| Popis: |
Approximately ten percent of males in the United States and one half of one percent of females have a congenital red-green color vision defect. Detection of this defect early in life is important because school children with color vision defects can be as much as one year behind in learning ability when compared to their color-normal peers.2 Although the pseudoisochromatic plate tests (e.g. the Ishihara test) are quite sensitive when administered properly, many vision testers administer them under improper lighting conditions, leading to somewhat less reliable results. In addition, pseudoisochromatic plate tests are subject to fading from exposure to light and from repeated handling. We have evaluated two color vision screening tests which are suitable for use in large scale screening programs. |
