Oculus Rift and prescription lenses

I have successfully installed my prescription (moderate astigmatism) into the Rift.

It is very simple to do. Order your distance prescription only, no bifocal or varilux, and get them cut to 43mm dia. Also it's helpful if you have the optometrist cut small notches around the perimeter to help locate the horizontal/vertical orientation. So a notch at 0, 90 and 180 degrees is best, to let you know where the top and sides are. You need the top because of your pupil distance (see below).

Place the lenses inside the A cup, they will come to rest against the small tabs located inside the cup.

After orienting them carefully to make sure the axes are correct, glue them in place. I used Amazing Goop. Just four dabs per lens. Keep the glue out of the line of sight, there is plenty of room though, so this is not difficult. I used vinyl electrical tape to temporarily hold the lenses in place while checking alignment and gluing.

Also make sure when the optometrist cuts the lenses that they take measurements off the Rift, so they can account for your pupil distance, since the IPD is not mechanically adjustable (the lens mounts are a fixed horizontal distance, you need to get your pupil distance correct taking the Rift's lens distance into account).

This process works amazingly well. I now can use my Rift without glasses and get the full immersion. And it is as clear as when I wear my glasses.