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Distance or Reading lenses??

Chivas
Expert Protege
I know the Rift is supposed to focus to infinity, but wonder which lenses would work best. I'm having cataract surgery in a few months, and I have to choose either distance or reading lenses. I'm having distance lenses put in, but would still have to use glasses for reading. Does it matter that much when using the Rift.
6 REPLIES 6

Hornet
Protege
Hi, I am ophthalmologist (performing regulary cataract surgeries). For Rift it will be best 0 zero refraction (= distance ). With this refraction (0 diopters) you can see well to distance, but near is approx only 10% of norm. Rift works as distance vision.

Usually we are correcting the calculation of intraocular lenses for -0,5 diopters (little bit blurry to distance, but little bit better for near). For good near vision is needed -2,5 to -3,0 D refraction (the it is as myopia), for good PC vision -1,5 D (screen) then distance vision without glasses is bad.
And better to choose lens without risk of glistening (google it). Really good monofocal aspheric lenses are Envista MX60 lenses (good material). We are using too asymetric multifocals (Lentis M plus) but they are not registered in States. With such lens it is possible to see not only one distance but both or three (intermediate). Some dysphotopsias are there, but nothing problematic, for Rift eventually too not so bad...Where are you from?

sdplayer
Expert Protege
A few years ago I had to buy some reading glasses for a sight condition (my right eye see's into the distance perfectly but anything up-close is completely blurred while my left eye is the exact opposite).

I was concerned about the effect these glasses would have on FOV while using the Rift but they have an additional quality I wasn't expecting! They not only make text in books clearer, they make it larger. This could mean that any disadvantage in using these glasses inside the Rift (having to push the screens further from my eyes) might be balanced by my glasses magnifying the Rift lenses, resulting in an FOV similar as if I were viewing the Rift with naked eyes!

What I'm trying to say is, if you buy glasses to wear with the Rift, make sure they not only clarify the image but also make it bigger!

Chivas
Expert Protege
"Hornet" wrote:
Hi, I am ophthalmologist (performing regulary cataract surgeries). For Rift it will be best 0 zero refraction (= distance ). With this refraction (0 diopters) you can see well to distance, but near is approx only 10% of norm. Rift works as distance vision.

Usually we are correcting the calculation of intraocular lenses for -0,5 diopters (little bit blurry to distance, but little bit better for near). For good near vision is needed -2,5 to -3,0 D refraction (the it is as myopia), for good PC vision -1,5 D (screen) then distance vision without glasses is bad.
And better to choose lens without risk of glistening (google it). Really good monofocal aspheric lenses are Envista MX60 lenses (good material). We are using too asymetric multifocals (Lentis M plus) but they are not registered in States. With such lens it is possible to see not only one distance but both or three (intermediate). Some dysphotopsias are there, but nothing problematic, for Rift eventually too not so bad...Where are you from?


Hi Hornet...thanks for the reply... I live in Canada..... My left eye has an astigmatism, so I've chosen a Toric lens with long distance capabilities which could help me see were the h#ll my golf ball went, but I wasn't sure how well that would work with the Rift. Your info made me feel a little better about my choice. I will have to do some research on this zero refraction/0 diopters so that I understand, and my surgeon understands what I want. There are other lenses that are good for distance and close vision, but they aren't yet supported by the Canadian medical system. I will have to pay a little more for the astigma lenses as is.

I'm short sighted and wear glasses when I've had enough of the contacts.
I've found that for me, an older pair of distance glasses are more comfortable in the DK2 (i.e. less distancey than my current prescription) as they allow my eyes to relax more on distance focusing that the Rift allows. I have a feeling they also help preserve my distance vision more than if I use my current stronger lenses.

In any event it may be a good idea to alternate from time to time... I don't think it's good to look at a fixed distance for extended periods of time, especially for older people like me who need to keep those lens muscles exercised.

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Link removed from above thread, it's the second 7 or 8 year old thread resurrected in order to advertise your eye clinic, we don't really want to encourage that, sorry.

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@Milacron wrote:
Since the Rift is designed to focus at infinity, having distance lenses should generally work well for most users.

Only the original 2013 Rift DK1 developer kit focuses to infinity. The next 8 headsets Meta made all focus to around 1.5m and distance lenses would be a bad idea.

 

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