Evaluating the Role of Colored Filters (Red, Green) in Improving Color Vision Deficiency

Abstract

Background: Color Vision Deficiency (CVD) is defined as the inability to make discriminations based on the wavelength composition of the light, independent of its intensity. This is due to the abnormalities found in the cone cells of the retina. Some professional activities become so difficult that effective tools like colored filters are needed. These filters do not treat the condition overall, but they improve the perception of color and, therefore, the quality of life for all CVD patients. Methods: This study used an observational cross-sectional study design. 500 patients were screened for Color Vision Deficiency (CVD) for two months using the Ishihara test, visiting the Eye OPD of PIMS hospital. Patients who have CVD were then subjected to red and green filters to assess any improvement in the discrimination of colors. The data were then analyzed to find out whether these filters made any improvement in colour discrimination in CVD patients. Results: From these 500 people who were examined, 30 of them (6%) had Color Vision Deficiency (CVD). From these diagnosed patients, 73.3% were males,90% were red-deficient (Protanopia/Protanomaly), and the remaining 10% were green-deficient (Deuteranopia/Deuteranomaly). Red filters were effective for all patients when subjected to the Ishihara plate tests. Whereas green filters did not show any effect on CVD. These findings show the practical use of red filters for the enhancement of color vision for those with CVD. Conclusion: Red filters enhanced the color perceptions in patients with Color Vision Deficiency (CVD), especially in red-green deficient patients. This study confirms red filters can be used as an effective management device for CVD.