The visual performance of human subjects has been investigated during presentation of a digital display moving at constant velocity with regard to the stationary eye. The display was presented for brief periods (10-80 ms) at different luminance levels (0.5-8 cd/m2), contrast levels (1-16), and display sizes (character height 12-24' of arc). The probability of correctly identifying the display decreased to 90% when the velocity reached 3-4 degrees/s. Performance was improved by increasing digit size, decreasing exposure time, or increasing display luminance. Theoretical arguments have been adduced to indicate the usefulness of the results in predicting performance during continuous display exposure.