Comparing the visibility of low-contrast color Landolt-Cs: Effect of aging human lens

Suzuki, Takaaki; Yi, Qiang; Sakuragawa, Satoshi; Tamura, Hisae; Okajima, Katsunori

doi:10.1002/col.20071

Cited by 8 publications

(23 citation statements)

References 12 publications

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“…The experiment involved 4 young and 3 elderly subjects who joined in the previous experiment (Suzuki et al, 2005). We confirmed that all subjects had normal color vision using the Tokyo Medical College Color Vision Test (Murakami Color Res.…”

Section: Subjectsmentioning

confidence: 80%

“…The stimuli and test procedures were exactly as described in the previous experiment (Suzuki et al, 2005).…”

Section: Methodsmentioning

confidence: 99%

“…In our previous studies (Suzuki et al, 2003(Suzuki et al, , 2005, we examined whether young subjects can evaluate the visibility of visual stimuli in elderly subjects by wearing optical filters that simulate the spectral transmittance of an elderly yellowish lens (Okajima et al, 2000;Okajima and Takase, 2002). We conducted an experiment to measure reaction time (RT, the time interval from the presenting of the stimulus to the pressing of a push-button), using color Landolt-Cs on a CRT display as the stimulus, presented to young and elderly subjects, and to the same young subjects wearing glasses with the filters to simulate an aging human lens.…”

Section: Introductionmentioning

confidence: 99%

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Age-related Changes of Reaction Time and p300 for Low-contrast Color Stimuli: Effects of Yellowing of the Aging Human Lens

Suzuki

Sakuragawa

et al. 2006

J Physiol Anthropol

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We measured reaction time (RT), P300, and subjective evaluation for color Landolt-Cs with a gray color background presented on a CRT display. Seven young and 7 elderly subjects (mean ages: 21.6 and 68.4 years, respectively) participated, and the young subjects wore glasses with filters simulating spectral transmittance of an aging human lens as a test condition. The results for young subjects not wearing the filters showed that RT and P300 latency are constant among different test colors. In contrast, the results for elderly subjects showed that RT and P300 varied substantially depending upon the test colors and RT and P300 latency became longer than those of young subjects, particularly for gray and blue stimuli. In addition, the results for the young subjects with filters showed tendencies similar to those in elderly subjects. These results indicate that the yellowing of the human lens strongly influences reaction time and cognition time for color targets, suggesting that wearing the filters enables the young to simulate RT qualitatively as well as visibility of the elderly because both the simulated filter and the aging human lens modify the effective luminance, effective luminance contrast and effective color difference between the color target and the background on the retina. We also found that the reciprocal of RT and P300 latency could be expressed in a multiple regression model consisting of effective luminance, effective luminance contrast, effective color difference and age. Absolute values of RT and P300 latency in young subjects with filters, however, did not quantitatively coincide with those of the elderly subjects. There were differences of RT and P300 latency between the young with filters and the elderly, indicating that higher order age-related delay could be involved.

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Section: Subjectsmentioning

confidence: 80%

“…The stimuli and test procedures were exactly as described in the previous experiment (Suzuki et al, 2005).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Age-related Changes of Reaction Time and p300 for Low-contrast Color Stimuli: Effects of Yellowing of the Aging Human Lens

Suzuki

Sakuragawa

et al. 2006

J Physiol Anthropol

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“…The results suggested that the yellowing of a human lens affects the color vision of the elderly, and a yellow filter worn by young subjects could simulate the visibility of the elderly [10]. Aging decreases the visibility of color targets [10] as well as the ability of chromatic discrimination compared to young subjects [15]. Despite the extensive research on the relationship between aging and the changes in the lens, most studies focused on the changes themselves, not on the influence of that change to the elderly.…”

