Pinhole glasses good for computer work?

Discussion in 'Glasses' started by Vjeran Marcinko, Nov 16, 2005.

  1. Hi all.

    I'm shortsighted programmer, wearing glasses with -1.0ph/0.5cyl dioptry on
    each eye, and after only 2 hours of working in from of my LCD, my eyes hurt
    quite a bit. In fact, they hurt all the time, because they don't have time
    to rest properly, even after night sleep.

    Now, I heard about this pinhole glasses. I've read a bit about how they
    work, and I know they will not improve my eyesight, but I'm curious whether
    they will put away strain on my eyes when I work in front of computer?

    I know they reduce peripheral vision, but I don't need peripheral vision
    when I work with computer.
    I know they reduce brightness, but I have enough of brightness (probably too
    much) from my LCD, so it doesn't bother me also.

    So, could it do me good?
    And most importantly, can they harm my eyes somehow?

    Vjeran Marcinko, Nov 16, 2005
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  2. Vjeran Marcinko

    Dom Guest

    They won't do any harm to your eyes, so by all means give them a go for
    a few hours. You'll probably find them so frustrating that you'll give
    up on them before long.

    Do you currently wear your distance vision specs while using the
    computer? If so, try taking them off. Also, try eye drops (artificial
    tears). I assume you've had a thorough eye test recently to exclude any
    other causes of sore eyes.

    Dom, Nov 16, 2005
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  3. Vjeran Marcinko

    acemanvx Guest

    why would you even need glasses for the computer? If your a -1 and sit
    1 meter(or closer) you will see better without glasses than with! I am
    about a -5 but wear -3.25 glasses for the computer and my eyes have
    never felt more relaxed! You dont even need to wear your glasses much
    except for driving or watching movies
    acemanvx, Nov 16, 2005
  4. Why don't you try. They come with different pinhole sizes
    and patterns. Usually they are the ultima ratio for people
    with 20 diopters :)

    For computer work you need glasses with varying focus.
    They are expensive and not every optician can make them.
    In fact, many sell glasses from cheap manufacturers
    and do not know how to handle varying focus glasses at all.
    You must specifiy "computer work", and explain what it means
    optically, otherwise they will set the upper part of the glasses to
    infinity focus, be careful, they are salesmen.
    Sometimes you need to look around the office, through the upper
    portion of the glass, that is 5 to 7 m distance,
    and the shortest distance at the bottom
    of the glasses will be keyboard, respectively reading a book,
    that is about 40 cm. Set the center to 70 cm or 1 m distance.

    I have such glasses and about the same diopters as you.
    Can work for hours without problems,
    although not the whole day, need to have a walk in the green
    Helmut Wabnig, Nov 16, 2005
  5. Doctor told me that even if I don't have any problems seeing things at close
    (because I am shortsighted), I should wear glasses constantly, because
    adaptation of eye when taking glasses off is not healthy...
    Vjeran Marcinko, Nov 16, 2005
  6. Vjeran Marcinko

    drfrank21 Guest

    Pinhole glasses to improve vision is simply a scam- they do not work.
    Sometimes dedicated computer glasses with ar (anti-reflective)
    a gradient tint can be of help. Also, sometimes using artificial tears
    looking away from the monitor every 15 minutes or so can reduce eye
    strain. But the pinholes are simply a waste of money.

    drfrank21, Nov 16, 2005
  7. Vjeran Marcinko

    acemanvx Guest

    sorry thats not true. In fact using glasses to see from near when you
    can see fine without will make vision worse, see pseudomyopia which
    eventurally will increase enlongation of the eye.
    You have the gift of seeing well from near without glasses, use it!
    acemanvx, Nov 17, 2005
  8. This statement is not true, at least not completely.
    What would "work" mean in such a context.
    You probably wanted to say,
    pinholes are not adequate replacements for optical glasses.

    Of course they work, pinholes are physically functioning optical
    elements, and can replace a camera lens
    Enter "pinhole" in Ebay:

    And when you combine many pinholes you get that:

    The effect is surprising,
    it is worth trying from a physics standpoint,
    and may be useful for certain eye illnesses
    although I prefer normal glasses :)

    Helmut Wabnig, Nov 17, 2005
  9. Vjeran Marcinko

    Louis Boyd Guest

    Pinhole apertures are commonly used in target pistol shooting to improve
    the depth of field by simultaneously reducing the blur of the front and
    rear sights as well as the target. There is no conventional transparent
    lens which can accomplish that. For certain types of eye defects a
    pinhole lens can provide better visual resolution than a full aperture
    glass lens. The downside of pinhole lenses is Limited field and reduced
    image brightness.

    "glasses" with multiple pinholes were used in some parts of the world
    long before glass lenses came into use. If the angular spacing of the
    holes is approximately equal to the angular field of view of one
    pinhole and in a hexagonal pattern. They give greatly improved
    resolution, particularly for us old folks who have limited focus
    accommodation. The "flys eye" effect takes some getting used to.
    Louis Boyd, Nov 17, 2005
  10. Vjeran Marcinko

    Dan Abel Guest

    They work, and they work really well.

