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Cortical Deficits are Correlated with Impaired Stereopsis in Patients with Strabismus

Neuroscience Bulletin 2023年第7期39卷 1039-1049页

作者： Sida Xi Yulian Zhou Jing Yao Xinpei Ye Peng Zhang Wen Wen Chen Zhao Department of Ophthalmology and Visual Science Eye and ENT HospitalShanghai Medical CollegeFudan UniversityShanghai 200031China State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Institutes of Brain ScienceFudan UniversityShanghai 200031China Key Laboratory of Myopia Fudan UniversityMinistry of HealthShanghai 200031China Shanghai Key Laboratory of Visual Impairment and Restoration Fudan UniversityShanghai 200031China Department of Radiology Eye and ENT HospitalShanghai Medical CollegeFudan UniversityShanghai 200031China State Key Laboratory of Brain and Cognitive Science Institute of BiophysicsChinese Academy of SciencesBeijing 100101China

In this study,we explored the neural mechanism underlying impaired stereopsis and possible functional plasticity after strabismus *** enrolled 18 stereo-deficient patients with intermittent exotropia before and after surgery,along with 18 healthy *** magnetic resonance imaging data were collected when participants viewed three-dimensional *** with controls,preoperative patients showed hypoactivation in higher-level dorsal(visual and parietal)areas and ventral visual ***-and postoperative activation did not significantly differ in patients overall;patients with improved stereopsis showed stronger postoperative activation than preoperative activation in the right V3A and left intraparietal *** stereopsis and fusional control were correlated with preoperative hypoactivation,suggesting that cortical deficits along the two streams might reflect impaired stereopsis in intermittent *** correlation between improved stereopsis and activation in the right V3A after surgery indicates that functional plasticity may underlie the improvement of ***,additional postoperative strategies are needed to promote functional plasticity and enhance the recovery of stereopsis.

关键词： Stereopsis binocular disparity Functional magnetic resonance imaging Strabismus Intermittent exotropia

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基于神经网络的双目视差估计

基于神经网络的双目视差估计

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作者： Rojanakat Payomrat 哈尔滨工程大学

学位级别：硕士

In recent years, Vision Systems have found their ways into many applications. This includes fields such as computer graphics, medical, industries such as assembly line inspection and object manipulation. The application of Computer Vision technology to factory automation, Machine Vision, is growing at rapid rate. However in most Machine Vision systems an algorithm is needed to infer 3D information regarding the objects in the field of view.In this thesis presents an updated Stereo Matching Algorithm of MSOM (Modify Self Organized Maps). This technique based on artificial neural network. Using the learning rule to similarity and differentiation of both sides of the eyes to find the most overlapping position of the images, give the best clarity for human visualization of 3D images, in the machine procedure on stereo vision problems. Feature selection and extraction is an important step for disparity plan. Through studying of several feature detector method found that image gradient filter has direction and can calculate the horizontal, vertical and diagonal direction of the image and provides enough information regarding the critical points that an object can be characterized.In original MSOM algorithm estimating the disparity and shown the result in gray scale cannot see the distance of the objects. In this method we used a self-adapting dissimilarity measure for extract a disparity plane. Then estimating disparity by update the original MSOM to calculate the disparity and also indicate the depth of the objects in the image. Red color represents nearest object then Green and Blue represent to furthest object.

关键词： binocular disparity stereo-pair modify self-organizing map (MSOM) stereo matching self-adapting dissimilarity measure

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AB019. A proposed test of stereovision to identify local retinal abnormalities

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Annals of Eye Science 2019年第1期 194-194页

作者： Tenia Wang Alex S.Baldwin Robert F.Hess Faculty of Science McGill UniversityMontrealQCCanada Department of Ophthalmology Montreal General HospitalMcGill UniversityMontrealQCCanada

Background:The human visual system extracts depth information from disparity in the images seen by the two *** ability to calculate depth from disparity will be disrupted if local retinal abnormalities distort parts of those images,especially if these distortions are different in the two *** its early stages,age-related macular degeneration(AMD)causes slight distortions in the central vision field which differ in the two *** is the most common form of irreversible blindness in people over the age of *** goal of this project is to develop a stereoscopic perception test which leverages the sensitivity of binocular depth perception to detect the interocular differences symptomatic of either early-stage AMD or other diseases affecting the ***:A program was written in MATLAB that allowed separate left and right eye stimuli to be shown to the two *** 3D Vision 2 stereoscopic glasses were used to present the *** test we have developed consists of random dot patterns covering the central 5 degrees of *** or more disk-shaped perturbations in depth are displayed at different locations in the visual field of the *** the ten possible target locations,we present between one and four disks on each *** disks will only be visible if there is an undistorted input for that visual field location from the two *** participant uses a keypad to report the number of floating disks seen.A set of trials with randomized locations and numbers of disks is used to gather initial data on likely areas of stereoscopic vision deficit;afterwards,likelihoods for deficits in each location are calculated and used to generate customized subsequent ***:The software to perform the local stereovision test has been developed and is now being *** are currently collecting data from healthy normal subjects prior to applying the test to clinical *** order to simulate the central vision distortions of AMD,patches

关键词： Age-related macular degeneration(AMD) stereovision binocular disparity stereoscopic perception

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