scholarly journals Crowded visual search in children with normal vision and children with visual impairment

2014 ◽  
Vol 96 ◽  
pp. 65-74 ◽  
Author(s):  
Bianca Huurneman ◽  
Ralf F.A. Cox ◽  
Björn N.S. Vlaskamp ◽  
F. Nienke Boonstra
Keyword(s):  
Visual Search ◽  
Visual Impairment ◽  
Normal Vision

A comparative study of the perception of music emotion between adults with and without visual impairment

2017 ◽  
Vol 47 (2) ◽  
pp. 225-240 ◽  
Author(s):  
Hye Young Park ◽  
Hyun Ju Chong
Keyword(s):  
Visual Impairment ◽  
Visual Experience ◽  
Emotional Responses ◽  
Emotional Valence ◽  
Music Listening ◽  
Normal Vision ◽  
Emotion Identification ◽  
Musical Preference ◽  
Specific Emotion ◽  
Main Factor

In music listening, limitations on visual experience affect a listener’s abstract information processing and conceptualization of the music. The aim of this study is to examine the differences in emotional responses to music between adults with visual impairment (VI) and adults with normal vision (NV). By using specific, emotion-inducing music reflecting happiness, sadness, anger, and fear, this study considers factors such as music emotion identification, emotional valence, arousal, intensity, and musical preference. A total of 120 participants (60 VI and 60 NV) listened to sixteen 15-second music excerpts and reported which emotion and to what extent they perceived it, using a self-reported music emotion evaluation scale. The results indicated that both of the groups showed high congruence in music emotion identification. However, the VI group showed significantly higher arousal, intensity and preference for sadness, while showing the lowest score for the intensity of fear. The main factor affecting emotion identification was preference for the VI group, and valence for the NV group.

scholarly journals A Development of Multi-Language Interactive Device using Artificial Intelligence Technology for Visual Impairment Person

2021 ◽  
Vol 15 (19) ◽  
pp. 79
Author(s):  
Norharyati Binti Harum ◽  
Nur’aliah Izzati M. S. K ◽  
Nurul Akmar Emran ◽  
Noraswaliza Abdullah ◽  
Nurul Azma Zakaria ◽  
...  
Keyword(s):  
Visual Impairment ◽  
Performance Test ◽  
Blind People ◽  
Normal Vision ◽  
Text To Speech ◽  
Public Places ◽  
Reading Device ◽  
Current Product ◽  
Artificial Intelligence Technology ◽  
Audio Output

<p class="0abstract">The issue of lacking reference books in braille in most public building is crucial, especially public places like libraries, museum and others. The visual impairment or blind people is not getting the information like we normal vision do. Therefore, a multi languages reading device for visually impaired is built and designed to overcome the limitation of reference books in public places. Some research regarding current product available is done to develop a better reading device. This reading device is an improvement from previous project which only focuses on single language which is not suitable for public places. This reading device will take a picture of the book using 5MP Pi camera, Google Vision API will extract the text, and Google Translation API will detect the language and translated to desired language based on push buttons input by user. Google Text-to-Speech will convert the text to speech and the device will read out aloud in through audio output like speaker or headphones.   A few testings have been made to test the functionality and accuracy of the reading device. The testings are functionality, performance test and usability test. The reading device passed most of the testing and get a score of 91.7/100 which is an excellent (A) rating<strong>.</strong></p>

Visual acuity and risk of overall, injury-related, and cardiovascular mortality: the Kangbuk Samsung Health Study

2021 ◽  
Author(s):  
So Young Han ◽  
Yoosoo Chang ◽  
Hocheol Shin ◽  
Chul Young Choi ◽  
Seungho Ryu
Keyword(s):  
Visual Acuity ◽  
Visual Impairment ◽  
Cardiovascular Mortality ◽  
Health Study ◽  
Normal Vision ◽  
Vital Status ◽  
Hazard Ratios ◽  
Risk Of Mortality ◽  
Increased Risk

Abstract Aims  The associations of visual impairment (VI) with cardio-metabolic risk factors have been reported but its association with cardiovascular mortality remains uncertain. Therefore, we evaluated the association of visual acuity (VA) with overall, injury-related, and cardiovascular mortality. Methods and results A cohort study was performed in 580 746 Korean adults (average age, 39.7 years) who were followed for a median of 8.1 years (maximum, 16 years). Presenting VA was measured by the Early Treatment Diabetic Retinopathy Study (ETDRS) chart. Visual acuity in the better vision eye was categorized as normal vision (≥0.8), lowered vision (0.5–0.8), mild visual impairment (VI) (0.3–0.5), or moderate to severe VI (&lt;0.3). Vital status and cause of death were ascertained through linkage to national death records. During 4 632 892.2 person-years of follow-up, 6585 overall deaths, 974 cardiovascular deaths, and 1163 injury-related deaths were identified. After adjustment for possible confounders, the multivariable-adjusted hazard ratios (HRs) with 95% confidence intervals (CIs) for overall mortality among participants with lowered vision, minimal VI, and moderate to severe VI were 1.21 (1.13–1.29), 1.26 (1.15–1.37), and 1.54 (1.40–1.68), respectively, compared with those with normal vision. The corresponding HRs (95% CIs) for injury-related mortality were 1.12 (0.96–1.32), 0.98 (0.76–1.26), and 1.36 (1.04–1.79), respectively, and the corresponding HRs (95% CIs) for cardiovascular mortality were 1.32 (1.12–1.57), 1.43 (1.15–1.77), and 2.41 (1.94–2.99). Conclusion  In this large cohort of young and middle-aged individuals, VI was associated with increased risk of mortality especially due to cardiovascular disease.

