Before revision: Mean-modulated flicker -- wherein luminance increments and decrements of equal magnitude are applied, over time, to a test field -- is commonly used in both clinical assessment of vision and experimental studies of visual systems.
After revision: Achromatic, mean-modulated flicker ( wherein luminance increments and decrements of equal magnitude are applied, over time, to a test field -- is commonly used in both clinical assessment of vision and experimental studies of visual systems.