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Gender differences in the burden of near vision loss in China:An analysis based on GBD 2021 data
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作者 LIU Yu ZHU Liping +4 位作者 LIN Yanhui WANG Yanbing XIONG Kun LI Xuhong YAN Wenguang 《中南大学学报(医学版)》 北大核心 2025年第6期1030-1041,共12页
Objective:Near vision loss(NVL)is one of the leading causes of visual impairment worldwide,exerting a profound impact on individual quality of life and socio-economic development.This study aims to analyze the burden ... Objective:Near vision loss(NVL)is one of the leading causes of visual impairment worldwide,exerting a profound impact on individual quality of life and socio-economic development.This study aims to analyze the burden of NVL in China by sex and age groups from 1990 to 2021 and to project trends over the next 15 years.Methods:Using data from the Global Burden of Disease(GBD)2021 database,we conducted descriptive analyses of NVL prevalence in China,calculated age-standardized prevalence rates(ASPR)and age-standardized disability-adjusted life years rates(ASDR)to compare burden differences between sexes and age groups,and applied an autoregressive integrated moving average(ARIMA)model to predict NVL trends for the next 15 years.The model selection was based on best-fit criteria to ensure reliable projections.Results:From 1990 to 2021,China’s ASPR of NVL rose from 10096.24/100000 to 15624.54/100000,and ASDR increased from 101.75/100000 to 158.75/100000.In 2021,ASPR(16551.70/100000)and ASDR(167.69/100000)were higher among females than males(14686.21/100000 and 149.76/100000,respectively).China ranked highest globally in both NVL cases and disability-adjusted life years(DALYs),with female burden significantly exceeding male burden.Projections indicated this trend and sex gap will persist until 2036.Compared with 1990,the prevalence cases and DALYs increased by 239.20%and 238.82%,respectively in 2021,with the highest burden among females and the 55−59 age group.The ARIMA model predicted continued increases in prevalence and DALYs by 2036,with females maintaining a higher burden than males.Conclusion:This study reveals a marked increase in the NVL burden in China and predicts continued growth in the coming years.Public health policies should prioritize NVL prevention and control,with special attention to women and middle-aged populations to mitigate long-term societal and health impacts. 展开更多
关键词 China near vision loss Global Burden of Disease database autoregressive integrated moving average model gender differences
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Visual impairment and depression: Age-specific prevalence, associations with vision loss, and relation to life satisfaction 被引量:5
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作者 Audun Brunes Trond Heir 《World Journal of Psychiatry》 SCIE 2020年第6期139-149,共11页
