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albinowonder2 asked in HealthOptical · 1 decade ago

3d glasses with turning in of the eye and moving of the eye?

I just got the 3d version of the movie Coraline for Christmas. I have albinism so one of my eye's turns in and they both movie back and forth involuntarily. I don't really know how the 3d glasses work (they are red and green). Do you have to be sitting far back from the screen for it to work? Or does my vision problems prevent them from working since I don't see straight forward with both eyes?

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  • 1 decade ago
    Favorite Answer

    Your nystagmus (involuntary eye movement) will undoubtedly affect 3D movie clarity, just as it affects your depth perception.

    Stereo, or binocular, vision requires an alignment of the two eyes. The dominant eye looks directly at the object, the non-dominant eye looks at the same object at a slight angle. The brain uses the difference in images each eye sees from these two angles to determine the distance of an object. This is the essence of depth perception. Two eyes apart from each other looking at a single object.

    Three dimensional (3D) movies take advantage of how the brain deciphers depth by projecting the same image with a blue tint and a red tint (or green), but the images are slightly apart. The 3D glasses provide a blue filter on one eye and the red (or green) on the other eye. By filtering the doubled images with the 3D glasses, you have what amounts to an inverse of normal binocular images - two same objects apart from each other being seen by a single eye. The brain interprets this into stereo vision, or 3D. You are "fooling" the brain into seeing depth that is not actually on the screen.

    If your nystagmus is bilateral - that is both eyes move erratically but the same - then you would likely be able to see 3D about as well as you can see anything else. If one eye moves independent of the other, the binocular vision needed for the 3D effect would likely be out of alignment enough to diminish the effect.

    Your albinism may cause a color shift that may affect your ability to see 3D. Studies have shown that some affected by albinism have a "widening" into the red end of the visible spectrum. This shift may affect any projected image that utilizes light color filtering for effect, such as 3D. You may be able to determine if there is a color shift with a standard color-blindness test.

    It seems likely that the older red and green technology typically used on television 3D is incompatible with a color shift you may have and may be exasperated by transient nystagmic misalignment of the images.

    I have partial red-green colorblindness. The older technology 3D with the red and green lenses simply does not work for me and I see nearly the same as if I wore no glasses at all. The newer technology seems to work much better. I watched the movie Avatar with a DLP projection and the new technology light filtering lenses and could see the depth quite well, but images are not as focused as described by those not affected by colorblindness.

    Source(s): Glenn Hagele Council for Refractive Surgery Quality Assurance http://www.usaeyes.org/
  • ?
    Lv 7
    1 decade ago

    I think the first long answer is misleading in several small ways.

    3D glasses work by blocking one part of the image for each eye. The part let through is slightly different for the right eye and the left and each represents what the corresponding eye would see if looking at the original object. (i.e. if you get real close to someone, your right eye can't see the ear on your left side of their head because the front of the head is in the way and the opposite for your left eye.)

    If you can see depth when looking at ordinary objects, you should be able to see it through the glasses. At worst, you could close or cover one eye and watch the movie in 2D omitting the distracting image that wouldn't merge for you.

    When the guy says he has red-green color blindness and thus sees the same thing without glasses, this is not true. First the colored lenses block color no matter what he can see and second without the glasses he would see both images shifted a bit just like we do, but he would see shades of gray while we would see one in red and one in green.

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