scholarly journals The Importance of the Interaction Between Ocular Motor Function and Vision During Human Infancy

2019 ◽  
Vol 5 (1) ◽  
pp. 201-221
Author(s):  
T. Rowan Candy
Keyword(s):  
Visual System ◽  
Visual Experience ◽  
Clinical Care ◽  
Three Dimensional ◽  
Typical Development ◽  
Ocular Motor ◽  
Human Infants ◽  
Motor Responses ◽  
The Impact ◽  
Abnormal Visual

Numerous studies have demonstrated the impact of imposed abnormal visual experience on the postnatal development of the visual system. These studies have provided fundamental insights into the mechanisms underlying neuroplasticity and its role in clinical care. However, the ocular motor responses of postnatal human infants largely define their visual experience in dynamic three-dimensional environments. Thus, the immature visual system needs to control its own visual experience. This review explores the interaction between the developing motor and sensory/perceptual visual systems, together with its importance in both typical development and the development of forms of strabismus and amblyopia.

scholarly journals The Impact of Formal Properties on Eye Movement during the Perception of Architecture

1995 ◽  
Author(s):  
Ralf Weber ◽  
◽  
Yun Choi ◽  
Lawrence Stark ◽  
◽  
...  
Keyword(s):  
Visual Experience ◽  
Three Dimensional ◽  
Initial Attempt ◽  
Architectural Form ◽  
Scientific Analysis ◽  
Scan Paths ◽  
Size Contrast ◽  
Spatial Depth ◽  
Formal Properties ◽  
The Impact

The project represented an initial attempt to record how the visual experience of architecture is influenced by various formal-geometric characteristics such as size, contrast, direction, symmetry, closure, etc., and how these factors may alter individual visual scan paths and affect awareness and appreciation of architectural designs. Results indicate that the eye does not trace shapes completely, but focuses on the overall arrangement of visual centers, major masses, and on objects with distinct formal differences from the overall set. Elements indicating spatial depth such as vistas receive special attention. There is a clear preference for the left area of a space. Redundant elements draw less attention than solitary shapes. Vertically and horizontally oriented objects are explored less than obliquely oriented shapes. More work using the methods of this study might provide important findings in the following three areas: scientific analysis of certain characteristic properties of architectural form and space long described by writers on architectural aesthetics; exploration of discrepancies in the perception of two-dimensional and three-dimensional representations of architectural form and space in the design process; and an evaluation of differences in the perception of architectural form and space by architects and non-architects.

scholarly journals Management of Abnormal Visual Developments

2021 ◽  
Author(s):  
Longqian Liu ◽  
Xiaohang Chen ◽  
Pengfan Chen ◽  
Yifan Wu ◽  
Jianglan Wang ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Visual System ◽  
Refractive Error ◽  
Visual Function ◽  
Visual Experience ◽  
External World ◽  
Visual Development ◽  
Human Beings ◽  
Good Visual Acuity ◽  
Abnormal Visual

When human beings recognize the external world, more than 80% of the information come from visual function and visual system. Normal visual development and normal binocularity are the fundamental of good visual acuity and visual functions. Any abnormal visual experience would cause abnormality, such as refractive error, strabismus, amblyopia and other diseases. The patients with abnormal visual developments were reported to have abnormal, lonely, and other psycho problems. In this chapter, we will describe the normal developmental of visual function, summarize the abnormal developments and the correction or treatment.

Analyzing the Impact of X-Ray Tomography on the Reliability of Integrated Circuits

2015 ◽  
Author(s):  
Halit Dogan ◽  
Md Mahbub Alam ◽  
Navid Asadizanjani ◽  
Sina Shahbazmohamadi ◽  
Domenic Forte ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Integrated Circuit ◽  
3D Imaging ◽  
Three Dimensional ◽  
Serial Sectioning ◽  
Promising Technique ◽  
Flash Memories ◽  
X Ray ◽  
3D Information ◽  
The Impact

