This video discussed advanced eye tricks you can perform on those “difficult” patients (malingerers, neuro disorders, and myasthenia gravis). This was recorded at an ophthalmic tech conference several years ago, but I’ve recently updated the slide-graphics and cleaned up the audio. Enjoy.
length: 15:31 minutes
SCREEN SHOTS FROM THIS VIDEO LECTURE:
(comments below)
The techniques for confirming fictitious blindness are discussed, including the handoff and shake.
The optokinetic drum and flag are used. Most people believe that your vision must be 20/200 or better to see optokinetic nystagmus.
Finger touch proprioception testing is shown. The pinhole PAM (potential acuity meter) test is then demonstrated (very useful before cataract surgery).
The entoptic phenomenon (Troxler fading or Purkinje effect) is shown. Then pencil field testing to determine macular sparing lesions.
Myasthenia Gravis can be detected with the upgaze test. The ice-pack rest test is shown as well.
Determining the dominant eye before surgery with the "ocular dominance test"
Comments and Feedback
10 Comments
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Is it not called entoptic phenomenon rather than photoptic phenomenon?
Comment by Deepak — August 12, 2009 @ 5:58 pm
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Yep, the “entoptic phenomenon” it is. I couldn’t remember the name or find it anywhere online when I prepared the lecture. It has also been described as the “Troxler’s fading phenomenon.” Thanks for the comment!
Comment by admin — August 12, 2009 @ 10:50 pm
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Where might I locate the latter 2/3 of the presentation? Has the remaining portion of this presentation benn published anywhere?
Comment by Sarah Glass — September 24, 2009 @ 10:06 am
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Great lecture - thanks
Comment by Jane — October 22, 2009 @ 11:56 am
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Great lecture
Comment by vamshi — December 6, 2009 @ 6:10 am
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Great stuff - I plan to study medicine and wouldn’t have particularly have gone to Ophthalmology but I am glad to have come across it. Interesting and fun stuff.
@Miss Marlene M.D - it is very stupid to post your site on this one promoting a subscription service for Medical Advice. Not only is it annoying, it promotes self diagnosis which in most cases can and will lead to further problems.
Respect this as an Educational free source of information.
Great stuff.
Regards.
Comment by Joe — December 3, 2010 @ 2:04 am
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Taught me a few tricks and I have been practicing ophthalmology here in South Africa for 20 years!
Comment by Clive Novis — September 7, 2011 @ 3:26 pm
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Great lecture,thanks for sharing,you are a an excellent teacher. I also think it is Entopic phenomenon, not photopic
Comment by Ngozichi Omekara — September 8, 2011 @ 5:12 am
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thanks for sharing
nice topic
Comment by osama — September 11, 2011 @ 4:09 pm
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