The Experts below are selected from a list of 1767 Experts worldwide ranked by ideXlab platform
Nam Ju Moon - One of the best experts on this subject based on the ideXlab platform.
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clinical evaluation of accommodation and ocular surface stability relavant to visual Asthenopia with 3d displays
BMC Ophthalmology, 2014Co-Authors: Nam Ju MoonAbstract:Background To validate the association between accommodation and visual Asthenopia by measuring objective accommodative amplitude with the Optical Quality Analysis System (OQAS®, Visiometrics, Terrassa, Spain), and to investigate associations among accommodation, ocular surface instability, and visual Asthenopia while viewing 3D displays.
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ophthalmological factors influencing visual Asthenopia as a result of viewing 3d displays
British Journal of Ophthalmology, 2012Co-Authors: Nam Ju Moon, Sohee JeonAbstract:Aims To identify ophthalmological factors influencing Asthenopia as a result of viewing three-dimensional (3D) displays. Methods Thirty adult subjects without ophthalmological abnormality watched the same 3D displays for 30 min. Each subject9s near point of accommodation (NPA) and convergence (NPC), amplitude of fusional convergence and divergence, stereopsis, tear break-up time and temperature of ocular surface, and angle of phoric deviation were measured before and after viewing the 3D displays. In addition, a survey for subjective symptoms was conducted immediately following the viewing of the 3D displays. The above mentioned experiments were performed equally with two-dimensional (2D) displays in the same 30 subjects for detection of innate influence of 3D displays. Results The NPA and NPC in the subjects were significantly altered after watching the 3D displays (p Conclusions Accommodation and binocular vergence are predominant ophthalmological factors that may influence Asthenopia significantly following the viewing of 3D displays. Subjective visual discomfort also significantly increased following the viewing of 3D displays. And there is the need for more detailed evaluation for detecting the practically related factors with Asthenopia.
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P3-1: Ophthalmologic Factors Influencing Asthenopia with Watching 3D Displays
I-perception, 2012Co-Authors: Nam Ju MoonAbstract:Purpose: To identify ophthalmologic factors influencing Asthenopia while watching 3D displays. Methods: 30 adult subjects without ophthalmologic abnormality watched the same 3D displays for 30 minutes. Each subject's far and near visual acuity, near points of accommodation and convergence, amplitude of fusional convergence and divergence, stereopsis, angle of phoric deviation, tear break-up time, and temperature of ocular surface before and after watching 3D displays were measured. And surveys for subjective symptoms right after watching 3D displays were conducted. The above-mentioned experiments were performed equally with 2D displays for detection of innate influence of 3D displays. Results: The near points of accommodation and convergence were significantly changed after watching 3D displays (p < .05) compared to 2D displays. And all 10 subjective symptoms were significantly increased after watching 3D displays (p < .05). Conclusion: The accommodation and binocular vergence are predominant ophthalmologic factors that might influence Asthenopia significantly while watching 3D displays. Subjective visual discomfort significantly increases with watching 3D displays, and more specific evaluation should be added for detecting the practically related factors with Asthenopia
Sohee Jeon - One of the best experts on this subject based on the ideXlab platform.
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ophthalmological factors influencing visual Asthenopia as a result of viewing 3d displays
British Journal of Ophthalmology, 2012Co-Authors: Nam Ju Moon, Sohee JeonAbstract:Aims To identify ophthalmological factors influencing Asthenopia as a result of viewing three-dimensional (3D) displays. Methods Thirty adult subjects without ophthalmological abnormality watched the same 3D displays for 30 min. Each subject9s near point of accommodation (NPA) and convergence (NPC), amplitude of fusional convergence and divergence, stereopsis, tear break-up time and temperature of ocular surface, and angle of phoric deviation were measured before and after viewing the 3D displays. In addition, a survey for subjective symptoms was conducted immediately following the viewing of the 3D displays. The above mentioned experiments were performed equally with two-dimensional (2D) displays in the same 30 subjects for detection of innate influence of 3D displays. Results The NPA and NPC in the subjects were significantly altered after watching the 3D displays (p Conclusions Accommodation and binocular vergence are predominant ophthalmological factors that may influence Asthenopia significantly following the viewing of 3D displays. Subjective visual discomfort also significantly increased following the viewing of 3D displays. And there is the need for more detailed evaluation for detecting the practically related factors with Asthenopia.
M Jimenezvillarruel - One of the best experts on this subject based on the ideXlab platform.
