21 research outputs found
Amber filter with self-administered near vision screening card / Saiful Azlan Rosli … [et al.]
No full textVisibility is defined as the greatest distance at which an object can be seen and recognized in either daylight or at night when the general illumination is increased to a daylight level. Visibility can be influenced by several factors, which include colour and contrast. Previous studies, which investigates the effects of colour combinations to level of visibility and visual performance on road signs, found that there is a significant difference in the level of visibility with different colour combinations (p< 0.05). It is clearly understood that in our nature environment and work tasks, each factors described above are variable, which in turn varies the level of visibility. Based on the supportive evidence from previous studies, visual aid such as amber lens can be used as an application to improve the level of visibility of a person in his/her daily work tasks. The amber filters with the near vision screening card can improve people’s eyesight, thus generate substantial economic benefits, and can make a major contribution to Malaysian development. In addition to the filter, the card also consists a modified near vision test that can be selfadministered. This test acts as a simple do-it-yourself screening for near vision. This eventually leads to the users awareness of their own near vision problem. This is inline with the nation’s recommendations in GTP, to drive the high-income countries as well as generate the health and work performance. Previous Study: Ahmad, A., Chen, A., Zulkifli, S., & Rosli, S. A. (2013). UiTM study on road signs in Malaysia : The impact of information volume of road sign on level of visibility. International Journal of Enhanced Research in Science Technology & Engineering, 2(6), 38–41. Aladin, A. Z., Rosli, S. A., & Chen, A. (2012). Visibility Comparison of Colour Combinations Used in Road Sign Design. Universiti Teknologi MARA (UiTM). Publication in reviewed. Iranian Journal of Ophthalmology (IrJO). Rudin, A. M. A., Saliman, N. H., Rosli, S. A., & Ahmad, A. (2011). Enhancement of contrast sensitivity by wearing amber tinted lens between youth hockey player and non-hockey player. 2011 IEEE Colloquium on Humanities Science and Engineering, 902–906. doi:10.1109/CHUSER.2011.6163868
Full- field Electroretinogram (ffERG) on color vision deficiency/ Saiful Azlan Rosli and Hamizah Ismail
No full textThis study aimed to describe the electrophysiological respond of amplitude and latency time using full-field ERG (FfERG) among colour vision deficiency. Twelve eyes of colour vision deficiency subject were recruited in this study which the mean age of the subjects was 22.0 ± 1.41 years.
Psychophysics colour vision test was done by using Nagel Anomaloscope. Room illumination was photopic adapted for 10 minutes, then single flashes of 3 cd.s.m-2 presented until four similar artefacts-free ERG waveforms, which based on ISCEV 2015 protocol. All the data were analysed using a one-sample t-test, which was compared to the normative test value. Cone a-wave amplitude (V) was statistically significant higher by 31.65, 95% CI [21.74, 41.55], p=0.00 than a normal cone a-wave amplitude of -30.73 V. Meanwhile, cone a-wave latency time (ms) shows statistically significant higher by 0.92, 95% CI [0.05, 1.79], p=0.04 than a normal cone a wave latency time of 14.30 ms. Also, cone b-wave amplitude (V) shows a significant lower by -107. 95% CI [-136.94, -77.63], p=0.00 than a normal cone b-wave amplitude of 119.26 V. FfERG techniques ability to
detect any abnormality that occurred in the retina and visual pathway related to vision
Investigations on the comparison between electronic and non-electronic near work on symptomatic health concerns and ocular changes / Saiful Azlan Rosli
No full textBackground: Over the years, technology has revolutionised our world and impacted our lifestyles. Extended technology exposure has been linked to both physical and mental health concerns. Extant literature on electronic health risks has primarily focused on office workers or schoolchildren. Although young people commonly use electronic devices, there is a dearth of information regarding daily usage patterns between the weekends and weekdays. Yet, very little attention has been paid to its effects on visual functions and changes in ocular structure in young adults. This thesis intends to compare the near work-related symptomatic health concerns, visual function, and micro-ocular structure changes between electronic and non-electronic near work among young adults. Methods: This study adhered to the Declaration of Helsinki. Three main research questions were examined using a survey and 2 experimental studies. The crosssectional quantitative method approach was employed. The survey studied weekend-weekday electronic related activities profile in young adults. Seven questions were used to inspect lifestyles regarding indoor-outdoor activities and near-work usage patterns. The symptomatology enquiry consisted of questions on general ocular, visual, ocular surface, and body sensation. The first experimental study inspected the effect of electronic near-work on visual function. The accommodation accuracy (accommodation lag) and accommodation stability (accommodation microfluctuations) were compared before and after the electronic and non-electronic near-work task using infrared open field binocular autorefractor Grand Seiko. The 2D Colour Analyser measured the luminance of near task and room illumination and illuminance spectrophotometer, respectively. The second experimental study focused on the microstructural changes after 20-minutes of the near task. Changes in the microstructure in choroidal thickness were assessed by 3D optical coherence tomography (OCT). The microstructural changes were observed between the baseline and after electronic and nonelectronic tasks. Results: Lifestyle and Symptomatology Survey: The analysis was performed on 220 respondents (age range=20.3±2.9 years old). Overall, young adults reported a preference for spending most of their hours each day on electronic near work than non-electronic near work. Young adults were found to have spent more time with electronics on the weekends than on the weekdays. The symptomatology patterns comprised 45% body, 43% ocular surface, 38% general ocular, and 32% visual sensation. Lower back pain (70%) was found to be the highest reported symptom, followed by shoulder (68%), and upper back/neck pain/tired eye (67% each). Vision Function