Comments for Webvision http://webvision.med.utah.edu The Organization of the Retina and Visual System Tue, 21 May 2013 00:04:07 +0000 hourly 1 http://wordpress.org/?v=3.5 Comment on Visually Evoked Potentials by Lynnette Siegel http://webvision.med.utah.edu/book/electrophysiology/visually-evoked-potentials/#comment-479058 Lynnette Siegel Tue, 21 May 2013 00:04:07 +0000 http://webvision.med.utah.edu/?page_id=1993#comment-479058 Thanks for the reply. I think they are using this for some other measure, as the column next to the N column is the P1, N1, P2, N2, etc. column, and then next to that is the msec measurement. And I don’t know the meaning of the “k” being used with the numerical value of “N”. In any event, since they used English letters I will just copy it over and hopefully it will mean something to the receiving doctors. I thank you again for your reply–I am also a UMKC alum, by the way!

]]> Comment on Visually Evoked Potentials by Donnell Creel http://webvision.med.utah.edu/book/electrophysiology/visually-evoked-potentials/#comment-479042 Donnell Creel Mon, 20 May 2013 23:02:01 +0000 http://webvision.med.utah.edu/?page_id=1993#comment-479042 N is usually for negative. VEPs have polarity, positive and negative. N1 means the first major negative polarity component at about 75 msec. The first major positive component, P1, is usually between 100 – 110 msec. N2 more variable at about 150 msec. I do not know Russian VEP nomenclature.

]]> Comment on Simple Anatomy of the Retina by Retinal Prostheses: Restoring Vision to the Blind | Knowing Neurons http://webvision.med.utah.edu/book/part-i-foundations/simple-anatomy-of-the-retina/#comment-478895 Retinal Prostheses: Restoring Vision to the Blind | Knowing Neurons Mon, 20 May 2013 16:01:26 +0000 http://155.100.105.205/#comment-478895 [...] adapted from Webvision, the National Eye Institute, Gadget Review, and made by Ryan [...]

]]> Comment on Visually Evoked Potentials by Lynnette Siegel http://webvision.med.utah.edu/book/electrophysiology/visually-evoked-potentials/#comment-478894 Lynnette Siegel Mon, 20 May 2013 16:01:18 +0000 http://webvision.med.utah.edu/?page_id=1993#comment-478894 Hello. I am translating the results of a flash VEP conducted in Russia (I am translating Russian to English) and cannot find any information on what the abbreviation “N” might mean, which they have measured in “k”, for example N 1.1k, or N 4.1k. I would appreciate any help you might be able to provide. I just noticed you are a Kansas City, native. That is where I am from and working right now! Thanks again.

]]> Comment on Part XIV: Evolution of Phototransduction, Vertebrate Photoreceptors and Retina by New Webvision Chapter: Evolution of Phototransduction, Vertebrate Photoreceptors and Retina – Webvision http://webvision.med.utah.edu/book/part-xiv-evolution-of-phototransduction-vertebrate-photoreceptors-and-retina/#comment-475131 New Webvision Chapter: Evolution of Phototransduction, Vertebrate Photoreceptors and Retina – Webvision Wed, 15 May 2013 17:07:14 +0000 http://webvision.med.utah.edu/?page_id=5458#comment-475131 [...] of this particular effort, we have a spectacular new addition to Webvision:  A section on the Evolution of Phototransduction, Vertebrate Photoreceptors and Retina by Trevor D. Lamb.  Be sure to check it out and let us know what you think in the [...]

]]> Comment on Origin of Vertebrates and the Diversity of Extant Chordate Eyes by New Webvision Chapter: Evolution of Phototransduction, Vertebrate Photoreceptors and Retina – Webvision http://webvision.med.utah.edu/book/part-xiv-evolution-of-phototransduction-vertebrate-photoreceptors-and-retina/origin-of-vertebrates-and-the-diversity-of-extant-chordate-eyes/#comment-474715 New Webvision Chapter: Evolution of Phototransduction, Vertebrate Photoreceptors and Retina – Webvision Wed, 15 May 2013 07:14:44 +0000 http://webvision.med.utah.edu/?page_id=5463#comment-474715 [...] of this particular effort, we have a spectacular new addition to Webvision:  A chapter on the Evolution of Phototransduction, Vertebrate Photoreceptors and Retina by Trevor D. Lamb.  Be sure to check it out and let us know what you think in the [...]

