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Oculus Rift CV1 Prescription Lens Adapter

by jegstad, published

Oculus Rift CV1 Prescription Lens Adapter by jegstad Jun 1, 2016

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Inventor Fusion 360

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16321Views 2193Downloads Found in Video Games

Summary

12/3/2016:
To make for easier remixes, this design is also available in it's native Fusion 360 format here: http://a360.co/2g4JcHj
6/28/2016:
I switched from tinkering with Autodesk Inventor to Autodesk Fusion 360 and decided to rebuild the adapter model in Fusion 360.
I've uploaded two new versions. Both have a thicker curved band that prevents the adapter from moving at all once installed in the rift. The 40mm version is for the same type of (almost) round lenses as the original, available from Zenni optical with frame #450021. The 43mm version is for the lenses available with Zenni optical frame #550021; note that the lenses from this frame are slightly more oblong than the smaller lenses, and the adapter is oblong to match, so if you have true round 43mm lenses from some other source, the fit will not be perfect.

Original:
This adapter is designed to take 40-41 mm diameter (almost) round lenses, such as the ones that come with Zenni optical frame #450021. The adapter spacing matches that frames spacing as close as I could get it. I have a medium-strong prescription and clearance between my prescription lenses and the rift lens is somewhere around 1.5 mm. I'm not sure if would be clearance issues with stronger prescriptions. This adapter is the result of a couple weeks of design and tweaking to get it working for my face, and it's also my first fully realized 3d design and 3d printing project, so I make no guarantee this adapter will work for anyone but me!

To use:
Before you remove the lenses from the original frame, make orientation marks with a sharpie or something on the edge so you know which way is up. My understanding of how lenses are ground for your specific prescription/IPD makes me think it's important to retain the lens orientation, and there are no other orientation marks on my lenses that I can see.

The lenses should fit loosely into the groove in the inner rim of the adapter, and become tighter once the adapter is fitted onto the facial interface.

There are tabs at the bottom of the adapter that should straddle the plastic rim at the bottom of the facial interface.

The top curved part should be oriented so its sitting flush against the indentation on the facial interface that gives clearance for the cord.

Once the adapter with lenses is fit in the facial interface, re-attach the assembly to the rift by pushing in the flat tab at the top, then gently fit the bottom tabs into place.

Print Settings

Printer:

Wanhao i3

Rafts:

Doesn't Matter

Supports:

Yes

Resolution:

.2mm works fine. .1 is slightly better

Infill:

20%+

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3 days ago - Modified 3 days ago

Ordered up the 43mm version from a printer in Sheboygan, WI on Monday and they were in my snail-mail box on Thursday (thanks Kirby's Hub!!). I had him make three since I thought I might need to cut & glue a couple together to compensate for pupil distance. Pulled my glasses out of the envelope from Zenni Optical an hour ago (Friday - I'd also ordered on Monday) and thought they were a bit wide, but after bending the nose pads in & slapping them on my face it seems a perfect prescription. I then took them off and lined them up to one of the prints -- spacing on the frames and the adapter print appear identical, and I anticipate not having to cram the Oculus slider adjustment to the extreme left anymore. A VERY tiny Phillips driver is req'd for loosening the frames to pop out the lenses. Now I'm looking for a d@m*ed Sharpie so I can 'index' them before removing and transferring to the adapter...will update...

OK update, like an hour later after finding my Sharpie and putting a tiny dot atop each lens. They snapped perfectly into the adapter, which snapped perfectly into the Rift's face-frame and then back onto the headset. I was concerned that there would be contact with the Oculus' lenses, but I estimate 1mm clearance on one side, and perhaps 1.5mm on the other (for MY prescription). Yay! Still have to have the slider far left for best view, but AWESOME now that I don't need my glasses upon VR entry. THANKS jegstad!!!

Comments deleted.

Thank you for sharing this! I made the 43mm version using my prescription and the IPD from the Oculus settings (i.e. 69mm), and it was perfect. After installing this I can now read text in my CV1!

One question. Zenni Optical wants to know my PD (pupillary distance). When my prescription lenses are transferred to the adapter, how much will this value change? There must be some margin of error, right?

Jan 23, 2017 - Modified Jan 23, 2017
jegstad - in reply to samsonite1

You should be ordering the glasses using your prescription ipd. The adapter lens spacing matches the zenni frame lens spacing.

My prescription didn't come with that info. I was thinking about using the adjustable IPD value of the headset for reference. From what I can measure with a ruler and piece of paper, it's almost the same. But if I'm off by 3 mm, I hope it won't affect my vision.

I used the IPD from the Oculus settings and it was fine. I think Zenni just wants to make sure the frames will fit your face, but you will throw them away anyway.

Ah, so you're saying the IPD value is not used in the manufacturing of the lenses? It's only for the frames? That seems to make sense.

IPD is used in conjunction with the frame size/spacing to determine where the lens maker puts the optical center of the lens.
http://www.zennioptical.com/blog/what-is-pd-and-why-is-it-important/
https://endmyopia.org/how-to-measure-pd-pupillary-distance/
"If you have a low myopia prescription, and no astigmatism correction, getting PD exactly right isn’t that big of a deal. Of course you don’t want to blindly guess at it, but a millimeter or two either way won’t affect your lens wear notably.
So if that’s you, you’re in the clear.
But if you have a high myopia prescription, and especially if you also have an astigmatism correction, the PD suddenly becomes pretty important. "

Jan 30, 2017 - Modified Jan 30, 2017
samsonite1 - in reply to jegstad

Technically speaking, how is the "optical center" added to the lens? Is the lens material physically and/or permanently altered or is it something to do with the film coating?

It's defined during the grinding of a prescription lens. There's plenty of references about this stuff on the internet, but I thought this reference explains it pretty well (#7 on the page):
https://books.google.com/books?id=_Z15AAAAQBAJ&lpg=PA122&ots=oeBGed7LsN&dq=prescription%20lens%20how%20its%20made%20%22optical%20center%22&pg=PA47#v=onepage&q&f=false

Jan 30, 2017 - Modified Jan 30, 2017
samsonite1 - in reply to jegstad

Ah, so the edges of the lens are grinded down to move the marked optical center to center of your eye. It does matter. A whole lot.

Cannot express how excited i am about this, great job! Definitely leaving a tip

It's been working great for me for 9 months! I broke the original one I printed, and was forced to use my glasses while I printed out a new one. It was pure torture. The Zenni lenses were much higher quality than I was expecting for $15.

I printed the newer design, and it is even better. Thanks!

Just got my lenses from Zenni and popped them in. This works great, thank you so much for creating it and sharing it with the world! So much better than glasses or contacts.

Hi there, thanks for sharing the adapter. I'm planning to use the 43 mm lens. I just did a test with it in my oculus and I notice the frame is reduzing oculus FOV. Is there a way to make the lens bigger? Maybe oval? Just a suggestion. Thanks!

You could re-model the adapter to fit whatever size/shape lens you have as long as it fits within the space constraints of the rift. Check out the makes and remixes of the adapter to see what others have done so far.

Comments deleted.

wich adapter is the best ? i got -4 dioptre . greez

Comments deleted.

the order this printed button wont work ? greez

Works for me.

now it works...thanks...

this looks awesome...i need to try it. are the 43 mm lenses the best way to go.

I'd go with the 43mm version.

I would love to see an adapter for a larger lens with a bit more FOV. I have the VR Lens Lab lenses and adapter and they have a better FOV especially on the bottom. I'm not going to complain about the free design though.

The VR lens lab lenses are distorted at the edge so even though the FOV is larger it's not all it's cracked up to be. Zenni lenses are sharp edge to edge.

Aug 2, 2016 - Modified Aug 2, 2016

I have also a question. How much is the distance between the rift lenses and the adapter lenses? So can the adapter lenses touch and scratch the oculus lenses in any case? And wich kind of lenses should i order from zenni ? There a lot of lenses, 1.65 1.67, i dont not wich one i should choose for this adapter. I now the frame, but not the details like index etc.

The lenses in the adapter should not contact the headset lenses unless you are pressing on the adapter lenses or something. Picture 3 shows the spacing between the adapter and the headset lenses. The lenses pictured are 1.57 index lenses with a medium strength prescription (-6 diopters). I don't know how much thicker a stronger prescription would make the lense, but there is a few mm of clearance with my lenses. As I understand it, higher index lenses would be thinner/flatter.

Hi there. I have a small question. In this model, What is the distance between lens(front asphere) and eyes ? The front asphere of regular eyeglasses should be 15mm far from eyes. Every mm dose the matter, especially for the high index glasses. From your picture ,It looks like this frame is 3~5mm farther than the regular glasses. Im sure that if the distance miss matched , it will miss match the asphere curve and cause the slightly blur.

Comments deleted.

Since the adapters affixes lenses to the headset, the distance of the lenses from your eyes will be a function of how the cv1 fits on your particular face. How far are the cv1 lenses from your eyes now? Take that distance and subtract 4 mm and you'll have a rough guess at how far the adapter lenses will be from your eyes.

Thanks for the replay.
The CV1 lens are fresnel lens. The light through lens is almost collimated. Only the FOV changes by the distance. It just need align the center with your pupils. But prescription lens are distance-sensitive. It is a function of each particular eye only. It should stay near that place. The higher index of glass and higher myopia the more sensitive it is.The foam is soft but the frame is still solid. Actually its still lot space . But It too hard to measure inside that space.

I send the empty frame to lens crafter .He believe it need rise the frame a little bit.Otherwise re-config the machining for this specific parameter or mount this thing on my nose for perfect matching. •(⌚_⌚)•

Any way.Thanks for the design.I think its a good time learning basic 3D modeling and remix it.

Is there any reason why you created a second design for the 43mm lenses? Is there an advantage over the 40mm? Or you just had a second frame lying around? :P

I wanted a second set of lenses to test a design I'm trying out that replaces the entire facial interface, and decided to go with the slightly larger frames.

Oh, ok. I thought it would have to do increased FOV or something with the larger lenses... but i guess when they sit that close to your eyes, it's doesn't make a huge difference. So I guess there's no reason to pick one over the other? If there isn't, then I'll go ahead with the 43mm ones then...

I have access to custom cut lenses, any recommendations to improve on the design? Or just stick with what you've experimented with?

Yeah, it doesn't make a huge difference visually. The 43 mm frames are slightly oblong shaped, so the shape does help keep the lenses oriented. Have you seen the lenses from vr lens lab? I'm not sure how much a lens that is shaped like that would help compared a round lens. The main reason I started with the round lens is because it's easy to design for.

Yeah, I don't see what the advantage that that lens shape would give over round ones... I think i'll stick to the 43mm for now. :)

PS: Strangest thing, the lenses are reversed in the VR-lens lab mounts, as in the concave part faces the Rift... which makes sense so you don't scratch the Rift lenses, but it seems initially counter-intuitive at first.

Jun 18, 2016 - Modified Jun 18, 2016

Thanks a lot man. I was working on a design as well but this is way better.

Do you recommend ABS or PLA?

Would this work for Dk2? tks!

no its specifically fitted for the CV1 only.

You're a (virtual) life saver!

Just ordered a set of lenses for these and will have to give the adaptor a try. Print it inside facing down I imagine and enable support for the top bit?

How do you pull off the part from the rift to attach this?

Done, and I must say, using a good pair of lenses is soo much better on the eyes than wearing my contacts. Love this, thanks for releasing it!

Yeah, I printed mine sliced with simplify3d with supports turned on, oriented as it's shown in the first picture.

Here's what Oculus says about removing the facial interface- https://support.oculus.com/help/oculus/1114691701909297
In practice, what I've found works best is to hold the headset in both hands, face down with the top strap towards you, and apply firm upwards pressure with both your thumbs at the same time against the plastic rim of the facial interface until the tab starts to pop out.

What interpupillary distance (IPD) is this designed for? Would it need tweaking for a different IPD?

Since the lens spacing matches the frame from Zenni, as long as youre getting your prescription/ipd for that frame, the adapter should work fine.

When you say the frame matches the IPD for the frame, what about the adjustable IPD on the Rift itself? What if the frame and the Rift IPDs don't line up?

Its exactly like wearing any glasses with the rift. You can adjust the rift ipd to match your prescription ipd, or tweak it to what looks best...

Thanks! I'm gonna try it.

Got it, works great! Thanks a ton! Couldn't be happier!

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