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https://www.readbyqxmd.com/read/28980154/vep-based-acuity-assessment-in-low-vision
#1
Michael B Hoffmann, Jan Brands, Wolfgang Behrens-Baumann, Michael Bach
PURPOSE: Objective assessment of visual acuity (VA) is possible with VEP methodology, but established with sufficient precision only for vision better than about 1.0 logMAR. We here explore whether this can be extended down to 2.0 logMAR, highly desirable for low-vision evaluations. METHODS: Based on the stepwise sweep algorithm (Bach et al. in Br J Ophthalmol 92:396-403, 2008) VEPs to monocular steady-state brief onset pattern stimulation (7.5-Hz checkerboards, 40% contrast, 40 ms on, 93 ms off) were recorded for eight different check sizes, from 0...
October 4, 2017: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/28973096/automated-grading-of-age-related-macular-degeneration-from-color-fundus-images-using-deep-convolutional-neural-networks
#2
Philippe M Burlina, Neil Joshi, Michael Pekala, Katia D Pacheco, David E Freund, Neil M Bressler
Importance: Age-related macular degeneration (AMD) affects millions of people throughout the world. The intermediate stage may go undetected, as it typically is asymptomatic. However, the preferred practice patterns for AMD recommend identifying individuals with this stage of the disease to educate how to monitor for the early detection of the choroidal neovascular stage before substantial vision loss has occurred and to consider dietary supplements that might reduce the risk of the disease progressing from the intermediate to the advanced stage...
September 28, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28956858/circadian-rhythms-of-retinomotor-movement-in-a-marine-megapredator-the-atlantic-tarpon-megalops-atlanticus
#3
Kristin L Kopperud, Michael S Grace
Many ecologically and economically important marine fish species worldwide spend portions of their lives in coastal regions that are increasingly inundated by artificial light at night. However, while extensive research illustrates the harmful effects of inappropriate light exposure on biological timing in humans, rodents and birds, comparable studies on marine fish are virtually nonexistent. This study aimed to assess the effects of light on biological clock function in the marine fish retina using the Atlantic tarpon (Megalops atlanticus) as a model...
September 28, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28945652/comparison-between-viscous-teardrops-and-saline-solution-to-fill-orthokeratology-contact-lenses-before-overnight-wear
#4
Gonzalo Carracedo, Cesar Villa-Collar, Alba Martin-Gil, Maria Serramito, Leticia Santamaría
OBJECTIVE: To compare, in terms of efficacy, the differences between the use of saline solution and a viscous artificial tear to fill the lens during the first month of orthokeratology wear. METHODS: A pilot, double-masked, crossed, randomized, and prospective study was conducted. In this study, 20 subjects (14 males and 6 females) with a mean age of 16.29±6.22 years (range, 10-26) were fitted with orthokeratology contact lenses. For the study, nonpreserved 0.9% NaCl commercial saline solution (Avizor, Madrid, Spain) and nonpreserved artificial teardrops with 0...
September 21, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28937644/american-sign-language-alphabet-recognition-using-a-neuromorphic-sensor-and-an-artificial-neural-network
#5
Miguel Rivera-Acosta, Susana Ortega-Cisneros, Jorge Rivera, Federico Sandoval-Ibarra
This paper reports the design and analysis of an American Sign Language (ASL) alphabet translation system implemented in hardware using a Field-Programmable Gate Array. The system process consists of three stages, the first being the communication with the neuromorphic camera (also called Dynamic Vision Sensor, DVS) sensor using the Universal Serial Bus protocol. The feature extraction of the events generated by the DVS is the second part of the process, consisting of a presentation of the digital image processing algorithms developed in software, which aim to reduce redundant information and prepare the data for the third stage...
September 22, 2017: Sensors
https://www.readbyqxmd.com/read/28936963/-application-of-self-made-guidance-for-difficult-gastric-tube-placement-in-patients-with-artificial-airway
#6
Xiaojie Chen, Jinchao Zhang, Wenxiu Li, Yiqing Jiang, Lingzhi Lin
OBJECTIVE: To use evidence-based nursing on patients with artificial airway to the practice of stomach tube, and to evaluate the self made guidance for difficult gastric tube placement in patients with artificial airway. METHODS: Forty patients with artificial airway and were difficult to put the tube, and admitted to Department of Critical Care Medicine of Harrison International Peace Hospital Affiliated to Hebei Medical University from April to December in 2016 were enrolled as observation group...
September 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28925742/visual-search-performance-in-patients-with-vision-impairment-a-systematic-review
#7
Cassia Senger, Maria Rita Rodrigues Alves Margarido, Carlos Gustavo De Moraes, Ligia Issa De Fendi, André Messias, Jayter Silva Paula
PURPOSE: Patients with visual impairment are constantly facing challenges to achieve an independent and productive life, which depends upon both a good visual discrimination and search capacities. Given that visual search is a critical skill for several daily tasks and could be used as an index of the overall visual function, we investigated the relationship between vision impairment and visual search performance. METHODS: A comprehensive search was undertaken using electronic PubMed, EMBASE, LILACS, and Cochrane databases from January 1980 to December 2016, applying the following terms: "visual search", "visual search performance", "visual impairment", "visual exploration", "visual field", "hemianopia", "search time", "vision lost", "visual loss", and "low vision"...
