Abstract
Abstract: :
Purpose:To evaluate the screening efficiency of the new web–based City University Dynamic Color Vision Test using sensitivity and specificity measures. Methods:Thirty individuals(10 males, 20 females) with normal color vision and thirty individuals (26 males, 4 females) with congenital Red–Green color deficiency participated in the study. All had a best corrected visual acuity of 20/40 or better. The subjects performed a battery of color tests including the Nagel Anomaloscope, FM100–hue test, the AO–HRR(4th ed),the Ishihara and the new City University Dynamic Color Vision Test(CUDCVT). The tests were done monocularly with the illumination provided by the Macbeth Easel lamp. The color deficients were classified based on their response on the Nagel Anomaloscope. The pass/fail criteria was determined for all the tests. For the CUDCVT, reporting the disappearance of the ‘color square’ occurring anytime during the test was considered a ‘fail’. The coefficient of agreement(Κ) was also calculated between the new test and the other tests. Results: Based upon the results with the Nagel, the new test had 100% specificity which means all the color normals passed the test. Of the 30 color defectives, 2 passed the new color test resulting in a sensitivity of 93.33%. The coefficient of agreement(Κ) for the Nagel and CUDCVT was 0.93. For the Ishihara, the specificity was 100%, sensitivity was 96% and Κ was 0.96. Similarly for the AO–HRR (4th ed) the specificity was 100%, the sensitivity was 80% and the Κ was 0.76, for the FM–100 Hue the specificity was found to be 100%, sensitivity was 93% and Κ was 0.93. Conclusions:The results of the study indicate that the City University Dynamic Color Vision test is a valid screening test for red–green color deficients with a high coefficient of agreement with standard Nagel Anomaloscope results .