My 7 yo ds started wearing glasses a few months ago. He is now tall enough to meet the requirement for all the rides and is very excited about trying out some of the coasters. What is the best way to keep his glasses on? I visited two eye stores in the mall (Pearle and Lenscrafter) and neither carried any sort of strap (only a holder which is meant to be worn around the neck). Any recommendations on what I should buy and where?