There is nothing worse than paying $1000 for a new PC, $800 for a VR headset and then having to cram your glasses into an HTC Vive or Oculus Rift and not really be able to see anything. Luckily VR Lens Lab created a way for people who wear glasses to send in their prescription and receive the inserts which fit snugly into the headsets. You do need to know your prescription but you do not need a doctor's rx to send to the company. Works very well as intended and I did not notice any distortion on my prescription. Everything crystal clear. I did opt for the blueguard coating. I figured if one is going to spend this much $$$ on VR, you might as well get the best results. The only sad thing is when the new versions of these headsets come out these old inserts will be useless.