BACKGROUND To our knowledge,no study has obtained specific estimates of depression for young and middle-aged adults with visual impairment(VI).As estimates of depression varies across age groups in the general populat... BACKGROUND To our knowledge,no study has obtained specific estimates of depression for young and middle-aged adults with visual impairment(VI).As estimates of depression varies across age groups in the general population,it is of interest to examine whether the same applies to adults with low vision or blindness.AIM To estimate depression prevalence and its association with VI-related characteristics and life satisfaction in adults with VI.METHODS A telephone-based cross-sectional survey was conducted between January and May 2017 in an age-stratified sample of adults who were members of the Norwegian Association of the Blind and Partially Sighted.Participants were asked questions about their sociodemographic characteristics,VI characteristics,and life satisfaction.Depression was measured with the Patient Health Questionnaire.The diagnostic scoring algorithm was used to calculate the point prevalence of depression(i.e.,major depression and other depressive disorders)across categories of gender and age(years:18-35,36-50,51-65,≥66).The associations were estimated using regression models.RESULTS Overall,736 adults participated in the study(response rate:61%).The prevalence estimates of depression varied across different age groups,ranging from 11.1%-22.8%in women and 9.4%-16.5%in men,with the highest rates for the two youngest age groups.Results from the multivariable models including sociodemographic and VI-related variables showed that losing vision late in life[Prevalence ratio(PR),1.76,95%CI:1.11,2.79]and having other impairments(PR:1.88,95%CI:1.32,2.67)were associated with higher rates of depression,whereas older age was associated with lower rates(PR:0.83,95%CI:0.74,0.93).Additionally,participants who were depressed had lower life satisfaction than those who were not depressed(adjustedβ:-2.36,95%CI:-2.75,-1.98).CONCLUSION Our findings suggest that depression in adults with VI,and especially among young and middle-aged adults,warrants greater attention by user organisations,clinicians,and healthcare authorities. 展开更多
关键词 BLINDNESS DEPRESSION Life satisfaction Major depression vision loss Visual impairment
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Visual function and biofeedback training of patients with central vision loss:a review
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作者 Yu Deng Chuan-Hong Jie +2 位作者 Jian-Wei Wang Yuan-Yuan Li Zi-Qiang Liu 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2023年第5期824-831,共8页
Older individuals with macular diseases,such as age-related macular degeneration,experience central vision loss(CVL)due to degeneration of their photoreceptors and retinal cells.Patients with CVL may experience variou... Older individuals with macular diseases,such as age-related macular degeneration,experience central vision loss(CVL)due to degeneration of their photoreceptors and retinal cells.Patients with CVL may experience various vision impairments,including of visual acuity,fixation stability,contrast sensitivity,and stereoacuity.After CVL,most patients develop a preferred retinal locus outside the affected macular region,which serves as a new visual reference.In this review,we provide an overview of the visual function and impairment in individuals with CVL.In addition,the important role of biofeedback training on the visual function and activity of individuals with CVL is also reviewed.Accordingly,the location and development of the preferred retinal loci are discussed.Finally,this review discusses how to conduct biofeedback training to treat individuals with CVL. 展开更多
关键词 central vision loss biofeedback training preferred retinal locus visual acuity macular disease