Visual Search Performance in Cerebral Visual Impairment is Associated with Altered Alpha Band Oscillations

2021 ◽  
pp. 108011
Author(s):  
Christopher R. Bennett ◽  
Corinna M. Bauer ◽  
Peter J. Bex ◽  
Davide Bottari ◽  
Lotfi B. Merabet
Keyword(s):  
Visual Search ◽  
Visual Impairment ◽  
Search Performance ◽  
Alpha Band ◽  
Cerebral Visual Impairment

scholarly journals Assessment of Bacterial Profile of Ocular Infections among Subjects Undergoing Ivermectin Therapy in Onchocerciasis Endemic Area in Nigeria

2019 ◽  
pp. 1-9
Author(s):  
Okeke-Nwolisa, Benedictta Chinweoke ◽  
Enweani, Ifeoma Bessie ◽  
Oshim, Ifeanyi Onyema ◽  
Urama, Evelyn Ukamaka ◽  
Olise, Augustina Nkechi ◽  
...  
Keyword(s):  
Visual Impairment ◽  
Endemic Area ◽  
Test Group ◽  
Signs And Symptoms ◽  
Control Group ◽  
Age Group ◽  
Normal Vision ◽  
Bacterial Conjunctivitis ◽  
Anambra State ◽  
Ocular Infections

Bacteria are the major contributor of ocular infections worldwide. This can damage the structures of the eye with possible blindness and visual impairments, if left untreated. This study was undertaken   to determine bacterial agents of conjunctivitis among individuals from onchocerciasis endemic area in Anambra State, Nigeria. This was a cross-sectional study involving ninety-two (92) randomly recruited  test  subjects  undergoing ivermectin therapy aged between 11-80 years with signs and symptoms of  onchocerciasis infection and bacterial conjunctivitis at Isu-Anaocha community in  Anambra state between October and November, 2016. Ninety-two (92) apparently healthy subjects without signs and symptoms of onchocerciasis and bacterial conjunctivitis with normal vision, within the age of 11-80 years from the same community were used as control subjects, making a total of 184 participants. Visual acuity test was conducted on the participants using Snellen’s alphabet chart and illiterate E   chart.  Phenotypic   and antibiotic susceptibility tests of these isolates were   carried out according to  Kirby - Bauer disc diffusion method guidelines. In the test group, 22 out of 92 conjunctival samples yielded bacterial growth, giving percentage prevalence of 23.9%, with age group 41-50 years having the highest frequency 7(31.8%) among individuals co-infected with onchocerciasis infection whereas 72 out of 92 conjunctival samples in the control group yielded bacterial growth giving percentage prevalence of 78.3%, with age group 41-50 years having the highest frequency 35(37.2%) among individuals that had  no signs and symptoms of onchocerciasis infection. The predominant bacteria isolated was Staphylococcus   aureus 8(36%) in the test group and 20 (28%) in the control group, giving a total of 28 (30%). Other bacterial isolates were Streptococcus pneumoniae 17 (18%), Staph. epidermidis 15 (16%), Escherichia coli 13(14%), Pseudomonas aeruginosa 12(13%) and Salmonella spp. 9(9%). Antibiotic susceptibility testing showed that Gentamicin and fluoroquinolones are most active against Gram positive bacteria in conjunctivitis while Augmentin was found to be the most active against Gram negative organisms, therefore, recommended as first line drug. Visual acuity (VA) test done on the test group showed that 52 (57%) persons had   normal vision, 20 (22%) had mild visual impairment, 15 (16%) had moderate visual impairment, 5(5%) had severe visual impairment but none was blind. All forms of visual impairment are not wholly attributable to bacterial conjunctivitis as some could be due to ageing and uncorrected refractive errors.

scholarly journals Alpha Oscillatory Activity Associated with Impaired Visual Search in Cerebral Visual Impairment

2020 ◽  
Author(s):  
Christopher Bennett ◽  
Corinna Bauer ◽  
Peter Bex ◽  
Davide Bottari ◽  
LOTFI MERABET
Keyword(s):  
Visual Search ◽  
Visual Impairment ◽  
Spatial Processing ◽  
Oscillatory Activity ◽  
Search Performance ◽  
Success Rates ◽  
Thalamic Nuclei ◽  
Time Frequency ◽  
Visual Spatial ◽  
Visual Spatial Processing

Abstract Cerebral (cortical) visual impairment (CVI) is associated with perinatal damage to retrochiasmatic pathways and cerebral structures. Individuals with CVI often present with impairments in visual spatial processing and attention. However, the neural correlates associated with these higher order perceptual deficits remain unknown. In this study, we investigated visual search performance using a novel virtual reality based task combined with electroencephalography (EEG) and time frequency decomposition of recorded oscillatory activity. We found that CVI participants showed impaired visual search performance (indexed by both decreased success rates and increased reaction times) compared to age matched controls. Furthermore, analysis of captured EEG activity revealed that posterior alpha desynchronization (typically associated with coordinating neural activity in perceptual and cognitive tasks) was greatly impaired in CVI compared to control participants. Finally, exploratory analysis suggested a potential association between amplitude of oscillations in the alpha range and morphometric anatomical measures. Specifically, less alpha desynchronization following stimulus onset was correlated with decreased volume of specific thalamic nuclei. These results suggest that in the setting of early neurological damage to retrochiasmatic visual pathways, alpha desynchronization remains greatly impaired and may be related to deficits in visual spatial processing and attention commonly observed in this population.

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