September 19, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28922130/haze-removal-using-radial-basis-function-networks-for-visibility-restoration-applications
#8
Bo-Hao Chen, Shih-Chia Huang, Chian-Ying Li, Sy-Yen Kuo
Restoration of visibility in hazy images is the first relevant step of information analysis in many outdoor computer vision applications. To this aim, the restored image must feature clear visibility with sufficient brightness and visible edges, while avoiding the production of noticeable artifacts. In this paper, we propose a haze removal approach based on the radial basis function (RBF) through artificial neural networks dedicated to effectively removing haze formation while retaining not only the visible edges but also the brightness of restored images...
September 15, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28881099/renal-protective-and-ameliorating-impacts-of-omega-3-fatty-acids-against-aspartame-damaged-mdck-cells
#9
Muthuraman Pandurangan, Gansukh Enkhtaivan, Muthuviveganandavel Veerappan, Bhupendra Mistry, Rahul Patel, So Hyun Moon, Patnamsetty Chidanandha Nagajyothi, Doo Hwan Kim
Aspartame is widely used artificial sweeteners as food additives. Several researchers have pointed that the controversial report on the use of aspartame over more than decades. Omega-3 fatty acids are essential and unsaturated fatty acids, and it plays a remarkable role in vision, intelligence, neural development, and metabolism of neurotransmitters. Therefore, the present study was aimed to investigate the effect of omega-3 fatty acids on aspartame treated renal cells. Experimental groups were divided into three such as sham control, aspartame treated, and aspartame with omega-3 fatty acids...
September 7, 2017: BioFactors
https://www.readbyqxmd.com/read/28872869/demystifying-multitask-deep-neural-networks-for-quantitative-structure-activity-relationships
#10
Yuting Xu, Junshui Ma, Andy Liaw, Robert P Sheridan, Vladimir Svetnik
Deep neural networks (DNNs) are complex computational models that have found great success in many artificial intelligence applications, such as computer vision1,2 and natural language processing.3,4 In the past four years, DNNs have also generated promising results for quantitative structure-activity relationship (QSAR) tasks.5,6 Previous work showed that DNNs can routinely make better predictions than traditional methods, such as random forests, on a diverse collection of QSAR data sets. It was also found that multitask DNN models-those trained on and predicting multiple QSAR properties simultaneously-outperform DNNs trained separately on the individual data sets in many, but not all, tasks...
October 2, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28861006/cephalopods-as-predators-a-short-journey-among-behavioral-flexibilities-adaptions-and-feeding-habits
#11
REVIEW
Roger Villanueva, Valentina Perricone, Graziano Fiorito
The diversity of cephalopod species and the differences in morphology and the habitats in which they live, illustrates the ability of this class of molluscs to adapt to all marine environments, demonstrating a wide spectrum of patterns to search, detect, select, capture, handle, and kill prey. Photo-, mechano-, and chemoreceptors provide tools for the acquisition of information about their potential preys. The use of vision to detect prey and high attack speed seem to be a predominant pattern in cephalopod species distributed in the photic zone, whereas in the deep-sea, the development of mechanoreceptor structures and the presence of long and filamentous arms are more abundant...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28803481/autonomous-collision-free-navigation-of-microvehicles-in-complex-and-dynamically-changing-environments
#12
Tianlong Li, Xiaocong Chang, Zhiguang Wu, Jinxing Li, Guangbin Shao, Xinghong Deng, Jianbin Qiu, Bin Guo, Guangyu Zhang, Qiang He, Longqiu Li, Joseph Wang
Self-propelled micro- and nanoscale robots represent a rapidly emerging and fascinating robotics research area. However, designing autonomous and adaptive control systems for operating micro/nanorobotics in complex and dynamically changing environments, which is a highly demanding feature, is still an unmet challenge. Here we describe a smart microvehicle for precise autonomous navigation in complicated environments and traffic scenarios. The fully autonomous navigation system of the smart microvehicle is composed of a microscope-coupled CCD camera, an artificial intelligence planner, and a magnetic field generator...
September 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28802684/-management-of-post-traumatic-aphakia-and-aniridia-retrospective-study-of-17-patients-undergoing-scleral-sutured-artificial-iris-intraocular-lens-implantation-management-of-aphakia-aniridia-with-scleral-sutured-artificial-iris-intraocular-lenses
#13
A-S Villemont, V Kocaba, H Janin-Manificat, L Abouaf, M Poli, A-S Marty, M Rabilloud, J Fleury, C Burillon
PURPOSE: To evaluate the long-term outcomes of artificial iris intraocular lenses sutured to the sclera for managing traumatic aphakia and aniridia. METHODS: All consecutive cases receiving a Morcher(®) combination implant from June 2008 to February 2016 in Edouard-Herriot Hospital (Lyon, France) were included in this single-center retrospective study. Visual acuity, subjective degree of glare, quality of life and surgical complications were evaluated. RESULTS: Seventeen eyes of 17 patients were included, among which 82% were male...