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AB031.Exploring the facilitators and barriers encountered by adults and seniors with acquired vision loss who pursue braille training
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作者 Natalie Martiniello Walter Wittich 《Annals of Eye Science》 2019年第1期206-206,共1页
Background:As the prevalence of age-related vision loss continues to increase,vision rehabilitation practitioners will encounter a growing number of older adults who experience reading-related difficulties.Braille may... Background:As the prevalence of age-related vision loss continues to increase,vision rehabilitation practitioners will encounter a growing number of older adults who experience reading-related difficulties.Braille may be considered as an alternative to sight enhancement options for clients with progressive or significant visual pathologies.However,little is known about the impact of aging on braille reading performance.The goal of this research was to explore the experiences of older adults with acquired vision loss who have learned braille later in life,and to better understand the facilitators and barriers encountered throughout this process.Methods:Qualitative interviews were conducted by telephone with 14 participants from across Canada(age 40-72,Mdn=55.5,7 female).All participants learned braille in adulthood(starting age 33-60,Mdn=46.5).Recorded interviews were transcribed verbatim and later analyzed by two independent researchers based on the phenomenological method of analysis.Results:Personal,social and environmental factors were shown to influence the braille-learning process.In particular,prior learning experiences(both positive and negative)were shown to impact both the decision to learn braille and participant training experiences.Participants highlighted the importance of perceived support from family and friends,and reactions towards braille from the general public posed a barrier to those still adjusting to vision loss.Participants also highlighted the value of knowing others who learned braille later in life.Conversely,a reoccurring environmental barrier that emerged was the perceived response from rehabilitation practitioners who believed that clients should not or could not learn braille due to their age,as well as the lack of available resources to facilitate training.Conclusions:Results highlight the need to explore the influence of stereotypes associated with aging,blindness and braille,and the degree to which this may impact opportunities for clients who may benefit from braille training.Though previous learning experiences appear to influence successful rehabilitation outcomes,these factors are not routinely considered during the braille assessment process.Our findings will therefore contribute to future research and the development of assessments to better meet the needs of older adults who pursue braille training. 展开更多
关键词 BRAILLE aging rehabilitation BLINDNESS vision loss
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Tone Task Proves Blind Hear Better--Early vision loss leads to keener hearing
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作者 Michael Hopkin 于明霞 《当代外语研究》 2004年第12期8-6,共2页
盲人音乐家的才华洋溢是纯属巧合,还是由于潜能的凝聚呢?加拿大的科学家们发现:年幼失明的盲者对于乐音变化的察觉能力确实远远强于后天失明者及普通人。
关键词 Early vision loss leads to keener hearing Tone Task Proves Blind Hear Better
