Effects of polarity and luminance contrast on visual performance and VDT display quality

Wang, An-Hsiang; Chen, Ming-Te

doi:10.1016/s0169-8141(99)00040-2

Cited by 86 publications

(49 citation statements)

References 8 publications

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“…A similar finding was reported in an investigation which employed 56 colour combinations in a liquid crystal display (LCD) [11]. On another note, contrast polarity, be it black-on-white (positive polarity) or white-on-black (negative polarity), in a visual display terminal was reported to have no significant effects on visual performance [16]. In other words, the mean visual acuity was not affected by the contrast polarity.…”

Section: Figsupporting

confidence: 77%

“…A lower contrast ratio (0.5) gave poorer LogMAR scores than a higher contrast ratio (0.8). In an earlier study on the effects of contrast ratios on visual acuity, analyses of variances showed that the latter was significantly affected by the former [16]. There was a significant increment in the visual acuity at higher contrast ratios.…”

Section: Figmentioning

confidence: 81%

“…Also, the reports on polarity were inconclusive. Some claimed that negative polarity was preferred for better legibility [11], [12], while others believed that contrast polarity did not affect to visual acuity [16]. Visual acuity reduces when the contrast ratio is low [10], [17], [18].…”

Section: Introductionmentioning

confidence: 99%

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Contrast Ratios, Colour Elements, and Polarities in Visual Acuity Measurements

Chen

Muhamad

2018

IJET

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This study was aimed to investigate the effects of contrast ratios, colour elements, and polarities on visual acuity measurements. The visual acuities of 18 subjects were measured using 6 different modifications of the Landolt C chart in a 4-metre LogMAR design: ( Comparative analysis was performed to examine the effects of the three aforementioned parameters on visual acuity measurements. The visual acuities were found to be significantly different between the contrast ratios of 0.5 and 0.8, regardless of whether colour elements were present (blackon-white) or otherwise (yellow-on-green) [Friedman test:  2 (3) = 24.24, p < 0.05]. Interestingly, the LogMAR score was found to be significantly different between the yellow-on-green and black-on-yellow chart designs when the contrast ratio remained constant at 0.8 [Wilcoxon signed-rank test: z = 2.950, p < 0.05]. However, the effect of contrast polarity (positive/ negative) on visual acuity was not significant when the contrast ratio was fixed at 0.8 [Wilcoxon signed-rank test: z = 0.318, p > 0.05]. A lower contrast ratio and midrange wavelength colour reduced visual acuity. The effect of contrast polarity without colour elements on visual acuity was negligible.

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Section: Figsupporting

confidence: 77%

Section: Figmentioning

confidence: 81%

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Contrast Ratios, Colour Elements, and Polarities in Visual Acuity Measurements

Chen

Muhamad

2018

IJET

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“…Polarity and luminance contrast are two key factors that affect visual performance and display quality (Wang & Chen, 2000). Dillon (1992) defined positive image polarity as having black characters on a white background, and negative image polarity was defined as white characters on a black background.…”

Section: Effects Of Virtual Lightingmentioning

confidence: 99%

“…A great deal of the research related to the effect of image polarity on performance has been done for reading tasks using different media such as microfiche, paper, or a VDT. Depending on the viewing media, negative or positive polarity could be more effective (Wang & Chen, 2000).…”

Section: Effects Of Virtual Lightingmentioning

confidence: 99%

Effects of virtual lighting on visual performance and eye fatigue

Duffy

Chan

2002

Hum Ftrs & Erg Mfg Svc

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This study is designed to determine whether differences in eye fatigue and visual performance can be shown under varying virtual industrial lighting conditions. It is based on the results of studies of more traditional video display terminal (VDT) tasks reported in the literature. One experiment was designed to determine if the effects of virtual lighting on eye fatigue and visual performance in a simulated virtual industrial environment are similar to some other VDT tasks with varying luminance contrast. Results of a test of 20 participants in a vigilance task show that there is a significant difference in performance and eye fatigue in the virtual environment with varying virtual light conditions. These results may help designers see that performance in some virtual "lighting" conditions, for some tasks, is consistent with that in the real. However, due to the difficulties of determining the appropriate virtual objects to be considered for the luminance measures, additional research is needed to be able to generalize the results to other industrial training scenarios. A second experiment was intended to test for the luminance decrement in a VDT that was shown in recent literature. The results would have potential implications for the experiment that included a vigilance task. However, the results showed that the luminance decrement demonstrated in recent literature did not occur. These results suggest that the equipment used in the present experiments should not cause difficulty in interpreting the results of the vigilance task.

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Visual comfort as a function of lightness difference between text and background: A cross‐age study using an LCD and a tablet computer

Sun

Huang

et al. 2014

Color Research & Application

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Two experiments were performed to investigate the effects of text‐background lightness difference on visual comfort. A panel of 21 young and 20 older observers in Taiwan participated in Experiment I, using an LCD TV (with a display luminance of 551.8 cd/m2) as the presentation media. The results show that on a light background, visual comfort increases as the lightness difference gets larger and larger. On a dark background, however, the highest visual comfort value can be obtained when there is a moderate lightness difference. There seems to be little effect of age on visual comfort using the LCD TV with regard to the lightness difference. In Experiment II, 20 young and 20 older Taiwanese observers participated, using a tablet computer (with a display luminance of 397.3 cd/m2). According to the results, the larger text‐background lightness difference, the higher visual comfort value for older observers. For young observers, however, the highest visual comfort value can be obtained when there is a moderate, rather than extremely high, lightness difference. These findings can help provide useful guidelines for graphic user interface design in modern e‐reading devices. © 2014 Wiley Periodicals, Inc. Col Res Appl, 40, 125–134, 2015

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Effects of polarity and luminance contrast on visual performance and VDT display quality

Cited by 86 publications

References 8 publications

Contrast Ratios, Colour Elements, and Polarities in Visual Acuity Measurements

Contrast Ratios, Colour Elements, and Polarities in Visual Acuity Measurements

Effects of virtual lighting on visual performance and eye fatigue

Visual comfort as a function of lightness difference between text and background: A cross‐age study using an LCD and a tablet computer

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