Abstract:

BACKGROUND: Because of individual differences in the natural iris color and colorimetric method, colorimetric environment and the operator, color Selection results often do not make a patient satisfaction. 
OBJECTIVE: To evaluate the reliability and reasonability of iris color matching by using the digital camera.
METHODS: The irises from 148 volunteers aged between 24 to 49 years were recorded by a digital camera in studio environment (D65 standard illuminant). Photographs were taken under a set exposure parameters (AE f/2.8, l/45 s, ISO 100) and saved in RAW image file format. The characteristics of color of the tested iris were visually observed, and the color values were obtained from the digital images using Camera RAW for Adobe Photoshop 7.0. Through partial color picking analysis by Photoshop 7.0 to exhibit different levels and the H, S and B value which compared by using HSB Model sliders. All data were analyzed in descriptive statistics and compared in χ² analysis using SPSS 13.0 software package. 
RESULTS AND CONCLUSION: 148 patients for lack of a single eye with little chromatism that was not easily detected by naked eyes were randomly selected and HSB model was applied for color matching, of these, 141 enjoyed good color quality which is consistent with that of healthy eye; 4 were slightly different from other iris in terms of their color quality and restoration which can be identified when being looked at closely:3 are substantially different from neighboring iris. Based on the Munsell H.V.C. color system, by application of HSB model and digital cameras computers and certain software, to test and analyze different colors is a scientific and quantitative method which matches color quickly and conveniently. Also, the materials needed are easily acquired. Therefore, it is of clinical application value.