Strange vision problem

Discussion in 'Eye-Care' started by DarkProtoman, Jun 18, 2007.

  1. DarkProtoman

    DarkProtoman Guest

    I'e got this extremely weird problem: My refractive errors are as

    OS: +1.00D
    OD: +4.50D

    Now, my OD gave my, as you would expect, a -1.00D lens for the left
    eye, and a -4.50D lens for my right eye. But the left eye only gets
    slightly better, while I can't notice anything w/ my right eye.
    But...when I swap the left and right lenses, my left eye becomes
    20/20, and my right eye, while still far from that, gets a small
    improvement. How can this be? Also, when I put the new left eye lens
    on my right eye, and flip it backwards, aside from it needing a slight
    power adjustment and a weird fisheye effect, my right eye is noticebly
    improved. What's with this?

    Thank you!!!!
    DarkProtoman, Jun 18, 2007
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  2. DarkProtoman

    otisbrown Guest

    Dear Dark Proto Man,

    I'e got this extremely weird problem: My refractive errors are as

    OS: +1.00D
    OD: +4.50D

    Dark> Now, my OD gave my, as you would expect, a -1.00D lens for the
    eye, and a -4.50D lens for my right eye.


    Otis> Then your OD gave you the incorrect lens for your
    stated refractive error.

    Otis> Using the Donders theory, you should have been

    OS (left eye) +1 diopter lens for the +1 error. (Or no lens
    if you had 20/20. This would be optional, if you
    have 20/20.

    OD (right eye) +4.5 diopters lens for the +4.5 diopter
    refractive ERROR. This would be a classic perscription.

    Otis> Did your optometrist explain WHY he was
    prescribing a -1 and a -4.5 diopter lens?

    Just one man's question.

    otisbrown, Jun 19, 2007
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  3. DarkProtoman

    FKS Guest

    Something's wrong with the above statement.
    FKS, Jun 19, 2007
  4. DarkProtoman

    Dan Abel Guest

    You just have to learn Otis-speak. Makes perfect sense to me. I doubt
    that it makes sense to whoever refracted him.
    Dan Abel, Jun 19, 2007
  5. DarkProtoman

    DarkProtoman Guest

    No, I had the optician check my lenses as soon as I got them w/ a
    lensometer; he said they matched the prescription.
    DarkProtoman, Jun 19, 2007
  6. DarkProtoman

    otisbrown Guest

    Dear Protoman,

    Optometrist Judy is correct about this.

    otisbrown, Jun 20, 2007
  7. DarkProtoman

    Ms.Brainy Guest

    Dr Judy will be thrilled to read Otis' approval, I'm sure.
    Ms.Brainy, Jun 20, 2007
  8. DarkProtoman

    otisbrown Guest

    Dear Dark,

    The easiest solution is this:

    Call the OD, or ophthamologist and ask him
    if you are farsighted or myopic.

    That will resolve the issue, pronto.

    If the prescription is "positive", then you have
    plus lenses.

    A positive lens will bring sun's rays of light to a point.

    A +1 to a point at 1 meter. You could hold the lens in
    sun light and see if it forms a image of the sun at 1 meter.

    If the light rays diverge (no image), then you have
    a negative lens.

    Hope this clarifies this issue for you.

    otisbrown, Jun 20, 2007
  9. DarkProtoman

    DarkProtoman Guest

    I am myopic. I need minus lenses. My left eye is my good eye.
    DarkProtoman, Jun 20, 2007
  10. DarkProtoman

    otisbrown Guest

    Pervious: I'e got this extremely weird problem: My refractive errors
    are as

    OS: +1.00D
    OD: +4.50D

    Otis> Then these values should be:

    OS: - 1.00 Diopters (Refraction)
    OD: - 4.5 Diopters (Refraction).

    The lens you have must be minus to clear your distant vision.

    otisbrown, Jun 20, 2007
  11. DarkProtoman

    p.clarkii Guest

    do you think that you addressed his questions? do you think that he
    understood what you were trying to say?
    why can't you just write clear sentences and organize your thoughts in
    a straight-forward manner so that a normal logical person can
    understand you?

    anyway, regardless, I don't understand what you are trying to tell the
    original poster other than he should get an explanation from his eye
    doctor for why he was given this prescription. and I agree with you
    on that. why can't you just write it that simply?

    do you have problems organizing your thoughts? have you noticed that
    your brain just doesn't seem to work like other people's do? maybe
    some medication and some counseling could help.
    p.clarkii, Jun 21, 2007
  12. DarkProtoman

    p.clarkii Guest

    a persons refractive error, by convention, using the same power of
    lenses that are required to correct it. Thus, if your refractive
    error OD (=right eye), is +4.50 then the lens power that is required
    to correct that refractive error is a +4.50 lens. that is simply just
    a matter of convention. Also, as a matter of convention the right eye
    prescription is written before the left eye (=OS) prescription. in
    your post you do not seem to follow the accepted conventions, so it is
    hard to give you advise since I cannot tell for sure what your
    prescription is.