Abstract X-ray tomography is a promising technique that can provide micron level, internal structure, and three dimensional (3D) information of an integrated circuit (IC) component without the need for serial sectioning or decapsulation. This is especially useful for counterfeit IC detection as demonstrated by recent work. Although the components remain physically intact during tomography, the effect of radiation on the electrical functionality is not yet fully investigated. In this paper we analyze the impact of X-ray tomography on the reliability of ICs with different fabrication technologies. We perform a 3D imaging using an advanced X-ray machine on Intel flash memories, Macronix flash memories, Xilinx Spartan 3 and Spartan 6 FPGAs. Electrical functionalities are then tested in a systematic procedure after each round of tomography to estimate the impact of X-ray on Flash erase time, read margin, and program operation, and the frequencies of ring oscillators in the FPGAs. A major finding is that erase times for flash memories of older technology are significantly degraded when exposed to tomography, eventually resulting in failure. However, the flash and Xilinx FPGAs of newer technologies seem less sensitive to tomography, as only minor degradations are observed. Further, we did not identify permanent failures for any chips in the time needed to perform tomography for counterfeit detection (approximately 2 hours).

Neurological Impact of Wallenberg Syndrome on the Visual-Vestibular Systems

2020 ◽  
pp. 8-14
Keyword(s):  
Case Report ◽  
Left Vertebral Artery ◽  
Clinical Correlation ◽  
Ocular Motor ◽  
Eye Care ◽  
Motor Responses ◽  
Wallenberg Syndrome ◽  
Video Recordings ◽  
Binocular Diplopia ◽  
Skew Deviation

Purpose: This case discusses the neurological impact of Wallenberg syndrome on the visual-vestibular system and provides a clinical pathologic correlation between neuro-anatomic involvements with the manifesting symptoms. Case Report: A 50-year-old male presented for consultation following a left lateral medullary infarct occlusion of the left vertebral artery (Wallenberg syndrome) with complaints of intermittent binocular diplopia, vertigo, and oscillopsia. Assessment revealed an intermittent central nystagmus, a right skew deviation, and a left Horner’s syndrome. Video recordings of the nystagmus and ocular motor responses were documented. Conclusion: Wallenberg syndrome has very defined characteristics which can be used clinically to make a definitive diagnosis.It is important for eye care professionals to understand the neuro-anatomic involvements associated with this condition and make the clinical correlation to aid in the treatment and management of these patients.

Exogenous Neonatal Erythropoietin Mitigates Brain Damage After a Combination of Prenatal Hypoxic-Ischemia and Lipopolysaccharide Inflammation in Rats

2008 ◽  
Vol 1 (4) ◽  
pp. A353
Author(s):  
Shenandoah Robinson ◽  
Qing Li
Keyword(s):  
Brain Damage ◽  
Intracellular Signaling ◽  
System Development ◽  
Intrauterine Infection ◽  
Artery Occlusion ◽  
Nervous System Development ◽  
Human Infants ◽  
Hypoxic Ischemia ◽  
Show Evidence ◽  
The Impact

Introduction Many infants born very preterm who suffer brain damage most likely experienced a combined insult from intrauterine infection and placental insufficiency. Damage is thought to be synergistic rather than additive but the mechanisms of combined injury remain elusive. A combination of lipopolysaccharide-induced inflammation and hypoxia-ischemia has been used in rats to model the dual insult that occurs in human infants prenatally. Erythropoietin, a pleiotrophic cytokine that is essential for central nervous system development, ameliorates brain injury after isolated hypoxic-ischemic or inflammatory insults through different intracellular signaling pathways. We hypothesized that exogenous neonatal EPO administration would lessen the damage of a combined prenatal insult in rats. Methods On embryonic Day 18 fetal rats experienced 60 minutes of transient uterine artery occlusion with or without intracervical LPS administration with sham controls receiving surgery but no occlusion and saline for LPS. Survival was recorded and histological biochemical and functional assays were performed. Means were compared with ANOVA with Tukey HSD post hoc analysis. Results After a combined insult of HI and 0.15-mg/kg LPS on E18 the survival of pups by postnatal Day 1 (P1) decreased from 77% with HI alone to 22% for LPS plus HI. When exogenous systemic EPO was administered P1–P3 survival to P9 improved markedly from 40% (2 of 5) for saline-treated insult pups to 100% (6 of 6) for EPO-treated. Initial histological analyses show EPO decreases the number of brain activated caspase 3 and activated microglia by P9. Additional analyses will be presented. Conclusion As at least 60% of placentas from infants born pre-term show evidence of chorioamnionitis, assessment of the impact of exogenous EPO on a model of a combination injury is essential prior to proceeding with a clinical trial. Initial results indicate neonatal exogenous EPO mitigates damage from the combined insult.

