APPARATUS FOR ENHANCING VISUAL PERCEPTION OF SELECTED OBJECTS IN RECREATIONAL AND SPORTING ACTIVITIES

摘要

To enhance perception of a yellow tennis ball (706) while playing or watching a tennis game, the game is viewed through an optical filter mounted between the participant (704) or spectator (708) and the ball (706). The optical filter has predetermined transmittance having a pronounced peak centered substantially around 500 to 600 Nanometers that passes a high percentage of incident light reflected and fluoresced by the tennis ball (706), but passes a substantially lower percentage of light in the remaining portion of the visible spectrum.