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Vision care and the sustainable development goals: a brief review and suggested research agenda
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作者 Nathan Congdon Brad Wong +1 位作者 Xinxing Guo Graeme MacKenzie 《Eye Science》 2025年第2期103-110,共8页
Blindness affected 45 million people globally in 2021,and moderate to severe vision loss a further 295 million.[1]The most common causes,cataract and uncorrected refractive error,are generally the easiest to treat,and... Blindness affected 45 million people globally in 2021,and moderate to severe vision loss a further 295 million.[1]The most common causes,cataract and uncorrected refractive error,are generally the easiest to treat,and are among the most cost-effective procedures in all of medicine and international development.[1-2]Thus,vision impairment is both extremely common and,in principle,readily manageable. 展开更多
关键词 vision care CATARACT cost effective procedures uncorrected refractive error BLINDNESS moderate severe vision loss uncorrected refractive errorare sustainable development goals
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Targeting Wallerian degeneration in glaucoma
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作者 Melissa Jöe Pete A.Williams 《Neural Regeneration Research》 2026年第2期693-694,共2页
Neurodegenerative diseases account for a large and increasing health and economic burden worldwide.With an increasingly aged population,this burden is set to increase.Optic neuropathies make up a large proportion of n... Neurodegenerative diseases account for a large and increasing health and economic burden worldwide.With an increasingly aged population,this burden is set to increase.Optic neuropathies make up a large proportion of neurodegenerative diseases with glaucoma being highly prevalent.Glaucoma is characterized by the progressive dysfunction and loss of retinal ganglion cells and their axons which make up the optic nerve.It is the leading cause of irreversible vision loss and affects an estimated 80 million people.The mammalian central nervous system is non-regenerative and,once lost or injured,retinal ganglion cells cannot regenerate an axon into the optic nerve under basal conditions.Thus,strategies that provide neuroprotection to stressed,dysfunctional,or dying retinal ganglion cells are likely to be of high therapeutic and translational value.Advancing age,genetics,and elevated intraocular pressure are all major risk factors for glaucoma,however,all clinically available glaucoma treatments focus on intraocular pressure management and do not directly address the neurodegenerative component of glaucoma. 展开更多
关键词 health burden neurodegenerative diseases aged population Wallerian degeneration GLAUCOMA vision loss economic burden retinal ganglion cells their axons
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Tocilizumab as an effective treatment option for idiopathic orbital inflammation:a case report and literature review
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作者 Hai-Yang Zhang Hui-Jie Zhang Hui-Fang Zhou 《International Journal of Ophthalmology(English edition)》 2026年第1期199-201,共3页
