Re: Computer displays that correct vision possible?On May 6, 10:15 pm, Gene S. Berkowitz <first.l...@verizon,net > wrote:
> In article <KHPTj.41565$2Y1.13...@newsfe30.ams2>,
> i...@oblivion.nothing,com says...
>
> > "n...@bid.nes" <Alien8...@gmail,com > wrote in
> >news:1ebbff3c-5d59-441e-a4a7-fcf8a6f66d35@s33g2000pri.googlegroups,com :
>
> > <Snipola>
> > >> an image on the retina.
>
> > <Snipola>
> > > I'm not entirely sure of that re: holography.
>
> > I have no experience making holograms, and as such, I don't see
> > why making a hologram "out of focus" in such a way that requires
> > a lens to view that is equal to one's prescription wouldn't work.
>
> I do,
Ah, good, someone who knows what they're talking about (as opposed
to say, me).
> and what you propose is simply impossible. There is no way
to
> produce a hologram that is "out of focus". If you see an real object at
> arms length as fuzzy, you will see a hologram of that same object as
> fuzzy also.
Well yes, but that's not quite what I meant.
> > Actually, I think if you shot the image through your glasses
> > would work.
>
> You normally don't shoot a hologram through a lens, and if you did, you
> end up with a hologram of a lens. The hologram of the lens would work
> just like the original, for other objects captured by the hologram.
I have read about holographic lenses (probably yet another subject)
but have not had the opportunity to play with any.
> So, you could make a hologram of your eyeglasses in front of a book, and
> be able to read the book through the eyeglasses. However, someone with
> better vision would simply see the image as distorted by the lens, but
> not out of focus. And, it being a holgram, they could simply change
> their viewing angle and read the book over the eyeglasses.
Now we're sneaking up on what I had in mind. Is it possible to frame
the hologram so that the eyeglass lens frame is out of the hologram
frame; IOW you cannot tell by inspection that it was shot through the
lens of my glasses- there is no available viewing angle that does not
"see through" the lens? With an ordinary camera one would simply put
the eyeglass lens up next to the camera lens but that probably won't
work with holography.
(Come to think of it one would use the converse of my prescription,
yes/no? Did I mention this is way outside my area of expertise?)
Also, what sort of distortion do you mean? When I hold my glasses
away from my face and look through them, objects appear smaller than
usual just like the infamous warning sticker on car mirrors (I am
nearsighted) but not blurred at all until the lenses are about six
inches away from my eyes which conveniently is about where I can
barely begin to focus on the lenses themselves.
Would there not be a range of viewing distances where I would,
without my glasses, be better able to view the hologram than a person
with normal vision viewing it at the same distance?
Mark L. Fergerson