    did the doctor tell you if you are farsighted or nearsighted? and
    without any corrective lenses is your distance vision (where targets
    are >10 ft.away) pretty clear or is it blurry? what are the exact
    numbers that are written on your prescription? when you take off your
    eye glasses and hold them a few inches away from some printed words do
    they seem to magnify those words, or make them look slightly smaller?
    are your lenses thicker at the edges or in the middle?
    p.clarkii, Jun 21, 2007
  13. DarkProtoman

    p.clarkii Guest

    wow, thanks Otis! now we feel much more comfortable accepting Dr.
    Judy's comments after you have given them your approval. after all,
    she is only a professionally-trained and board-certified optometrist
    with years of clinical experience. its good to know that you, being a
    retired ex-engineer (? maybe), approve of her advise.
    p.clarkii, Jun 21, 2007
  14. DarkProtoman

    p.clarkii Guest

    OK, then your prescription should be written according to proper
    convention as:

    OD: -4.50 sph
    OS: -1.00 sph

    the right eye is listed first, and the left eye last.

    technically you are correct in that your uncorrected right eye is
    really +4.50 with respect to proper focus, and your uncorrected left
    eye is +1.00, and therefore you need minus lenses of the same power to
    correct them, but convention holds that nearsighted people need minus
    power lenses and thus the prescriptions are written that way always.
    in the end, all prescriptions are written in terms of the power of the
    lenses that are required to correct them.

    As for your observations, some of them can be explained and others
    can't. since your left eye is already pretty good without the lenses
    on it, so when you place a -1.00 lens over it you might not notice a
    big difference because it wasn't too bad to begin with.

    And in younger people, if you place an excessively strong minus lens
    over your eye, like in your case where you put your right lens in
    front of your left eye, it might appear to make your vision even
    clearer than having the proper -1.00 correction over it. In reality
    your acuity shouldn't be improved-- it just makes everything look
    higher contrast (darker and smaller). Some people usually like their
    vision through an overminused prescription but if you wear it too long
    it will give you eyestrain and headaches. Eye doctor try to avoid
    overminusing their patients

    What doesn't make sense is that putting the -4.50 prescription in
    front of your right eye doesn't provide much improvement. It
    certainly should unless you are amblyopic in that eye and you don't
    use it much anyway. Or perhaps the prescription is incorrect.

    Why not visit your eye doctor and ask for an explanation for your
    p.clarkii, Jun 21, 2007
  15. DarkProtoman

    DarkProtoman Guest

    I AM amblyopic in my right eye; I'm myopic in both eyes. I'm seeing
    Dr. Leif Hertzog, my opthalmologist, on July 11th. And, I do get a
    huge increase in acuity; I can read stuff at longer distances than
    before I swapped my lenses; I can read the "no parking" sign from 15ft
    away now; I couldn't do that before.
    DarkProtoman, Jun 21, 2007
  16. DarkProtoman

    otisbrown Guest

    Dear DarkProtoman,

    It is always good to be able to double-check your
    prescription against the lens you are provided with.

    It is also possible to reverse the OD and OS.

    Dr. Leif Hertzog will be very supportive of your
    desire to learn how to check in this matter,
    and that you were able to detect a
    techincal problem with the prescription.

    Most ophthamologists support your ability
    to learn about this subject.

    Others (tragically) do not trust your
    technical ability.

    otisbrown, Jun 21, 2007
  17. DarkProtoman

    otisbrown Guest

    Ah, yes.

    Ho, Ho, Ho -- good optometric laugh line.

    Because SOME patients are stupid, and technically
    inept -- you naturally ASSUME that all
    patients are stupid and inept. And should
    be treated that way.

    otisbrown, Jun 21, 2007
  18. DarkProtoman

    Neil Brooks Guest

    Dear Uncle (scr)Otis:

    As always, your hypocrisy astounds. YOU are the king of:

    - invent a position held by a (fictitious or otherwise) eye doctor;

    - extrapolate from that invented position to the presumed "standard
    of practice" of ALL eye doctors.

    Nobody else around here does that BUT YOU.

    God, but you're an idiot.
    Neil Brooks, Jun 21, 2007
  19. DarkProtoman

    Neil Brooks Guest

    Gosh, Uncle Otie.

    On what basis do you make THAT claim.

    Just some little tidbit that you pulled from your a$$?

    Par for the course, sadly.
    Neil Brooks, Jun 21, 2007
  20. DarkProtoman

    DarkProtoman Guest

    What this Otis Brown guy's story anyway? He needs to be crucified
    while getting a 10 gigacandela light shined through +100D lenses in
    his eyes --w/ atropine eyedrops for good measure--...
    DarkProtoman, Jun 21, 2007
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