Dear Editor,Idiopathic orbital inflammation(IOI),also known as orbital inflammatory pseudotumor,is a relatively common orbital disorder[1].Its pathogenesis remains unclear,often regarded as a nonspecific immune-mediat... Dear Editor,Idiopathic orbital inflammation(IOI),also known as orbital inflammatory pseudotumor,is a relatively common orbital disorder[1].Its pathogenesis remains unclear,often regarded as a nonspecific immune-mediated response[2].IOI presents with symptoms such as pain,photophobia,proptosis,eyelid swelling,edema,conjunctival congestion,and diplopia,with possible vision loss occurring in some cases.Based on the soft tissue structures involved,IOI can be classified into subtypes such as myositis,optic neuritis,dacryoadenitis,diffuse orbital inflammation,and orbital inflammatory masses[2]. 展开更多
关键词 soft tissue structures idiopathic orbital inflammation orbital disorder its vision loss myositisoptic neuriti orbital inflammatory pseudotumoris orbital inflammation ioi also orbital inflammatory pseudotumor
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中国55岁及以上人群失明和视力损伤的疾病负担及变化趋势:2021年全球疾病负担研究分析
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作者 谢婧 杨梅 +5 位作者 蒲丽 王正静 胡红芳 姜莎莎 冯亮 赵粟 《眼科新进展》 北大核心 2026年第2期128-133,共6页
目的分析1990—2021年中国≥55岁人群失明和视力损伤(BVL)的疾病负担及变化趋势,为相关防治政策和措施的制定提供科学依据。方法在全球疾病负担数据库(GBD)2021中检索1990—2021年中国≥55岁BVL患者数据,包括患病率、患病人数、伤残调... 目的分析1990—2021年中国≥55岁人群失明和视力损伤(BVL)的疾病负担及变化趋势,为相关防治政策和措施的制定提供科学依据。方法在全球疾病负担数据库(GBD)2021中检索1990—2021年中国≥55岁BVL患者数据,包括患病率、患病人数、伤残调整寿命年(DALYs)和DALYs率,采用分段回归模型分析BVL患病情况和DALYs的趋势变化,同时分析导致BVL的眼病因素,并运用年龄-时期-队列模型分析BVL的年龄、时期和队列效应。结果2021年中国≥55岁BVL患者的粗患病率和粗DALYs率较1990年分别升高33.48%和8.45%;患病率和DALYs率随增龄而增高,在≥95岁达到最高,分别为66533.68/10万和3482.65/10万,其中女性患者的疾病负担高于男性。1990—2021年中国≥55岁BVL患者标化患病率呈上升趋势,平均年度变化百分比(AAPC)为0.87%(95%CI:0.66~1.07);标化DALYs率变化趋势不显著,AAPC为0.07%(95%CI:-0.11~0.25)。近视力丧失和屈光不正在55~69岁人群中患病率较高,而白内障是老年人群失明和视力损伤的主要病因,其DALYs随年龄增长显著上升。年龄-时期-队列模型结果显示,1990—2021年中国≥55岁BVL患者患病率和DALYs率随年龄增长显著上升,随时期的增加呈现先上升后下降的趋势,随出生队列的递增呈现先下降后上升的趋势。结论1990—2021年中国≥55岁BVL患者标化患病率呈上升趋势,标化DALYs率变化趋势不显著,并且女性群体疾病负担高于男性,随着我国人口老龄化的加剧,提示有关部门应重视对老年群体的干预,制定有效的公共卫生预防政策,以期减轻我国BVL造成的重大疾病负担。 展开更多
关键词 失明和视力损伤 全球疾病负担 患病率 伤残调整寿命年 分段回归模型 年龄-时期-队列模型
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基于YOLOv11n-DEE的蝴蝶兰苗床盆栽检测方法
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作者 张梦琦 韩群勇 +1 位作者 柴琴琴 王武 《农业工程学报》 北大核心 2026年第1期264-272,共9页
针对蝴蝶兰大规模种植管理中幼苗阶段幼苗数量统计不精准、计数效率低的瓶颈问题,该研究提出了基于机器视觉和YOLOv11n-DEE的蝴蝶兰苗床盆栽数量精准识别方法。该方法基于摄像头拍摄的蝴蝶兰苗床幼苗图像构建实际数据集,并针对现有目标... 针对蝴蝶兰大规模种植管理中幼苗阶段幼苗数量统计不精准、计数效率低的瓶颈问题,该研究提出了基于机器视觉和YOLOv11n-DEE的蝴蝶兰苗床盆栽数量精准识别方法。该方法基于摄像头拍摄的蝴蝶兰苗床幼苗图像构建实际数据集,并针对现有目标识别和分割方法在识别存在幼苗密集或遮挡的图像时计数误差大的问题,以YOLOv11n为基础架构构建YOLOv11n-DEE模型以提升幼苗识别精度。YOLOv11n-DEE模型通过引入多元分支模块增强主干网络和颈部网络提升不同尺度目标的检测能力,采用高效解耦检测头平衡检测效率与精度,并以带指数移动平均机制的损失函数为训练目标完成检测模型训练,以有效避免样本不平衡带来的训练倾向性。试验结果显示,与YOLOv11n基线模型相比,该研究所提出的YOLOv11n-DEE模型对蝴蝶兰幼苗计数准确率和mAP@0.5分别提升了5.0、4.0个百分点,参数量减少了10.5%,检测速度提升了2.34帧/s。研究所提出的改进模型可以为蝴蝶兰苗床盆栽精确识别提供技术支持。 展开更多
关键词 YOLOv11n-DEE 蝴蝶兰幼苗 机器视觉 多元分支模块 高效检测头 损失函数
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AB030.Usability of ArtontheBrain:A visual-arts based mobile health solution to promote quality of life in older adults with low vision due to age-related macular degeneration
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作者 Karine Elalouf Mariah Hogan +4 位作者 Swathi Swaminathan Navena Lingum Aviva Altschuler Kelly Murphy Walter Wittich 《Annals of Eye Science》 2019年第1期205-205,共1页
