I'm a 43 yr old who is addicted to tennis. On a bright sunny day, I can see\nthe ball clearly from the other end of the court all the way to my end of\nthe court. Yet, when the skies are overcast, I don't see the ball clearly\nacross its entire path. Depending on the background, I may lose it for\nfractions of time. I may lose it in the other players white shirt, in the\nwhite lines on the court, or in the white tape across the top of the net.\n\nI also have difficult seeing the ball when the background is a parking lot\nfull of cars and the resulting reflections of the sun that come off the\ncars. And I have some difficulties seeing it while playing indoors under\nartificial lighting.\n\nI generally still hit the ball under these conditions, but I'm much more\ndefensive. I've been to the eye doctor and he says that my eyes are\nhealthy. I have an updated set of contact lens (rigid gas permeable) that\ngives me sharp focus, but it appears that it is a 'contrast sensitivity'\nissue. There is some degrees of color blindness in my family. I've passed\nthe simple color blindness tests at the eye doctors, but have noted that\nsome of the colored images don't 'pop out' to me where they do to my eye\ndoctor.\n\nAny thoughts or suggestions would be appreciated.