S.A.
It might be easier to go through your insurance company to get referrals for doctors that they cover, then ask the moms here if they have any experience with those particular doctors. Otherwise you might find yourself with a lot of great suggestions that your insurance doesn't cover (I've had that happen a time or two!).
I know my sister went to Lenscrafters and Target Optical in Cary and Apex and liked them, but I don't have any suggestions for the Cary/Morrisville area since I live in Garner :)
Good luck... I know how frustrating it can be trying to find a good doctor (whether its an optometrist, pediatrican, gyno, or any other kind of doc) in a new area and work within the confines of your insurance... I've lived in six states and it's always a pain!