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https://www.readbyqxmd.com/read/28222007/object-discovery-via-cohesion-measurement
#1
Guanjun Guo, Hanzi Wang, Wan-Lei Zhao, Yan Yan, Xuelong Li
Color and intensity are two important components in an image. Usually, groups of image pixels, which are similar in color or intensity, are an informative representation for an object. They are therefore particularly suitable for computer vision tasks, such as saliency detection and object proposal generation. However, image pixels, which share a similar real-world color, may be quite different since colors are often distorted by intensity. In this paper, we reinvestigate the affinity matrices originally used in image segmentation methods based on spectral clustering...
February 16, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28208185/evaluation-of-progressive-visual-dysfunction-and-retinal-degeneration-in-patients-with-parkinson-s-disease
#2
Maria Satue, Maria J Rodrigo, Javier Obis, Elisa Vilades, Hector Gracia, Sofia Otin, Maria I Fuertes, Raquel Alarcia, Jose A Crespo, Vicente Polo, Jose M Larrosa, Luis E Pablo, Elena Garcia-Martin
Purpose: To quantify changes in visual function parameters and in the retinal nerve fiber layer and macular thickness over a 5-year period in patients with Parkinson's disease (PD). Methods: Thirty patients with PD and 30 healthy subjects underwent a complete ophthalmic evaluation, including assessment of visual acuity, contrast sensitivity vision, color vision, and retinal evaluation with spectral-domain optical coherence tomography (SD-OCT). All subjects were reevaluated after 5 years to quantify changes in visual function parameters, the retinal nerve fiber layer, and macular thickness...
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28201776/how-turtles-and-crocodiles-lost-the-parietal-third-eye-and-their-differing-color-vision-adaptations
#3
Joseph Caspermeyer
No abstract text is available yet for this article.
February 2, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28199005/specialized-photoreceptor-composition-in-the-raptor-fovea
#4
Mindaugas Mitkus, Peter Olsson, Matthew B Toomey, Joseph C Corbo, Almut Kelber
The retinae of many bird species contain a depression with high photoreceptor density known as the fovea. Many species of raptors have two foveae, a deep central fovea and a shallower temporal fovea. Birds have six types of photoreceptors: rods, active in dim light, double cones that are thought to mediate achromatic discrimination, and four types of single cones mediating color vision. To maximize visual acuity, the fovea should only contain photoreceptors contributing to high-resolution vision. Interestingly, it has been suggested that raptors might lack double cones in the fovea...
February 15, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28197754/differences-in-ocular-findings-in-two-siblings-one-with-complete-and-other-with-incomplete-achromatopsia
#5
Shinji Ueno, Ayami Nakanishi, Akira Sayo, Taro Kominami, Yasuki Ito, Takaaki Hayashi, Kazushige Tsunoda, Takeshi Iwata, Hiroko Terasaki
PURPOSE: Patients with complete achromatopsia (ACHM) lack cone function, and patients with incomplete ACHM have relatively good visual acuity with residual color vision. The pathological mechanism(s) underlying incomplete ACHM has not been determined. The purpose of this study was to determine the pathophysiology of ACHM in two siblings: one with complete ACHM and the other with incomplete ACHM. METHODS: The medical charts of the two siblings were reviewed. RESULTS: The sibling with incomplete ACHM had decimal visual acuities that ranged from 0...
February 14, 2017: Documenta Ophthalmologica. Advances in Ophthalmology
https://www.readbyqxmd.com/read/28195004/physiological-modeling-for-detecting-degree-of-perception-of-a-color-deficient-person
#6
T Rajalakshmi, Shanthi Prince
Physiological modeling of retina plays a vital role in the development of high-performance image processing methods to produce better visual perception. People with normal vision have an ability to discern different colors. The situation is different in the case of people with color blindness. The aim of this work is to develop a human visual system model for detecting the level of perception of people with red, green and blue deficiency by considering properties like luminance, spatial and temporal frequencies...
February 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28193809/living-in-the-dark-does-not-mean-a-blind-life-bird-and-mammal-visual-communication-in-dim-light
#7
REVIEW
Vincenzo Penteriani, María Del Mar Delgado
For many years, it was believed that bird and mammal communication 'in the dark of the night' relied exclusively on vocal and chemical signalling. However, in recent decades, several case studies have conveyed the idea that the nocturnal world is rich in visual information. Clearly, a visual signal needs a source of light to work, but diurnal light (twilight included, i.e. any light directly dependent on the sun) is not the only source of luminosity on this planet. Actually, moonlight represents a powerful source of illumination that cannot be neglected from the perspective of visual communication...