    My son has a huge cast on his arm. It works really well also. I don't
    have such a cast, or want one. I'm sure my HMO would refuse to put one

    My wife hurt her foot some time back. She used crutches for a little
    time. I don't use crutches. I don't want crutches.
    Dan Abel, Nov 18, 2005
  11. Vjeran Marcinko

    Full Name Guest

    Yep. sun glasses. Reduce the BLUE.
    Full Name, Nov 18, 2005
  12. Vjeran Marcinko

    otisbrown Guest

    Dear Vjeran,

    Subject: Pinholes and other alternatives
    to "relax" accommodation.

    Sometime long work at a computer terminal creates "pseudo-myopia" a
    condition where you MIGHT fail the eye-test.

    In addition to pinhole glasses, you might
    consider using "relaxing" plus lenses which you can obtain
    over-the-counter for about $8.

    Some ODs will prescribe this lens for children on the threshold of
    myopia, to
    help them "relax" their eyes.


    otisbrown, Nov 18, 2005
  13. Vjeran Marcinko

    CatmanX Guest

    Or he can take his glasses off, save some money and get the same

    A script of -1.00/-0.5 R&L means you are focussed at 80cm so you are
    pretty well focussed on the screen with no Rx. There is no problem
    doing this for most people and no adaptation problems either. Try it,
    you may find it improves things.

    CatmanX, Nov 18, 2005
  14. Vjeran Marcinko

    Peng Xi Guest

    I think you'd better wear an coated glass rather than pinhole glasses. I had
    a pair of pinhole glass in high school and I know how it works: it just
    force your eye to use the most sensitive part -- center of your retina where
    the cell is smaller than usual and the paraxial optical quality is better.
    As a result, the radiance from the computer starts to hurt your most
    sensitive part of your eyes... Pinhole glasses is traditionally used for
    ophthalmologists, to test the vision of your central part of the eye.
    So, keep using your eye in a healthy way is the best solution. The
    coating and resin-based glasses will work because the transmission of UV is
    nearly 0. Eyedrops (artificial tear) will keep your eye cells "breath" and
    alive. Wish these help.
    Peng Xi, Nov 21, 2005
  15. Vjeran Marcinko

    Dan Abel Guest

    I've never heard of the word "paraxial" and neither has my dictionary.

    It's nice that you know they work, however, I don't believe that is

    There are three ways that I know of that pinhole glasses help vision:

    1. They increase the depth of field. If you can't focus near (or far),
    the pinhole glasses may increase your range to where things are in focus.

    2. If you are astigmatic, then the pinhole glasses remove that problem.

    3. If you have cataract, then the pinhole may allow you to find an area
    through the cataract that is clearer.
    Dan Abel, Nov 21, 2005
  16. Vjeran Marcinko

    Grandpa Guest

    You must be kidding: there are 721 entries for the word "paraxial" in
    Google Search, Sci. Optics.

    Grandpa, Nov 21, 2005
  17. Vjeran Marcinko

    Dan Abel Guest

    I took an optics course. It was in 1969, and was a one quarter physics
    Dan Abel, Nov 22, 2005
  18. Vjeran Marcinko

    Peng Xi Guest

    I think Ian omit a fact: what if the pinhole glasses has only 1 hole? Can
    you see the world as it was without the glasses? You may think that this is
    kidding, but have you done a simple experiment?
    The glasses I used has 3 holes on each eye, with totally black plastic
    glasses to block light. I happen to have no black paper to do this but I did
    use white paper board to prove my point.
    I think most of us are near sight and able to do this immediately.
    Remove your glasses and put a pinhole on your eye, find a target you cannot
    see clear (even it is monitor screen) and see what can happen?
    Pinhole glasses cannot work on a very near-sight eye, however, if the hole
    size is proper (to allow enough light come while still able to limit the
    light through the pupil), you can see a sharper image.

    Ian said that the edge of the pupil can be aberrant -- do you think that the
    random edge of a piece of paper is better than our body which is God's
    Peng Xi, Nov 22, 2005
  19. Vjeran Marcinko

    Peng Xi Guest

    Hehe, in this sense our conclusions are the same -- your point is that the
    optical imaging quality for the central part of the lens is better, which is
    exactly what I mean. In this way, the field angle is limited; however
    because a better lens is used, we can see more sharp.
    Another issue I want to address is the cell size -- it is really
    smaller than the rest part of retina. When we are using skillfully what God
    gives us (by applying a small hole to simulate the shrink of the pupil), we
    get a better image under strong incidence. If you look around you will know
    that your central part of vision is much much better than the rest, and this
    is because of both the cell (as a CCD pixel) size and also the way our brain
    deals with the infomation.
    Back to the original question, this is unacceptable to an computer user
    because he will fell better and then he keeps using it this way, however the
    harmful light will still there and hurts.
    Peng Xi, Nov 22, 2005
  20. Vjeran Marcinko

    danek Guest

    It isn't the light that is harmful. It is the fact that we blink less
    when using a monitor and don't refocus the eyes regularly. Our eyes
    weren't designed for staring without blinking which is what we tend to
    do when working at a monitor.

    P. Danek
    danek, Nov 23, 2005
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