Background:Taking part in productive and enjoyable recreational activities has been shown improve quality of life for people of all ages and capabilities.However,vision loss can have a significant impact on participat... Background:Taking part in productive and enjoyable recreational activities has been shown improve quality of life for people of all ages and capabilities.However,vision loss can have a significant impact on participation in important leisure activities.This is especially the case for the elderly,whose lowered mobility is further impacted by vision loss.Technology can offer solutions to bridging some barriers caused by these deficits by bringing leisure activities to the user in the form of mobile applications.As such,the purpose of the present study was to evaluate the accessibility and usability of the ArtOnTheBrain application,a visual art based mobile health solution to promote brain health and well-being,by older adults with low vision due to age-related macular degeneration(AMD).Methods:There were a total of 16 participants(age range,65-93 years,M=79,10 males).All had a diagnosis of AMD with visual acuities in the better eye between 20/60 and 20/200.Additionally,all participants had accessed rehabilitation services and most had experience using a computer at home.Using an Apple iPad Air(2013),they were asked to interact with the ArtOnTheBrain website’s Learn(e.g.,Listen to artwork description)and Play(e.g.,complete a word-search game)features with either the Safari or Google Chrome Internet apps.Using the Concurrent Think Aloud method,participants were asked to continuously comment on their activities and experiences with the app and verbalize their internal monologue while being audio and video recorded.These recordings were later transcribed verbatim and analysed using qualitative description and thematic analysis.Results:Participants’behaviours and verbal feedback were divided based on whether they presented as barriers or facilitators.Beginning with barriers,these were mostly related to the accessibility of the visual aspects of the applications interface(i.e.,contrast and font size),whereby participants requested additional control over the magnification options,both for text as well as images of the artwork.The main facilitator was the audio option built into the Learn tab,which allowed participants to listen to the artwork descriptions.Facilitators also included the aesthetics of the app,the perceived boost in confidence in interacting with technology,and the educational and leisure benefits.Conclusions:Older adults with low vision are faced with a decreased ability to engage in leisure activities.The development of technologies aimed at increasing the accessibility of leisure activities for these individuals is an important step in increasing their quality of life.As such,despite some of the accessibility challenges,the majority of participants viewed ArtontheBrain positively.Identifying the barriers and facilitators to its use is an important step in the development of this application in order to optimize its accessibility for older adults with low vision.Future work to be done with this application will be to evaluate the cognitive impact of ArtontheBrain on low vision users. 展开更多
关键词 Quality of life leisure activities vision loss mobile health solutions
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优化ViT用于黑色素瘤分类:特征筛选与InfoNCE损失的结合
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作者 黄金杰 马媛雪 《光学精密工程》 北大核心 2025年第16期2649-2660,共12页
