I also use a Cateye, and agree that the small numbers along the bottom might as well be invisible.
My solution cost me
$15.
This site:
http://www.readingglassesshopper.com...d-goggles.html sells sporty glasses with a clear (i.e. non-prescription) lens, and a bifocal insert.
I can now read the Cateye and cue sheet with no problem, and I look just as "cool" as the guys with the $300 prescription Oakleys.
Picture: