If you are looking for Valve Index lens protector, consider printing out this model instead: https://www.thingiverse.com/thing:3733220
Prescription lens adaptor for Valve Index. It's designed to take standard single vision lenses for cheap but big Zenni #232921 frame to match with wider field of view. It's been tested with 1.57 mid index lens. Antireflective coating highly recommended to help with glare.
Total price: Lenses ($13) + AR coating ($5) + 3D print ($10 - $20) = $28 - $38
There are two models to choose from: standard or thin:
- Standard has extra spacing and accommodates thicker lenses. Choose this one if you don't mind losing a little bit of FOV.
- Thin is ~2mm thinner. Note that Index and Zenni lenses may come into contact if your prescription is too strong.
- Super thin brings the lenses as close as possible. Try this if you want to experiment with maximizing FOV.
When you order your lenses, set the IPD to 67mm so the optical center will be aligned with the headset's lenses. This is not super critical but it can help with minimizing distortion.
You can then dial in your real IPD on the headset.
Originally I recommended Ninjaprototype for print fulfillment, but seems like they take around 3 weeks to arrive. You can try using Treatstock (one of the option when you click "Order This Printed" above), which offers selection of manufacturers in US.
Update: I've created the model to be printable with FDM printers at home, turns out the model's walls are too thin for Shapeways to print with their process. You should try ordering through Treatstock or Nijnjaprototype since they print using FDM.
The model should be facing up (i.e. the side that connects to the Index side down) on the print bed to minimize overhang. You may need support, especially for the thin model. Tested with PLA, though other materials should also work fine.
Using the adaptor
Pop out the lenses from your Zenni frames (see this video: https://youtu.be/rB6568bjAlw?t=39). It might take a bit of force, but if you have clean hands they shouldn't get scratched.
Then align each lens from the top of the adaptor, and they should be curving inwards. Then snap them into place. They should have good holding force, but let me know in the comments if they don't hold well for you.
Finally, make sure you clean all the lenses before final assembly.
- The lenses are now angled out slightly. This should contour around the fave better and gives more room for the brow.
- Added super thin option if you want to experiment with largest FOV possible.
- Added thinner model of the adaptor.
- Reduce adaptor height and general improvements to make the adaptor fit better.