We're with Swiss Medical and both had recent eye test which were free and included in the plan, so we went in search of glasses.
Adri needed one pair for reading/PC work and one pair for driving. I needed a new pair for driving and to replace the lenses in my sunglasses to the correct spec for my eyes.
She ended up with the driving glasses at no cost and the reading pair with extra to pay. I paid extra for my driving glasses and a little more for the lenses for my existing sunglasses. The reason we paid extra is that the free ones are very basic and cheap.
The total cost for everything was about $28,000 with discounts, but we paid in three interest free instalments. If we hadn't had a health plan, the bill would have been around $60,000 apparently. Some health plans are even more generous, so it all depends who you are with.
I just wish i could squeeze more out of them, but I certainly don't wan to be ill just to that!