I am just getting started in officiating and have the same questions/concerns as I wear glasses. I think for now I will use my everyday glasses. I have purchased a pair of very cheap sunglasses from Zenni Optical (
Zenni Optical - Complete prescription eyeglasses from $8.00), let me reiterate that they are very cheap but fit and work just fine (the prescription is spot on). They also have goggles that seem to look OK and are reasonable priced at $40.
http://www.zennioptical.com/cart/home.php?cat=27