]]> Comment on Morphology and Circuitry of Ganglion Cells by Human Retina In Color – Jonesblog http://webvision.med.utah.edu/book/part-ii-anatomy-and-physiology-of-the-retina/morphology-and-circuitry-of-ganglion-cells/#comment-473945 Human Retina In Color – Jonesblog Tue, 14 May 2013 05:33:36 +0000 http://155.100.105.205/?page_id=103#comment-473945 [...] image of ganglion cells, Müller cells and starburst amacrine cells in the human retina is from a patient suffering from [...]

]]> Comment on Light and Dark Adaptation by Alex http://webvision.med.utah.edu/book/part-viii-gabac-receptors/light-and-dark-adaptation/#comment-471373 Alex Thu, 09 May 2013 18:47:03 +0000 http://155.100.105.205/?page_id=163#comment-471373 Hey Shraddha,

We are testing night vision adaptation in our lab. Are you someone who’s eyes do not adapt in the dark, even after long periods of time? Would be interested to here more..if it is a medical anomaly, we could pay you to come to our lab.

]]> Comment on The Electroretinogram and Electro-oculogram: Clinical Applications by sahar http://webvision.med.utah.edu/book/electrophysiology/the-electroretinogram-clinical-applications/#comment-471322 sahar Thu, 09 May 2013 17:02:22 +0000 http://155.100.105.205/?page_id=188#comment-471322 Hi,thank you very much for this article.could you send me a raw data of eog signal(with right and left movements)?
thank you

]]> Comment on Visually Evoked Potentials by Donnell Creel http://webvision.med.utah.edu/book/electrophysiology/visually-evoked-potentials/#comment-471245 Donnell Creel Thu, 09 May 2013 13:56:31 +0000 http://webvision.med.utah.edu/?page_id=1993#comment-471245 MRIs show changes in anatomy. The slowing of your VEPs might be due to physiological slowing of optic neurons with no visible demyelination.

]]> Comment on Visually Evoked Potentials by vahid http://webvision.med.utah.edu/book/electrophysiology/visually-evoked-potentials/#comment-471091 vahid Thu, 09 May 2013 06:57:42 +0000 http://webvision.med.utah.edu/?page_id=1993#comment-471091 Hi
I am 30 years old male
My VEP result is :
P100 in Trial 1: 143
Trial 2: 141.4
Trial 3: 143.4
Trial 4: 141.8

help me please to know what s the probable reason while my MRI shown nothing about MS

]]> Comment on Visually Evoked Potentials by Ray http://webvision.med.utah.edu/book/electrophysiology/visually-evoked-potentials/#comment-462887 Ray Fri, 26 Apr 2013 18:09:09 +0000 http://webvision.med.utah.edu/?page_id=1993#comment-462887 Thank you Dr. Creel

]]> Comment on Visually Evoked Potentials by Donnell Creel http://webvision.med.utah.edu/book/electrophysiology/visually-evoked-potentials/#comment-462857 Donnell Creel Fri, 26 Apr 2013 16:54:56 +0000 http://webvision.med.utah.edu/?page_id=1993#comment-462857 Yes, you are correct. It is important that your acuity is good when VEPs are recorded. Blurry vision can make VEP result abnormal.

]]> Comment on Visually Evoked Potentials by Ray http://webvision.med.utah.edu/book/electrophysiology/visually-evoked-potentials/#comment-462822 Ray Fri, 26 Apr 2013 15:11:21 +0000 http://webvision.med.utah.edu/?page_id=1993#comment-462822 I had a multifocal iol implanted in my right eye. I have since developed secondary cataract and will need YAG surgery to clear up my cloudy vision. My night vision and mid-vision in the right eye is especially cloudy. I took a VEP test without using a correction lense and the results were abnormal in my right eye only. Is it possible that the secondary cataract and poor iol mid vision could affect test results? My MRI was normal and the doctor said my eyes showed no optic nerve damage.

]]> Comment on Phototransduction in Rods and Cones by Seminar: Shannon Boye, Gene Therapy for Photoreceptor-Mediated Retinal Disease: Leber Congenital Amaurosis-1 (LCA1) – Webvision http://webvision.med.utah.edu/book/part-v-phototransduction-in-rods-and-cones/phototransduction-in-rods-and-cones/#comment-462132 Seminar: Shannon Boye, Gene Therapy for Photoreceptor-Mediated Retinal Disease: Leber Congenital Amaurosis-1 (LCA1) – Webvision Thu, 25 Apr 2013 17:55:27 +0000 http://155.100.105.205/?page_id=137#comment-462132 [...] (LCA1). GUCY2D encodes guanylate cyclase-1 (GC1), a photoreceptor-specific protein involved in phototransduction. This presentation will summarize my lab’s efforts to develop an AAV-based therapy for treatment [...]

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