Effect Of Five Different Light Sources On Lanthony Desaturated D-15.

In order to predict the effects of various light sources on an individual's perception of color, the Lanthony Desaturated D-15 color vision test was administered to optometry students with normal color vision and no ocular pathologies under five illumination sources. The sources of illumination include illuminant C (as a control), an incandescent lamp, a sodium vapor lamp, a metal halide lamp, and a fluorescent bulb. All of the illumination sources were calibrated to 28 foot-candles. The data collected was used to determine the Color Confusion Index for each subject. The Color Confusion Index (CCI) data was then analyzed using the Analysis of Variance (ANOVA) test. Finally, Mauchly's Test of Sphericity was used to compare the variance within the light sources. Mauchly's Test of Sphericity showed a significant variance for each of the light sources showing that equal variance between the light sources cannot be assumed. The . Huynh-Felydt correction did not reveal a statistically significant difference between the light sources while using the S-index per subject. Using pairwise comparisons there was a statistically significant difference found with 1) the mean CCI sodium vapor score 2) the ACCCI sodium vapor score 3) the C-Index sodium vapor score and 4) the mean number of errors per subject with the sodium vapor light when compared to all other light sources. There also was a statistical difference when comparing the S-index sodium vapor score with the illuminant C and fluorescent scores. This study has shown how a change in lighting conditions can affect a person's ability to discriminate colors. This can show importance because it can affect how a person may perform color discriminating tasks at work, home or elsewhere.