Korean J Ophthalmol.  2005 Jun;19(2):145-148. 10.3341/kjo.2005.19.2.145.

Shift of Colorimetric Values in Ishihara Pseudoisochromatic Plates with Plate Aging

• Hyon JY
• Lee JH
• Wee WR

• KMID: 754414
• DOI: http://doi.org/10.3341/kjo.2005.19.2.145

Abstract

PURPOSE
This study aimed to quantify the shift of colorimetric values in the Ishihara pseudoisochromatic test with aging of the plates. METHODS: Three sets of Ishihara pseudoisochromatic plates with different published dates (printed in 1971, 1983 and 2001) were tested. Positions matching 32 dots with 13 colors were chosen from each set and the colorimetric values with the CIELAB and HSB/HLS color systems were measured with a spectrophotometer. Lightness (L*), red-green (a*), blue-yellow (b*), chroma, red hue, yellow hue, and green hue values from each set were compared. RESULTS: L* and chroma values were significantly higher in the older versions. The a* values shifted to red (increased a*) and the b* values shifted to yellow (increased b*) with plate aging. CONCLUSIONS: Our results showed that the pseudoisochromatic plates had significant changes in color values and a directional shift with aging.

Keyword

CIELab color model; Colorimetric values; Color vision test; Ishihara pseudoisochromatic plates; Spectrophotometer

MeSH Terms

Color
*Color Perception
Color Vision Defects/*diagnosis
*Colorimetry
Humans
Spectrophotometry
Time Factors
Vision Tests/*instrumentation

Figure

• 

  Fig. 1 Schematic diagram of the CIELab color model. The central vertical axis (L*) represents lightness with values ranging from 0 (black) to 100 (white). On the a-a' axis, positive values indicate amounts of red while negative values indicate amounts of green. On the b-b' axis, yellow shows positive values and blue shows negative values. For both axes, a zero value is neutral gray.

• 

  Fig. 2 Change of colorimetric values in the Ishihara pseudoisochromatic color test with different published dates. Sets 1, 2, and 3 were published in 2001, 1983, and 1971, respectively. Color dots were much brighter (A) and more saturated (B) in the older sets. In the CIELab color model, redness was increased on the red-green axis (C) and the colors were shifted toward yellow on the blue-yellow axis (D) in the older version (set 3) of the color test plates. *Analysis of variance, p<0.05, †Analysis of covariance, p<0.05

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