Section: Introductionmentioning

confidence: 98%

“…Among the many characteristics of an aging eye, one of the most significant changes is the distorted color appearance in the range of blue and purple [1][2][3][4][5][6]. Although the ocular system, retina, optic nerve, and brain stage also affect the aging of the eyes to some degree [7][8][9][10][11], many studies that have examined the relationship between aging and color vision reported that the lens is the major element known to affect aging [2,4]. Increasing the optical density of a crystalline lens causes changes in light transmittance through the eyes, and as the lens yellows with age, it absorbs a larger amount of short wavelength light in the visible spectrum between 450-470 nm [2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Computer Simulation for Gradual Yellowing of Aged Lens and Its Application for Test Devices

Kim

Han

Park

2013

Journal of the Optical Society of Korea

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This paper proposes a simulation algorithm to assess the gradual yellowing vision of the elderly, which refers to the predominance of yellowness in their vision due to aging of the ocular optic media. This algorithm employed the spectral transmittance property of a yellow filter to represent the color appearance perceived by elderly people with yellow vision, and modeled the changes in the color space through a spectrum change in light using the yellow filter effect. The spectral reflectivity data of 1269 Munsell matte color chips were used as reference data. Under the standard conditions of a D65 illuminant and a 10° observer of 1964 CIE, the spectrum of the 1269 Munsell colors were processed through the yellow filter effect to simulate yellow vision. Various degrees of yellow vision were modeled according to the transmittance percentage of the yellow filter. The color differences before and after the yellow filter effect were calculated using the DE2000 formula, and the color pairs were selected based on the color difference function. These color pairs are distinguishable through normal vision, but the color difference diminishes as the degree of yellow vision increases. Assuming 80% of yellow vision effect, 17 color pairs out of (1269x1268)/2 pairs were selected, and for the 90% of yellow vision effect, only 3 color pairs were selected. The result of this study can be utilized for the diagnosis system of gradual yellow vision, making various types of test charts with selected color pairs.

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Chromatic interior environments for the elderly: A literature review

Delcampo‐Carda

Barchino

Serrá

2019

Color Research & Application

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The impact of the physical environment on individuals has arisen as a growing body of research in population wellbeing. Yet, most of studies in this area do not focus on elderly even though they are particularly susceptible to the characteristics of their interior spaces. It is a well‐known fact that to be old is to acquire a tolerance of disabilities based on the gradual degeneration. A common problem is a dysfunction in visual sensitivity and accordingly, the alteration of their environmental color perception. That is why these impairments need to be understood in order to minimize the elderly spatial difficulties. To know at what point there is a loss in the ability to perceive color is necessary to understand how should we take these facts into consideration. A state‐of‐the‐art literature review of current studies from the last 20 years is carried out. The aim is to analyze existing practices on Evidence‐Based Research through a multidisciplinary approach in order to create knowledge about chromatic built environments for the elderly. Data are identified and considered together with empirical experience about color, perception, built environment and elderly. Thus, the way in which elderly perceive the space is explored. The adjustments in the formulation of these impairments throughout any design strategy to adapt the environment to their physiological changes are determined. This article aims to determine a design interpretation of the various findings, demonstrating that color, as a parameter of the visual performance, influences visual comfort and helps performance in architecture for old people.

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Comparing the visibility of low-contrast color Landolt-Cs: Effect of aging human lens

Abstract: We measured response time, the number of nonresponses, response error, and subjective visibility evaluation for color Landolt-Cs with a gray color background presented on a CRT display to young and old adults (mean ages: 22.3 and 65.9 years, respectively)

Cited by 8 publications

References 12 publications

Age-related Changes of Reaction Time and p300 for Low-contrast Color Stimuli: Effects of Yellowing of the Aging Human Lens

Age-related Changes of Reaction Time and p300 for Low-contrast Color Stimuli: Effects of Yellowing of the Aging Human Lens

Computer Simulation for Gradual Yellowing of Aged Lens and Its Application for Test Devices

Chromatic interior environments for the elderly: A literature review

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