针对Vision Transformer(ViT)在黑色素瘤图像分类中存在的特征冗余和泛化能力不足问题,提出一种融合动态特征筛选与对比学习的改进模型,以提升分类精度与临床诊断效率。首先,设计动态特征筛选模块,通过可学习的权重矩阵自适应强化关键... 针对Vision Transformer(ViT)在黑色素瘤图像分类中存在的特征冗余和泛化能力不足问题,提出一种融合动态特征筛选与对比学习的改进模型,以提升分类精度与临床诊断效率。首先,设计动态特征筛选模块,通过可学习的权重矩阵自适应强化关键特征并抑制冗余信息;其次,引入InfoNCE对比损失函数,联合交叉熵损失构建多目标优化框架,增强类间特征区分度;最后,在多头自注意力机制中嵌入关键特征引导机制,实现局部细节与全局语义的协同建模。在ISIC2018和ISIC2019数据集上的实验结果表明:改进模型分类准确率分别达到83.27%和80.17%,较基线ViT模型提升1.83%和0.49%;消融实验验证动态筛选模块减少18.7%冗余计算量,对比学习使类内特征相似度提升23.6%。所提方法显著提高了ViT模型对黑色素瘤的识别能力,分类精度与鲁棒性优于主流模型,为皮肤癌早期诊断提供了高精度、低冗余的自动化解决方案,具有一定的临床实用价值。 展开更多
关键词 图像分类 特征筛选 InfoNCE损失函数 ViT模型
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Central retinal artery occlusion,a non-negligible thrombotic ocular complication of pediatric venoarterial extracorporeal membrane oxygenation:a case report
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作者 Zhi-Bing Zhang Xian Zhang +1 位作者 Hong Yang Bo Chen 《International Journal of Ophthalmology(English edition)》 2025年第11期2210-2212,共3页
Central retinal artery occlusion(CRAO)is an acute ophthalmic emergency,characterized by sudden vision loss due to retinal ischemia in areas corresponding to arterial occlusion sites.Diagnosis primarily relies on fundu... Central retinal artery occlusion(CRAO)is an acute ophthalmic emergency,characterized by sudden vision loss due to retinal ischemia in areas corresponding to arterial occlusion sites.Diagnosis primarily relies on fundus fluorescein angiography(FFA)and optical coherence tomography(OCT),which show delayed retinal artery filling time hours to days after occlusion and increased hyperreflectivity of the inner retina. 展开更多
关键词 optical coherence tomography oct which Venoarterial extracorporeal membrane oxygenation fundus fluorescein angiography ffa Central retinal artery occlusion retinal ischemia arterial occlusion central retinal artery occlusion crao vision loss
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合并嗜酸性粒细胞增多,出现Purtscher样视网膜病变的非典型溶血性尿毒症一例
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作者 梅琦敏 戴佳原 +2 位作者 刘业成 沈敏 朱华栋 《协和医学杂志》 北大核心 2025年第1期256-262,共7页
非典型溶血性尿毒症(atypical hemolytic uremic syndrome,aHUS)是一种由补体异常所引发的罕见病,临床表现以微血管病性溶血性贫血、血小板减少症和急性肾损伤为主要特征。本文报道1例以严重肾功能不全伴双眼视力急进性下降起病的患者,... 非典型溶血性尿毒症(atypical hemolytic uremic syndrome,aHUS)是一种由补体异常所引发的罕见病,临床表现以微血管病性溶血性贫血、血小板减少症和急性肾损伤为主要特征。本文报道1例以严重肾功能不全伴双眼视力急进性下降起病的患者,病程中出现嗜酸性粒细胞增多症,排除其他疾病后诊断为aHUS。予以激素治疗后嗜酸性粒细胞降至正常,血浆置换联合依库珠单抗治疗后肾脏功能趋于稳定,血小板恢复正常,但视力无明显改善。本文回顾该患者的诊治历程并结合文献复习,以期为临床医师提供借鉴。 展开更多
关键词 非典型溶血尿毒综合征 嗜酸性粒细胞增多症 肾功能不全 视力下降
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基于深度学习的双目立体匹配研究进展与分析
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作者 洪岩 赵起 +3 位作者 曹越 何超 张聪炫 陈震 《南昌航空大学学报(自然科学版)》 2025年第1期1-19,107,共20页
传统立体匹配算法通过匹配人工设计的特征描述来实现,但对遮挡、弱纹理及重复纹理及边缘等区域的计算效果并不理想。近年来,基于深度学习的立体匹配算法研究成为该领域的主流方向,且在算法性能及鲁棒性上均得到较大提升。为了系统梳理... 传统立体匹配算法通过匹配人工设计的特征描述来实现,但对遮挡、弱纹理及重复纹理及边缘等区域的计算效果并不理想。近年来,基于深度学习的立体匹配算法研究成为该领域的主流方向,且在算法性能及鲁棒性上均得到较大提升。为了系统梳理基于深度学习的立体匹配算法的研究现状与发展趋势,对立体匹配算法原理、传统立体匹配算法、基于深度学习的端到端及非端到端的立体匹配算法进行介绍,并对相关训练方法、损失函数及常用公开数据集进行总结,同时在常用数据集上对各类代表性算法进行对比分析,最后对立体匹配算法将面临的挑战和未来发展方向进行讨论。 展开更多
关键词 立体匹配 深度学习 计算机视觉 损失函数 数据集
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两例单眼无痛性视力下降患者的临床分析及文献回顾
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作者 潘媛 陈晓卿 梁丹 《眼科学报》 2025年第8期636-644,共9页
