Role of new SNU computerized color test and OCT in diabetic macular oedema

Abstract

Abstract: : Purpose: To evaluate the effectiveness of SNU computerized color test (SCCT) for detection of clinically significant macular edema (CSME) before significant visual loss and to assess the correlation between color tests and macular thickness measured with optical coherent tomography (OCT) in patients with type II diabetes. Methods: All subjects underwent best corrected Snellen visual acuity and those with 20/40 or worse were excluded. One hundred and sixty eyes of 80 patients with type II diabetes were included. The SCCT as a pseudoisochromatic test composed of total 80 plates that have four cross, round, triangle and blank pictures and, computer and LCD monitor was used. SCCT and Farnsworth–Munsell 100 hue test were performed to detect the deterioration of color function. Macular thickness was measured with slit lamp biomicroscope, fundus photography, and OCT (OCT3, Zeiss) Results: Patients with CSME had significantly worse tritan color score despite normal visual acuity. A significant correlation was found between the tritan value of the SCCT and macular thickness which was measured with OCT. (pearson correlation, r=0.48;p<0.001). This correlation was not found using the tritan value of Farnsworth–Munsell 100 hue test(r=0.27:p<0.05). Another method to measure macular thickness did not show any correlation with color tests, either. Conclusions: The results suggest that the SCCT as a pseudoisochromatic plate test can be an effective tool for early detection of CSME in patient with type II diabetes.

Keywords: diabetic retinopathy • macula/fovea • color vision