April 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28193687/rainbow-enhancers-regulate-restrictive-transcription-in-teleost-green-red-and-blue-cones
#8
Wei Fang, Chuanyu Guo, Xiangyun Wei
Photoreceptor-specific transcription of individual genes collectively constitutes the transcriptional profile that orchestrates the structural and functional characteristics of each photoreceptor type. It is challenging, however, to study the transcriptional specificity of individual photoreceptor genes because each gene's distinct spatiotemporal transcription patterns are determined by the unique interactions between a specific set of transcription factors and the gene's own cis-regulatory elements (CREs), which remain unknown for most of the genes...
February 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28187977/retinal-and-optic-nerve-degeneration-in-patients-with-multiple-sclerosis-followed-up-for-5-years
#9
Elena Garcia-Martin, Jose R Ara, Jesus Martin, Carmen Almarcegui, Isabel Dolz, Elisa Vilades, Laura Gil-Arribas, Francisco J Fernandez, Vicente Polo, Jose M Larrosa, Luis E Pablo, Maria Satue
PURPOSE: To quantify retinal nerve fiber layer (RNFL) changes in patients with multiple sclerosis (MS) and healthy controls with a 5-year follow-up and to analyze correlations between disability progression and RNFL degeneration. DESIGN: Observational and longitudinal study. PARTICIPANTS: One hundred patients with relapsing-remitting MS and 50 healthy controls. METHODS: All participants underwent a complete ophthalmic and electrophysiologic exploration and were re-evaluated annually for 5 years...
February 7, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28180039/endoscopic-endonasal-optic-nerve-decompression-for-fibrous-dysplasia
#10
Timothy R DeKlotz, S Tonya Stefko, Juan C Fernandez-Miranda, Paul A Gardner, Carl H Snyderman, Eric W Wang
Objective To evaluate visual outcomes and potential complications for optic nerve decompression using an endoscopic endonasal approach (EEA) for fibrous dysplasia. Design Retrospective chart review of patients with fibrous dysplasia causing extrinsic compression of the canalicular segment of the optic nerve that underwent an endoscopic endonasal optic nerve decompression at the University of Pittsburgh Medical Center from 2010 to 2013. Main Outcome Measures The primary outcome measure assessed was best-corrected visual acuity (BCVA) with secondary outcomes, including visual field testing, color vision, and complications associated with the intervention...
February 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/28177485/archelosaurian-color-vision-parietal-eye-loss-and-the-crocodylian-nocturnal-bottleneck
#11
Christopher A Emerling
No abstract text is available yet for this article.
December 26, 2016: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28167406/comparing-humans-and-deep-learning-performance-for-grading-amd-a-study-in-using-universal-deep-features-and-transfer-learning-for-automated-amd-analysis
#12
Philippe Burlina, Katia D Pacheco, Neil Joshi, David E Freund, Neil M Bressler
BACKGROUND: When left untreated, age-related macular degeneration (AMD) is the leading cause of vision loss in people over fifty in the US. Currently it is estimated that about eight million US individuals have the intermediate stage of AMD that is often asymptomatic with regard to visual deficit. These individuals are at high risk for progressing to the advanced stage where the often treatable choroidal neovascular form of AMD can occur. Careful monitoring to detect the onset and prompt treatment of the neovascular form as well as dietary supplementation can reduce the risk of vision loss from AMD, therefore, preferred practice patterns recommend identifying individuals with the intermediate stage in a timely manner...
January 27, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28166717/protanopia-red-color-blindness-in-medaka-a-simple-system-for-producing-color-blind-fish-and-testing-their-spectral-sensitivity
#13
Noriko Homma, Yumi Harada, Tamaki Uchikawa, Yasuhiro Kamei, Shoji Fukamachi
BACKGROUND: Color perception is important for fish to survive and reproduce in nature. Visual pigments in the retinal photoreceptor cells are responsible for receiving light stimuli, but the function of the pigments in vivo has not been directly investigated in many animals due to the lack of color-blind lines and appropriate color-perception tests. METHODS: In this study, we established a system for producing color-blind fish and testing their spectral sensitivity...
February 6, 2017: BMC Genetics
https://www.readbyqxmd.com/read/28165171/less-is-more-neural-activity-during-very-brief-and-clearly-visible-exposure-to-phobic-stimuli
#14
Paul Siegel, Richard Warren, Zhishun Wang, Jie Yang, Don Cohen, Jason F Anderson, Lilly Murray, Bradley S Peterson
Research on automatic processes in fear has emphasized the provocation of fear responses rather than their attenuation. We have previously shown that the repeated presentation of feared images without conscious awareness via backward masking reduces avoidance of a live tarantula in spider-phobic participants. Herein we investigated the neural basis for these adaptive effects of masked exposure. 21 spider-phobic and 21 control participants, identified by a psychiatric interview, fear questionnaire, and approaching a live tarantula, viewed stimuli in each of three conditions: (1) very brief exposure (VBE) to masked images of spiders, severely limited awareness; (2) clearly visible exposure (CVE) to spiders, full awareness; and (3) masked images of flowers (control), severely limited awareness...
