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Re: Computer displays that correct vision possible?
| Richard J Kinch | 20 May 2008 07:17 |
> For the same reason that you can't use a hologram of a microscope lens > to replace the lens. I don't follow that reasoning. We're postulating refractive optical elements, not holograms.
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| Helpful person | 19 May 2008 11:47 |
> > Actually, this isn't really an issue with a holographic display, ... > [quoted text clipped - 4 lines] > make us myopes (or whatever your refractive error) see them properly > without having to have apparatus on our heads. For the same reason that you can't use a hologram of a microscope lens to replace the lens. You can get correct reconstruction only at one field position and one set of conjugates.
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| Richard J Kinch | 19 May 2008 03:30 |
> Actually, this isn't really an issue with a holographic display, ... The question was whether it could be done with lenses.
It's an old and worthwhile question. If eyeglasses make you see properly, then why can't we invert the system and put "object glasses" on things to make us myopes (or whatever your refractive error) see them properly without having to have apparatus on our heads.
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| Quadibloc | 18 May 2008 21:02 |
> > So maybe this is possible as well? > > No. Corrective lenses must be near, or on (as in contact lenses) the eye. Actually, this isn't really an issue with a holographic display, but since holographic displays don't yet exist, the kind of 3D displays which do exist don't imply that any technology would exist that would help.
In the case of a holographic display, able to create any arbitrary light wavefront, if the corrective lens has to be within 1 cm of the eye... then the only constraint is that the position of the head with respect to the laptop has to be controlled to a tolerance of 1 cm.
Instead of bolting the laptop to one's head, it could even use infrared sensors to monitor the position of one's head!
John Savard
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| Richard J Kinch | 09 May 2008 08:23 |
> So maybe this is possible as well? No. Corrective lenses must be near, or on (as in contact lenses) the eye.
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| Amir Michail | 03 May 2008 13:34 |
Imagine using a laptop without having to wear corrective eyeglasses.
I know that 3D displays exist that don't require special glasses.
So maybe this is possible as well?
Amir
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