I just finished trying out a set of prescription lens inserts from WIDMOvr, which apparently is the preferred provider for HTC. (If you order from the HTC website, you end up on a WIDMOvr page.) I am near sighted with a touch of astygmatism. I wear progressive lenses, which work with the Vive, but they are not ideal--you have to keep focused on the 'sweet spot.'
I was nervous about the purchase, I can imagine any number of things that might go wrong. But I would assess the lenses from WIDMOvr at 5 stars, plus. They are remarkably easy to install and uninstall, which is important if others will use the headset. More importantly, the visual experience is perfect--no more searching for the sweet spot, and no more clunkiness with eyeglasses. The price is fair if you compare the cost of eyeglasses--the WIDMO lenses are less.
Going forward, I will always consider corrective lenses part of the cost of purchasing a headset. And WIDMO clearly has a strong product.