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risk factors for Asthenopia among computer terminal operators
Salud Publica De Mexico, 1996Co-Authors: Francisco Raul Sanchezroman, C Perezlucio, C Juarezruiz, Nadia Mayola Velezzamora, M JimenezvillarruelAbstract:OBJECTIVE: To study the incidence of Asthenopia among computer terminal operators as compared to unexposed administrative workers and to identify the risk factors associated with this condition. MATERIAL AND METHODS: A sample of 35 computer terminal operators and 70 unexposed administrative workers from eight computing centers at an educational institution were included in the study. The risk factors studied were: lighting, contrast, type of lighting, screen type, electrostatic field, eye to monitor distance, time and number of hours worked, age, use of corrective lenses, seniority and overtime. Asthenopia was clinically identified as the presence of at least one sign and symptom present in a given workday. RESULTS: Asthenopia was found in 68.5% of the exposed group and in 47.7% of the unexposed group (p < 0.05). Among the risk factors studied, working for more than four hours at the video display terminal was shown to have a significant association with Asthenopia (p < 0.05). CONCLUSIONS: A recommendation is made to take breaks during the workday at computer terminals in order to avoid visual fatigue. Also, more extensive studies should be carried out in our population to establish safety criteria and to standardize work activities using computer terminals.
Takashi Kobatake - One of the best experts on this subject based on the ideXlab platform.
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Effective Medical Examination for VDT Workers Using a New Testing Method of Ocular Alignment
Journal of Medical Systems, 1998Co-Authors: Yohtaro Matsuoka, Yoshiko Nakamura, Takashi KobatakeAbstract:To investigate the relationship between Asthenopia of VDT workers and the ocular alignment, we measured far and near alignment of 407 subjects (74 VDT workers with Asthenopia, 137 VDT workers without Asthenopia, and 196 non-VDT workers) using Total Vision tester (VT-500). There was no relationship between the Asthenopia and the records of far alignment test. On the other hand, the incedence of exophoria and convergence insufficiency type in near alignment test was significantly high in the group of VDT workers with Asthenopia. From these results, we speculate that cases who have exophoria or show incomplete fusional response measured under the near testing distance (50 cm) tend to complain of Asthenopia.
Masaru Miyao - One of the best experts on this subject based on the ideXlab platform.
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effect of strategic accommodation training by wide stereoscopic movie presentation on myopic young people of visual acuity and Asthenopia
Displays, 2011Co-Authors: Akihiro Sugiura, Tetsuya Yamamoto, Masaru Miyao, Hiroki TakadaAbstract:The abnormal contraction of ciliary muscles due to the performance of a near visual task for several hours causes various vision problems such as Asthenopia and visual loss. However, these problems can be resolved by activating the muscles by alternately repeating negative and positive accommodation. In this study, we have verified the effect of accommodation training that uses the strategy of presenting a stereoscopic movie to myopic youth and measuring the uncorrected distant visual acuity, spherical diopter (SPH), a flicker test and subjective index of Asthenopia obtained using a visual analog scale (VAS). Stereoscopic movies are prepared by using the POWER 3D method (Olympus Visual Communications Co., Ltd.), which reduces the inconsistency between the experienced and the actual senses. Thirty-two myopic students aged 20 ± 1 years (16 males and 16 females) were chosen as the subjects. One group performed the accommodation training for 6 min, and the other group underwent a near visual task during the same period as the control group. We concluded that the accommodation training using a stereoscopic movie had temporarily improved visual acuity. This training seemed to lead to a decrease in Asthenopia.
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effect of an eyesight recovering stereoscopic movie system on visual acuity and Asthenopia
HCI International Conference, 2009Co-Authors: Akihiro Sugiura, Tetsuya Yamamoto, Hiroki Takada, Masaru MiyaoAbstract:Relaxing the contracted muscles involved in focus-adjustment around the eyeball, such as the ciliary body and extraocular muscles, is expected to improve pseudomyopia. This hypothesis has led to the development of Dr.REX--an apparatus for recovering eyesight by using a stereoscopic video. In this study, we verified the effects of this apparatus on visual acuity and Asthenopia in the short and medium terms. Thirty-two myopic Japanese students participated in this study. We compared the severity of Asthenopia in subjects who used Dr.REX and in those who performed close work on video display terminals (VDTs). We determined that the use of the apparatus improved visual acuity in both the short and medium terms. In addition, Asthenopia seemed to be less severe in subjects who used Dr.Rex than in those who performed close work on VDTs.
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HCI (13) - Effect of an Eyesight Recovering Stereoscopic Movie System on Visual Acuity and Asthenopia
Lecture Notes in Computer Science, 2009Co-Authors: Akihiro Sugiura, Tetsuya Yamamoto, Hiroki Takada, Masaru MiyaoAbstract:Relaxing the contracted muscles involved in focus-adjustment around the eyeball, such as the ciliary body and extraocular muscles, is expected to improve pseudomyopia. This hypothesis has led to the development of Dr.REX--an apparatus for recovering eyesight by using a stereoscopic video. In this study, we verified the effects of this apparatus on visual acuity and Asthenopia in the short and medium terms. Thirty-two myopic Japanese students participated in this study. We compared the severity of Asthenopia in subjects who used Dr.REX and in those who performed close work on video display terminals (VDTs). We determined that the use of the apparatus improved visual acuity in both the short and medium terms. In addition, Asthenopia seemed to be less severe in subjects who used Dr.Rex than in those who performed close work on VDTs.