Experiment: There was no significant change in the accommodation lag after 20 minutes near work on electronic and non-electronic. Similarly, there was no significant change in the accommodation microfluctuations after 20 minutes near work on electronic and non-electronic. Microstructure Experiment: There was a significant thinning of choroidal thickness after 20-min reading. Approximately 31.17 μm choroidal thinning after electronic and 28.00 μm choroidal thinning was observed after non-electronic reading. Although the microstructural change in choroidal thickness was noted to be slightly higher for the electronic than the non-electronic reading, but not statistically significant. Conclusion: This thesis provides more insight into the visual adaptation behaviour in dealing with vision stress between electronic and non-electronic near-work. The lifestyle of young adults inclined towards the indoor trend, pre-eminent electronic engagement with notable reported health symptoms. The baffling predisposition lingered over the weekends. The robust accommodation system responding to electronic and non-electronic near work was expected because young people are shielded with sufficient accommodation, so they automatically accommodate to keep things clear. This might imply an efficient readjustment mechanism of the accommodation system in young adults. However, this efficacy was not translated into micro-ocular structures reaction. Choroidal thinning was more evident in electronics than non-electronic near work. This unique discovery stipulates further investigation. Future studies on the longitudinal effects of excessive electronic exposure might warrant the added value of understanding electronic vision stress
Teaching & learning visual aids: power point and visibility / Chen Ai Hong, Saiful Azlan Rosli and Cosette Yoon Wey Hoe
No full textBackground: Visual aids play an imperative role in lecture delivery today. Visual aids enhance audience engagement and learning experience. The purpose of this study is to provide a better understanding of the illumination setting for Microsoft Office PowerPoint 2011 and its impact on learner's visibility at six-meter viewing distance during a lecture. Methods: The background illumination for Microsoft Office PowerPoint 2011 pre-set at one-quarter (25%), half (50%), three-quarters (75%), and full (100%) transparency levels in the visibility investigation. Visibility was inferred from the reading speed measurement to complete a text projected at six meters. Results: Visibility was affected significantly by different background illumination settings (p<0.05). The best visibility was found in a three-quarters transparency setting. Conclusions: Academicians should be more cautious about their PowerPoint text-background contrast in lecture preparation and delivery to enhance the learning environment
Comparison of visibility threshold on different chromatic contrast objects / Saiful Azlan Rosli … [et al.]
No full textThe aim of this study was to compare the visibility threshold of eight plates with different chromatic contrast. The staircasepsychophysics method based on the resolution of gaps in Landolt C was used to determine the average visibility threshold. Thirty young adults with best-corrected visual acuity of 6/6, normal colour perception and no history of ocular diseases were recruited. The results showed a combination of white on blue background plate gave a highest visibility level (mean=44.48±6.37m), while red on a blue background was the least visible combination (mean=33.30±4.68m). In conclusion, the chromatic contrast of an object can affect the visibility threshold
Reduced Monocular Accommodation Abilities with Laptop Usage Under Scotopic Ambient Illumination
No full textLaptops are widely used even in dark scotopic rooms. This study compares monocular accommodation statuses with laptop usage under three illuminations. Thirty university students read on a laptop for 5 minutes under scotopic, mesopic, and photopic conditions. The monocular amplitude of accommodation, accommodation facility, and accommodation error are measured for each illumination. Repeated measure ANOVA shows a significant difference in the amplitude, facility, and error between different illuminations [F (1.49, 43.18) = 10.61, p<0.001], [F (1.65, 36.30) = 6.78, p=0.005] and [F (2, 56) = 3.65, p=0.032]. Scotopic illumination reduces monocular accommodation abilities with laptop usage
Comparison of Accommodation Microfluctuations before and after 5 Minutes Near Digital Reading in the dark with Night Shift Mode
No full textThis study aims to compare the accommodation microfluctuation before and after 5 mins of digital reading in the dark with night shift mode. Nineteen subjects were recruited using convenient sampling and a crossover design was used to compare the accommodation microfluctuations two viewing conditions. There was no significant difference in accommodation microfluctuations before and after 5-minute reading with night shift mode and without night shift mode. The insignificant findings in the accommodation microfluctuation comparison seemed to suggest that Night Shift Mode did not display as an advantage in controlling accommodation.
Keywords: Digital eye strain, accommodation microfluctuations, digital reading, night shift mode.
eISSN: 2398-4287© 2020. The Authors. Published for AMER ABRA cE-Bsby e-International Publishing House, Ltd., UK. This is an open access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia.
DOI: https://doi.org/10.21834/ebpj.v5iSI3.256
Visual Interference from Street Lights: Field of Driver's View Analysis
No full textThe study aimed to perform field of human’s view analysis to predict the visual interference of drivers from street lights positioning. A concentric circle with 13 quadrants was superimposed onto a photograph taken at the reference point for the field of human's view analysis. Visual interference from  light source located close to fovea would be most disturbing and gradually reduced to the peripheral. From the field of driver's view analysis superimposed with real-scenario photos, none of the street light sources was found to fall within the fovea ring. The visual interference from street lights was negligible from the driver's view.
 Keywords: Visual interference; streetlight; visual field; field of view.
eISSN: 2398-4287© 2020. The Authors. Published for AMER ABRA cE-Bsby e-International Publishing House, Ltd., UK. This is an open access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia.
DOI: https://doi.org/10.21834/ebpj.v5iSI3.258