February 6, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28162197/-influence-of-wearing-long-wavelength-filter-glasses-on-refractive-development-of-children-s-hyperopia
#15
J Huang, Z Q Yu, R Y Chu, Y S Qian, Y Xu, X Q Wang
Objective: To investigate the effect of wearing long wavelength filter glasses on refractive development of children's hyperopia. Methods: Case control study. Seventeen 5-7 years' old children with high hyperopia from optometry clinic of Eye and ENT Hospital Affiliated to Fudan University were enrolled in this research. The experiment design was self-control between right and left eye, 3 children were lost during two years' period of observation, all the children's hyperopic refraction were more than +6.00 D, cycloplegic by 1% atropine...
January 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28159970/the-clinical-phenotype-of-cnga3-related-achromatopsia-pretreatment-characterization-in-preparation-of-a-gene-replacement-therapy-trial
#16
Ditta Zobor, Annette Werner, Franco Stanzial, Francesco Benedicenti, Günther Rudolph, Ulrich Kellner, Christian Hamel, Sten Andréasson, Gergely Zobor, Torsten Strasser, Bernd Wissinger, Susanne Kohl, Eberhart Zrenner
Purpose: The purpose of this study was to clinically characterize patients with CNGA3-linked achromatopsia (CNGA3-ACHM) in preparation of a gene therapy trial. Methods: Thirty-six patients (age 7-56 years) with complete (cACHM) or incomplete (iACHM) CNGA3-ACHM were examined, including detailed psychophysical tests, extended electrophysiology, and assessment of morphology by fundus autofluorescence and spectral-domain optical coherence tomography (SD-OCT). Results: Mean best-corrected visual acuity was 0...
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28158144/space-grating-optical-structure-of-the-retina-and-rgb-color-vision
#17
Norbert Lauinger
Diffraction of light at the spatial cellular phase grating outer nuclear layer of the retina could produce Fresnel near-field interferences in three RGB diffraction orders accessible to photoreceptors (cones/rods). At perpendicular light incidence the wavelengths of the RGB diffraction orders in photopic vision-a fundamental R-wave with two G+B-harmonics-correspond to the peak wavelengths of the spectral brightness sensitivity curves of the cones at 559 nmR, 537 nmG, and 447 nmB. In scotopic vision the R+G diffraction orders optically fuse at 512 nm, the peak value of the rod's spectral brightness sensitivity curve...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28143742/cone-genesis-tracing-by-the-chrnb4-egfp-mouse-line-evidences-of-cellular-material-fusion-after-cone-precursor-transplantation
#18
Sarah Decembrini, Catherine Martin, Florian Sennlaub, Sylvain Chemtob, Martin Biel, Marijana Samardzija, Alexandre Moulin, Francine Behar-Cohen, Yvan Arsenijevic
The cone function is essential to mediate high visual acuity, color vision, and daylight vision. Inherited cone dystrophies and age-related macular degeneration affect a substantial percentage of the world population. To identify and isolate the most competent cells for transplantation and integration into the retina, cone tracing during development would be an important added value. To that aim, the Chrnb4-EGFP mouse line was characterized throughout retinogenesis. It revealed a sub-population of early retinal progenitors expressing the reporter gene that is progressively restricted to mature cones during retina development...
January 28, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28143576/enhancement-of-autonomic-and-psychomotor-arousal-by-exposures-to-blue-wavelength-light-importance-of-both-absolute-and-relative-contents-of-melanopic-component
#19
Emi Yuda, Hiroki Ogasawara, Yutaka Yoshida, Junichiro Hayano
BACKGROUND: Blue light containing rich melanopsin-stimulating (melanopic) component has been reported to enhance arousal level, but it is unclear whether the determinant of the effects is the absolute or relative content of melanopic component. We compared the autonomic and psychomotor arousal effects of melanopic-enriched blue light of organic light-emitting diode (OLED) with those of OLED lights with lesser absolute amount of melanopic component (green light) and with greater absolute but lesser relative content (white light)...
January 31, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28139078/the-effectiveness-of-a-shade-matching-training-program-on-the-dentists-ability-to-match-teeth-color
#20
Reem Alkhudairy, Esam Tashkandi
AIM OF THE STUDY: To study the effectiveness of a structured shade-match training program on dentists' ability to match teeth colors. METHODS: Forty dentists were selected by convenient sampling with normal color vision. The training program is based on visual attention concept and was divided into two parts (educational and training module). Level of knowledge of color was assessed pre and post using a questionnaire. Shade-matching ability was assessed pre and post by using four tabs of the VITA Linearguide 3D-MASTER shade guide (4R1...
January 31, 2017: Journal of Esthetic and Restorative Dentistry
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