Invitation to 'test our test' for finding hidden blindspots in your field of vision

Discussion in 'Eye-Care' started by Bertil Damato, Sep 22, 2003.

  1. Mr Carl Groenewald and I are consultant eye surgeons in England. In
    our spare time, we have developed a visual field test for the
    internet, which allows anyone to perform self-examination, using a
    personal computer and at their own convenience, free of charge.



    Our test may enable people to become aware of visual loss and perhaps
    to check whether they are improving or getting worse. Some might
    become detect new defects so that they can obtain medical advice or
    take special precautions, for example if they drive a car.



    Conditions causing visual field loss include glaucoma, retinal
    detachment, macular degeneration, pituitary tumours, other brain
    tumours, strokes, Sturge Weber syndrome, von Hippel Lindau disease,
    and many others. Not all visual field defects indicate serious disease
    and false positive and negative results can occur (with any test).



    I would be grateful if anyone could participate in our research
    project and help us evaluate our test. We urgently need persons with
    visual field defects to visit our website and send us feedback so that
    we can make improvements. Hopefully the test will be found
    interesting, a little like a computer game. It is quite different from
    conventional tests so please read the instructions, see the demo and
    do a rehearsal before trying the test. If you could perform the
    sensitive version of the test, this would be ideal.



    Our website is at http://www.testvision.org/



    Please remember to e-mail us the results with your email address if we
    may reply to you (but note that we are only able to comment on your
    result and not on any ocular or medical problem you might have).

    It would be helpful if you let us know what you like or don't like
    about our test.



    Yours faithfully,



    (Professor) Bertil Damato PhD FRCOphth

    St Paul's Eye Unit

    Royal Liverpool University Hospital

    Prescot St

    Liverpool L7 8XP



    Tel: +44 (0)151 706 3973

    Fax: +44 (0) 151 706 5436



    E-mail:
     
    Bertil Damato, Sep 22, 2003
    #1
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  2. Bertil Damato

    Earle Jones Guest

    *
    As of 3:53 PM PDT on 9-22-03, the above link works up to the "Basic -
    Standard - Advanced" screen and then hangs up.

    earle
    *
     
    Earle Jones, Sep 22, 2003
    #2
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  3. The links didn't work on this. Is it working yet?
     
    lasik advocate with flap melt, Sep 26, 2003
    #3
  4. Bertil Damato

    Earle Jones Guest

    *
    The link is still broken at 9:04 PM PDT on 9-25-03.

    earle
    *
     
    Earle Jones, Sep 26, 2003
    #4
  5. Bertil Damato

    Jim Lawton Guest

    The basic test worked for right eye, but didn't let me proceed to left eye.
    the advanced intermediate test worked ok. Not tried advanced yet ...
    J
     
    Jim Lawton, Sep 26, 2003
    #5
  6. I took this test a few days ago and forgot to post the results... The
    basic test worked on the first attempt for both eyes. The advanced
    test did not let me proceed for the first eye I tested, saying it did
    not detect my normal blind spot. I tried it twice with the same
    result.

    Lothar
     
    Lothar of the Hill People, Sep 26, 2003
    #6
  7. Bertil Damato

    Jim Lawton Guest

    Much the same for me - the site could do with some general explanation up front,
    also there's no indication of what level one should hold one's head.

    I didn't see any upfront contact email address to comment on failures of the
    website links etc etc.

    I'm also pretty sure I've got a blind spot in my right eye - I had an RD a feww
    years ago, and had surgery, and yet this has not yet spotted it.

    Yes, I'm going to give it another go. - got to go clean the pond first, getting
    a bit leafy round here :)

    and what on earth is this in the acknowledgements?
    http://www.rawcutdesign.co.uk/

    J
     
    Jim Lawton, Sep 26, 2003
    #7
  8. Bertil Damato
     
    Bertil Damato, Sep 26, 2003
    #8
  9. Bertil Damato

    andrew Judd Guest

    The advanced test does not work properly

    the smiley appears.....I click on it....a black circle appears.....and
    then is replaced by a smiley....*before* i click on it.
     
    andrew Judd, Sep 26, 2003
    #9
  10. Thank you very much for your comments - we're learning a great deal
    from your feedback.

    The stimulus has a hidden target zone around it so that teh smiley
    appears when you enter the correct area - otherwise it would be too
    difficult.

    The link at the end of the basic test is being fixed.

    We will add our e-mail address to our introductory page for replies
    and comments.

    We will alter the note at the end of the test so that it is less
    intimidating if the normal blindspot is missed.

    It does not matter too much whether the eyes are level with the centre
    of the computer screen but we will write something about this.

    We had no idea that the site of an acknowledgement had changed.
    Perhaps the artist who drew our pictures has stopped working in this
    field. We will remove this acknowledgement.

    Please keep criticising and I hope we can solve all problems.

    Bertil Damato
     
    Bertil Damato, Sep 27, 2003
    #10
  11. May I respectfully reply to those who disagree with self-testing of
    the visual field on the internet.

    First of all, our test measures the visual field to 24 degrees and not
    just 5 degrees, and this is possible because we use multiple fixation
    points.

    Second, our test is not designed to replace any conventional
    examinations and not intended as a means to avoid seeing a qualified
    practitioner. The purpose of our test is to bring visual field defects
    to attention so that proper care from a qualified practitioner can be
    obtained at an early stage.

    Third, the aim of our test is to detect moderate and advanced visual
    field defects indicating disease requiring the most urgent treatment.

    Fourth, self-testing of the visual field under medical supervision as
    an adjunct to clinic examinations has long been considered useful
    practice in selected patients, using the Amsler grid, for example in
    patients with macular degeneration. There is no reason why our test
    should not be used in the same way, if our research confirms its
    validity.

    We are still investigating our test to find out how well it works and
    are certainly not suggesting that it should replace other methods.

    If anyone wishes to try our test, do a search in Google for 'Damato
    Visual Field Test'.


    Bertil Damato
     
    Bertil Damato, Oct 31, 2003
    #11
  12. I found the test instructions confusing: look at the blue dot and put the
    red one in the normal blind spot -- I have not a clue what that means.
    There also seems to be a test consistency problem vis a vis use of the
    mouse. Assuming the mouse stays where it is, placing the opposite hand
    over an eye will likely garner different results than using a foreign
    object (tissue, cloth) to cover an eye, but then getting that object to
    stay in place is not so easy without taping.

    Gene Goldenfeld
     
    Gene Goldenfeld, Oct 31, 2003
    #12
  13. Bertil Damato

    mans Guest

    Another problem I see right off the bat....the test instructions are very
    difficult to read due to background colour and poor definition of
    print...as a person with a very restricted visual field, problems with glare
    and poor acuity, I find white on black and black on white the best with at
    least a 12 point font. I know you can increase font size on web sites, but
    that sometimes alters presentation of the functional part of the website.
    Anyway, I did not enjoy the colour schemes...a small but difficult area for
    a lot of us to cope with.\

    Bill
     
    mans, Nov 2, 2003
    #13
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