scholarly journals Disease monitoring of biologic treatment in IBD: early impact and future implications of COVID-19 pandemic

2020 ◽  
pp. flgastro-2020-101563
Author(s):  
Stephanie Shields ◽  
Allan Dunlop ◽  
John Paul Seenan ◽  
Jonathan Macdonald
Keyword(s):  
Clinical Care ◽  
Chronic Illnesses ◽  
Therapeutic Drug ◽  
Disease Monitoring ◽  
Biologic Treatment ◽  
Faecal Calprotectin ◽  
Routine Clinical Care ◽  
Risk Of Disease ◽  
Inflammatory Bowel ◽  
The Impact

COVID-19 has dominated life in 2020 with, at the time of writing, over 4.9M global cases and >320 000 deaths. The impact has been most intensely felt in acute and critical care environments. However, with most UK elective work postponed, laboratory testing of faecal calprotectin halted due to potential risk of viral transmission and non-emergency endoscopies and surgeries cancelled, the secondary impact on chronic illnesses such as inflammatory bowel disease (IBD) is becoming apparent. Data from the Scottish Biologic Therapeutic Drug Monitoring (TDM) service shows a dramatic drop in TDM testing since the pandemic onset. April 2020 saw a 75.6% reduction in adalimumab testing and a 36.2% reduction in infliximab testing when compared with February 2020 data, a reduction coinciding with the widespread cancellation of outpatient and elective activity. It is feared that disruption to normal patterns of care and disease monitoring of biologic patients could increase the risk of disease flare and adverse clinical outcomes. Urgent changes in clinical practice have been instigated to mitigate the effects of the pandemic on routine clinical care. Further transformations are needed to maintain safe, effective, patient-centred IBD care in the future.

scholarly journals Droperidol dropped; consultants not consulted

2003 ◽  
Vol 27 (08) ◽  
pp. 301-304
Author(s):  
Gavin Reid ◽  
Mark Hughson
Keyword(s):  
Questionnaire Survey ◽  
Clinical Care ◽  
Postal Questionnaire ◽  
Clinical Implications ◽  
The West ◽  
Abrupt Withdrawal ◽  
Before And After ◽  
Adequate Evaluation ◽  
Psychiatric Profession ◽  
The Impact

Aims and Method We conducted a postal questionnaire survey of the practice of rapid tranquillisation among 215 consultant psychiatrists in the West of Scotland, before and after the withdrawal of droperidol by the manufacturer. Results One hundred and eighty questionnaires (84% of those sent) were returned. Droperidol had been used extensively, often combined with lorazepam, for rapid tranquillisation. The main replacement suggested for droperidol was haloperidol. About half of the respondents to our survey chose to comment on the withdrawal of droperidol. More than half of the comments were unfavourable, including lack of an adequate replacement and lack of consultation with the psychiatric profession. Clinical Implications The abrupt withdrawal of droperidol, partly for commercial reasons, was regrettable. There was no time for an adequate evaluation of possible replacement medications and a lack of consultation with the profession regarding the impact on clinical care.

scholarly journals Numerical simulation of the impact of an integrated renovation project on the Maowei Sea hydrodynamic environment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cui Wang ◽  
Ling Cai ◽  
Yaojian Wu ◽  
Yurong Ouyang
Keyword(s):  
Water Exchange ◽  
Land Reclamation ◽  
Three Dimensional ◽  
Exchange Capacity ◽  
Reclamation Project ◽  
Hydrodynamic Environment ◽  
Sea Area ◽  
Water Quality Models ◽  
The Impact ◽  
Main Factor

