinters in the men's 60 m final. Spatio-temporal and joint kinematic variables were calculated from the set position to the end of the first ground contact post-block exit (GC1). Read More

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[Electroretinography in evaluation of neuroprotective effect in an experimental model of glaucoma].

Vestn Oftalmol 2021 ;137(3):86-92

Research Institute of Pharmacology of Living Systems of the Belgorod State University, Belgorod, Russia.

For drugs that have a therapeutic effect on glaucoma through mechanisms not associated with decreasing intraocular pressure (IOP), special attention is paid to the choice of effectiveness criteria. The article examines the possibility of using - and waves of electroretinography (ERG) in preclinical studies to predict the effectiveness of glaucoma drug candidates.

Purpose: To examine the possibility of reliably associating changes in the amplitude of - and ERG waves with functional changes in the retina of experimental glaucoma rats with morphological evidence of loss of functional integrity of the retina. Read More

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Capsular tension ring assisted phacoemulsification of morgagnian cataract.

Indian J Ophthalmol 2021 07;69(7):1781-1785

Department of Ophthalmology, Jawaharlal Institute of Post Graduate Medical Education & Research, Puducherry, India.

Purpose: To describe a novel technique of phacoemulsification in morgagnian cataract using capsular tension ring (CTR).

Methods: This was a retrospective, non-comparative, clinical interventional study. Patients with hypermature morgagnian cataract who had undergone CTR-assisted phacoemulsification were included in the study. Read More

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