September 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28782627/electrical-stimulation-of-different-retinal-components-and-the-effect-of-asymmetric-pulses
#14
Dorit Raz-Prag, Giora Beit-Yaakov, Yael Hanein
BACKGROUND: High resolution electrical stimulation of neural tissue is a fundamental challenge in applications such as deep brain stimulation and artificial vision. In artificial vision, achieving and validating local selective epi-retinal stimulation of different layers in the retina is particularly challenging owing to plurality of retinal cell types and delocalized wiring. RESULTS: Strong selectivity and non-localized responses to epi-retinal stimulation, over a wide range of realistic stimulation parameters, was achieved and validated using asymmetric pulses...
November 1, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28777356/health-effects-of-carotenoids-during-pregnancy-and-lactation
#15
REVIEW
Monika A Zielińska, Aleksandra Wesołowska, Beata Pawlus, Jadwiga Hamułka
Adequate nutrition is particularly important during pregnancy since it is needed not only for maintaining the health of the mother, but also determines the course of pregnancy and its outcome, fetus development as well as the child's health after birth and during the later period of life. Data coming from epidemiological and interventions studies support the observation that carotenoids intake provide positive health effects in adults and the elderly population. These health effects are the result of their antioxidant and anti-inflammatory properties...
August 4, 2017: Nutrients
https://www.readbyqxmd.com/read/28758207/the-potential-of-computer-vision-optical-backscattering-parameters-and-artificial-neural-network-modelling-in-monitoring-the-shrinkage-of-sweet-potato-ipomoea-batatas-l-during-drying
#16
Daniel I Onwude, Norhashila Hashim, Khalina Abdan, Rimfiel Janius, Guangnan Chen
BACKGROUND: Drying is a method used to preserve agricultural crops. During the drying of products with high moisture content, structural changes in shape, volume, area, density and porosity occur. This changes could affect the final quality of dried product and also the effective design of drying equipment. Therefore, this study investigated a novel approach in monitoring and predicting the shrinkage of sweet potato during drying. Drying experiments were conducted at temperatures of 50-70 °C and samples thicknesses of 2 - 6 mm...
July 30, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28746814/probabilistic-computations-for-attention-eye-movements-and-search
#17
Miguel P Eckstein
The term visual attention immediately evokes the idea of limited resources, serial processing, or a zoom metaphor. But evidence has slowly accumulated that computations that take into account probabilistic relationships among visual forms and the target contribute to optimizing decisions in biological and artificial organisms, even without considering these limited-capacity processes in covert attention or even foveation. The benefits from such computations can be formalized within the framework of an ideal Bayesian observer and can be related to the classic theory of sensory cue combination in vision science and context-driven approaches to object detection in computer vision...
September 15, 2017: Annual Review of Vision Science
https://www.readbyqxmd.com/read/28743725/altered-balance-of-receptive-field-excitation-and-suppression-in-visual-cortex-of-amblyopic-macaque-monkeys
#18
Luke E Hallum, Christopher Shooner, Romesh D Kumbhani, Jenna G Kelly, Virginia García-Marín, Najib J Majaj, J Anthony Movshon, Lynne Kiorpes
In amblyopia, a visual disorder caused by abnormal visual experience during development, the amblyopic eye (AE) loses visual sensitivity whereas the fellow eye (FE) is largely unaffected. Binocular vision in amblyopes is often disrupted by interocular suppression. We used 96-electrode arrays to record neurons and neuronal groups in areas V1 and V2 of six female macaque monkeys (Macaca nemestrina) made amblyopic by artificial strabismus or anisometropia in early life, as well as two visually normal female controls...
August 23, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28732233/piecewise-convexity-of-artificial-neural-networks
#19
Blaine Rister, Daniel L Rubin
Although artificial neural networks have shown great promise in applications including computer vision and speech recognition, there remains considerable practical and theoretical difficulty in optimizing their parameters. The seemingly unreasonable success of gradient descent methods in minimizing these non-convex functions remains poorly understood. In this work we offer some theoretical guarantees for networks with piecewise affine activation functions, which have in recent years become the norm. We prove three main results...
July 3, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28704206/an-autonomous-robot-inspired-by-insect-neurophysiology-pursues-moving-features-in-natural-environments
#20
Zahra M Bagheri, Benjamin S Cazzolato, Steven Grainger, David C O'Carroll, Steven D Wiederman
OBJECTIVE: Many computer vision and robotic applications require the implementation of robust and efficient target-tracking algorithms on a moving platform. However, deployment of a real-time system is challenging, even with the computational power of modern hardware. Lightweight and low-powered flying insects, such as dragonflies, track prey or conspecifics within cluttered natural environments, illustrating an efficient biological solution to the target-tracking problem. APPROACH: We used our recent recordings from 'small target motion detector' neurons in the dragonfly brain to inspire the development of a closed-loop target detection and tracking algorithm...
July 13, 2017: Journal of Neural Engineering
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