AbstractIntegrated renovation projects are important for marine ecological environment protection. Three-dimensional hydrodynamics and water quality models are developed for the Maowei Sea to assess the hydrodynamic environment base on the MIKE3 software with high resolution meshes. The results showed that the flow velocity changed minimally after the project, decreasing by approximately 0.12 m/s in the east of the Maowei Sea area and increasing by approximately 0.01 m/s in the northeast of the Shajing Port. The decrease in tidal prism (~ 2.66 × 106 m3) was attributed to land reclamation, and accounted for just 0.86% of the pre-project level. The water exchange half-life increased by approximately 1 day, implying a slightly reduced water exchange capacity. Siltation occurred mainly in the reclamation and dredging areas, amounting to back-silting of approximately 2 cm/year. Reclamation project is the main factor causing the decrease of tidal volume and weakening the hydrodynamics in Maowei Sea. Adaptive management is necessary for such a comprehensive regulation project. According to the result, we suggest that reclamation works should strictly prohibit and dredging schemes should optimize in the subsequent regulation works.

scholarly journals Mechanical Behavior of Hydroxyapatite-Chitosan Composite: Effect of Processing Parameters

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 213
Author(s):  
Hamid Ait Said ◽  
Hassan Noukrati ◽  
Hicham Ben Youcef ◽  
Ayoub Bayoussef ◽  
Hassane Oudadesse ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Compressive Strength ◽  
Mechanical Strength ◽  
Bone Repair ◽  
Mechanical Stability ◽  
Three Dimensional ◽  
Processing Parameters ◽  
Composite Effect ◽  
Solid Liquid ◽  
The Impact

Three-dimensional hydroxyapatite-chitosan (HA-CS) composites were formulated via solid-liquid technic and freeze-drying. The prepared composites had an apatitic nature, which was demonstrated by X-ray diffraction and Infrared spectroscopy analyses. The impact of the solid/liquid (S/L) ratio and the content and the molecular weight of the polymer on the composite mechanical strength was investigated. An increase in the S/L ratio from 0.5 to 1 resulted in an increase in the compressive strength for HA-CSL (CS low molecular weight: CSL) from 0.08 ± 0.02 to 1.95 ± 0.39 MPa and from 0.3 ± 0.06 to 2.40 ± 0.51 MPa for the HA-CSM (CS medium molecular weight: CSM). Moreover, the increase in the amount (1 to 5 wt%) and the molecular weight of the polymer increased the mechanical strength of the composite. The highest compressive strength value (up to 2.40 ± 0.51 MPa) was obtained for HA-CSM (5 wt% of CS) formulated at an S/L of 1. The dissolution tests of the HA-CS composites confirmed their cohesion and mechanical stability in an aqueous solution. Both polymer and apatite are assumed to work together, giving the synergism needed to make effective cylindrical composites, and could serve as a promising candidate for bone repair in the orthopedic field.

Can prism adaptation effects generalize to wheelchair maneuvering?

2021 ◽  
pp. 1-10
Author(s):  
Lindsay E. Wyatt ◽  
Anne Sophie Champod ◽  
Gabrielle M. Haidar ◽  
Gail A. Eskes
Keyword(s):  
Standard Treatment ◽  
Clinical Care ◽  
Prism Adaptation ◽  
Spatial Neglect ◽  
Hand Position ◽  
Everyday Activity ◽  
After Effects ◽  
Everyday Activities ◽  
Promising Tool ◽  
The Impact

BACKGROUND: While prism adaptation (PA) has been recognized as a promising tool for treating spatial neglect, implementation as a standard treatment in clinical care has been lagging. Limited evidence for the generalization of after-effects to everyday activities has been a barrier towards implementation. OBJECTIVES: This study examined whether a home-friendly standardized PA protocol (Peg-the-Mole, PTM) induces after-effects that can transfer to wheelchair maneuvering. We also examined the impact of using constant (1 starting hand position) or variable (3 starting hand positions) training conditions on the transfer of after-effects to wheelchair maneuvering. METHODS: Sixty participants were randomly assigned to one of four PTM conditions: 1) prisms/constant training; 2) prisms/variable training; 3) sham goggles/constant training; 4) sham goggles/variable training. RESULTS: The use of PTM with rightward shifting prisms induced after-effects on proprioceptive and visual pointing outcome tasks. Groups using PTM with prism goggles showed a leftward shift in their position within a wheelchair course and a reduction in the number of right-sided collisions. The training condition did not have an impact on the transfer of after-effects to wheelchair driving. CONCLUSION: PTM is a clinically appealing PA protocol that induces after-effects that can transfer to an everyday activity relevant to patients with neglect.

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