本文报告2例单眼无痛性视力下降病例。病例1为47岁男性,表现为右眼亚急性视力下降,伴视盘水肿及黄斑区星芒状渗出,血清汉塞巴尔通体(Bartonella henselae)IgG抗体阳性(滴度为1:256),结合猫接触史及跳蚤叮咬史,诊断为猫抓病相关视神经视... 本文报告2例单眼无痛性视力下降病例。病例1为47岁男性,表现为右眼亚急性视力下降,伴视盘水肿及黄斑区星芒状渗出,血清汉塞巴尔通体(Bartonella henselae)IgG抗体阳性(滴度为1:256),结合猫接触史及跳蚤叮咬史,诊断为猫抓病相关视神经视网膜炎。经口服多西环素联合球周注射曲安奈德治疗后,视力显著恢复至1.0。病例2为33岁男性,表现为右眼急性视野缺损伴轻度视力下降,视盘水肿伴出血及棉绒斑。血清学检查结果显示汉塞巴尔通体IgG阳性(滴度为1:256)及梅毒螺旋体颗粒凝集试验(treponema pallidum particle agglutination assay,TPPA)(+);甲苯胺红不加热血清试验(toluidine red unheated serum test,TRUST)(+)。初始经验性抗猫抓病(多西环素+利福平)及抗梅毒(苄星青霉素)治疗无效,视力持续下降。随访1个月时光学相干断层扫描(optical coherence tomography,OCT)显示视盘周围视网膜色素上皮(retinal pigment epithelium,RPE)局灶性钉状突起,符合梅毒眼部特征性改变,结合患者抗汉塞巴尔通体治疗反应不佳,最终修正诊断为梅毒性视神经病变。继续驱梅治疗后视力稳定于0.63,但遗留视神经萎缩。2例病例提示感染性视神经病变的诊断需综合病史、临床表现、辅助检查、治疗反应及特征性体征进行鉴别,尤其需审慎解读汉塞巴尔通体抗体血清学阳性结果。 展开更多
关键词 无痛性视力下降 视盘水肿 感染 汉塞巴尔通体 猫抓病 梅毒
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FA-YOLOv7:水面垃圾小目标检测算法
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作者 徐守坤 龚研 李宁 《计算机工程与设计》 北大核心 2025年第8期2328-2334,共7页
为解决水面垃圾检测中小目标比例高、易受光照及环境噪声影响的问题,提出一种基于YOLOv7的改进型检测算法FA-YOLOv7。构建一个上下文信息感知模块(GCFA),解决小目标环境语境信息缺失的难题;引进深度噪声抑制模块(DNSM),降低环境噪声对... 为解决水面垃圾检测中小目标比例高、易受光照及环境噪声影响的问题,提出一种基于YOLOv7的改进型检测算法FA-YOLOv7。构建一个上下文信息感知模块(GCFA),解决小目标环境语境信息缺失的难题;引进深度噪声抑制模块(DNSM),降低环境噪声对检测精度的影响;为增强模型训练的稳定性和提高收敛速度,采用联合回归损失函数。通过水面垃圾检测实际应用的测试,验证了该方案的准确性与有效性。 展开更多
关键词 计算机视觉 小目标检测 水面漂浮垃圾 自注意力机制 损失函数 噪声抑制 深度学习
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基于视觉的人体动作质量评价研究综述 被引量:2
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作者 沈媛媛 张燕明 沈燕飞 《自动化学报》 北大核心 2025年第2期404-426,共23页
基于视觉的人体动作质量评价利用计算机视觉相关技术自动分析个体运动完成情况,并为其提供相应的动作质量评价结果.这已成为运动科学和人工智能交叉领域的一个热点研究问题,在竞技体育、运动员选材、健身锻炼、运动康复等领域具有深远... 基于视觉的人体动作质量评价利用计算机视觉相关技术自动分析个体运动完成情况,并为其提供相应的动作质量评价结果.这已成为运动科学和人工智能交叉领域的一个热点研究问题,在竞技体育、运动员选材、健身锻炼、运动康复等领域具有深远的理论研究意义和很强的实用价值.本文将从数据获取及标注、动作特征表示、动作质量评价3个方面对涉及到的技术进行回顾分析,对相关方法进行分类,并比较分析不同方法在AQA-7、JIGSAWS、EPIC-Skills 2018三个数据集上的性能.最后讨论未来可能的研究方向. 展开更多
关键词 动作质量 评价 计算机视觉 信息获取 特征表示 损失函数
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基于CWD-SPI的铸件表面缺陷检测系统 被引量:1
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作者 孟丽丽 支明亮 +5 位作者 温金龙 刘然 李宏扬 刘伟民 郑直 李宪林 《钢铁》 北大核心 2025年第8期238-251,共14页
针对铸件表面缺陷检测存在精度欠佳、检测速率低等问题,提出基于改进YOLOv8n的铸件表面缺陷目标检测算法SPI,并通过通道级知识蒸馏(channel-wise knowledge distillation,CWD)对算法进行蒸馏训练。首先,设计S-FasterNet网络,并将其替换... 针对铸件表面缺陷检测存在精度欠佳、检测速率低等问题,提出基于改进YOLOv8n的铸件表面缺陷目标检测算法SPI,并通过通道级知识蒸馏(channel-wise knowledge distillation,CWD)对算法进行蒸馏训练。首先,设计S-FasterNet网络,并将其替换为YOLOv8n的主干网络,该网络在降低冗余运算和内存访问量的同时,能分别在水平和垂直维度获取丰富的上下文信息,保留铸件细微部分的特征;然后,提出P-C2f模块,在降低信息损失的同时增强网络的特征表达;同时,引入Inner-CIoU边界框回归损失函数,以提升模型的定位性能;此外,以目标检测算法SPI为基础,利用CWD技术进一步提高模型的检测精度;最后,结合CWD-SPI检测算法和MySQL数据库,开发了铸件表面缺陷检测系统,该系统能够实时执行多种缺陷检测任务,并将检测结果进行存储和分析,有助于实时统计铸件的缺陷信息,提高了检测过程的灵活性和适应性,能够更好地应对不同检测需求。试验结果表明,CWD-SPI目标检测算法在铸件缺陷数据集上的平均精度均值A为85.9%,相较于原YOLOv8n算法提高5.9%,其精确率(Precision)提高5%;改进后的算法能够在增强铸件表面缺陷检测性能的同时,满足铸件缺陷检测的实时性要求。 展开更多
关键词 表面缺陷 改进YOLOv8n算法 目标检测 注意力机制 知识蒸馏 机器视觉 缺陷检测系统 损失函数
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多维度跨模态协同的无参考点云质量评价
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作者 翟晋赫 张滢雪 司占军 《印刷与数字媒体技术研究》 北大核心 2025年第5期101-110,194,共11页
针对现有点云质量评价方法出现的多维度视觉特征融合不充分、跨模态语义对齐不足等问题,本研究提出了一种融合多维度视觉特征与文本语义的无参考点云质量评价框架TriCMA-PCQA。首先,设计了三分支结构,从点云投影图像和点云模型中分别提... 针对现有点云质量评价方法出现的多维度视觉特征融合不充分、跨模态语义对齐不足等问题,本研究提出了一种融合多维度视觉特征与文本语义的无参考点云质量评价框架TriCMA-PCQA。首先,设计了三分支结构,从点云投影图像和点云模型中分别提取纹理、深度和几何3个维度互补的视觉特征,构建多维度质量表征;随后,设计了多维度特征协同注意力机制,实现纹理-深度-几何特征的跨维度交互,增强视觉特征的判别能力与语义表达力;其次,引入文本模态的语义引导,通过可学习的动态文本提示生成质量描述特征,在共同语义空间中对齐文本语义特征与多维度视觉特征,增强模型对人类主观感知机制的模拟能力;最后,在EMD损失基础上融合分位数损失、对比损失及排序损失共同构建混合损失函数,自适应平衡多任务训练目标。实验结果表明,TriCMA-PCQA在SJTU-PCQA和LS-PCQA数据集上性能优于现有方法,与主观质量具有良好的相关性,可为三维内容生成与处理提供可靠的量化评价工具。 展开更多
关键词 无参考点云质量评价 多维度协同注意力 视觉-文本跨模态对齐 混合损失
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