Vision Disorders

Substance-induced Persisting Altered Visual Perception

Vision Simulator for Demonstrating “Starbursting”

Gallery of HPPD Images from HPPD Sufferers

Altered Vision Simulators

A need for a common language for Altered Persisting Visual Perceptions

Published on January 7th, 2012 by David S. Kozin in HPPD

The research and clinical community must not hinder the ability for the disciplines to communicate common symptoms in the same language. An excellent example is the wonderful work from the K Internet searchers where keywords are used for developing relationships between articles. Kawasaka et al. (196) reports three clinical cases of HPPD patients in the Archives of Ophthalmology. Three patients with HPPD symptoms in the clinic with common symptoms and test results. The authors’ provide one common explanation for the lack of knowledge with diagnosing HPPD patients as the lack of shared terminology among related disciplines for the same experience: “1) Palinopsia (and the trailing variant) as a symptom of hallucinogen use is not present in the neurologic or ophthalmologic literature. The only notable case in ophthalmologic literature reporting visual illusions from hallucinogen use were Levi and Miller (1990),” the authors state, “palinopsia, as well as other chronic visual disturbances from LSD, has been well detailed in the psychiatric literature… One possible reason for this discrepancy may be differences in descriptive terminology. Psychiatrists do not use the term palinopsia; instead, they refer to this symptom as ‘aflerimagery’ or ‘visual flashbacks.’” With over thousands of pages of text collected from the

(More)…

Comments Off

Vision Simulator for Demonstrating “Starbursting”

Published on December 29th, 2011 by David S. Kozin in Visual Simulators

Dr. Roger Davis, a close friend and co-author of other vision simulators on this site, has an amazing simulator for private use on his website www.visionsimulations.com. http://www.visionsimulations.com/index.php?option=com_content&task=view&id=56&Itemid=149 I created an image to represent what I see:

Comments Off

First Livestream Discussion of HPPD and Altered Visual Perception Disorders

Published on December 24th, 2011 by David S. Kozin in DPD/DR, HPPD

Members of the HPPD and Visual Snow community have posted many questions about HPPD on their support web site, and some of these questions are directed to me and you have not received answers. My thesis text “Characterization of Hallucinogen Persisting Perception Disorder” has one final form bound in the library, and because of the dynamic discussions with Dr. Henry David Abraham and new information coming to light, the text is a puzzle of about 400 pages of text. Eventually, I plan to complete the text. I will include the updated information from my oral debates and as new information is submitted to me and to submit it for online publication. My solution, which is in lieu of answering 500 odd e-mails, is to use a new way to communicate to the HPPD community as a group. First, to give a lecture regarding the the current state of HPPD, and the disorders with similar symptom profiles, via Live streaming video with interactive chat.You will be able to log in and ask questions during the presentation and I will take questions towards the end. Additionally, users will be able to share their own answers in a common moderated chat room. The

(More)…

Comments Off

My qEEG Report. Evidence for Persisting Visuals

Published on October 7th, 2011 by David S. Kozin in Uncategorized

Link to PDF File: DavidKozinQeeGResults LETTER TO PATIENT FROM PRIMARY PHYSICAN I have received the full quantitative EEG report from Dr. *****’s lab at Children’s Hospital. As I suspected, it is not a normal study. Generally, it shows electrical abnormalities, particularly in the posterior region of the nervous system, and particularly in the visual evoked potential study, a measure of visual function. The good news is that this is consistent with HPPD, and indicated no other ongoing problem, such as epilepsy. I am enclosing a copy for your records. MEDICAL RECORD FROM NEUROPHYSIOLOGY LABORATORY: Children’s Hospital, Boston, Massachusetts BRAIN ELECTRICAL ACTIVITY MAPPING (BEAM) QUANTITATIVE ELECTROENCEPHALOGRAM (qEEG) This report consists of 5 parts: • ELECTROENCEPHALOGRAM ANALYSIS and ELECTROENCEPHALOGRAM IMPRESSION • SPIKE TOPPOGRAPHY IMPRESSION • SPECTRAL ANALYSIS and SPECTRICAL IMPRESSION • EVOKED POTENTIALS ANALYSIS and EVOKED POTENTIALS IMPRESSION • SUMMARY OF FINDINGS ELECTROENCEPHALOGRAM IMPRESSION In the waking, eyes closed state this is 1 hour and 6 minutes record reveals 11 Hz well developed symmetrical and reactive occipital alpha atop otherwise low amplitude background. There is a well developed anterior-posterior gradient. Anteriorly, the experienced amounts of beta and theta are seen for age. In mild drowsiness on two occasions, a low amplitude spike

(More)…

Comments Off

DPD/DR from Marijuana: In their own words.

Published on October 7th, 2011 by David S. Kozin in DPD/DR, Uncategorized

My DP/DR began one night when I was smoking the last bit of weed that my friend and I had. We made the smallest joint on this planet. Seriously, it was real pathetic. Anyway, I smoked it with him, and everything in the room started turning all red. I started freaking out and told him I wanted to go to the hospital. This was the first time I had ever requested going to a hospital over a drug like this. Somehow this scared me even more than my LSD experience. Anyway, I finally calmed down hours later, and stayed home. The next morning I felt better, but a little off. I’d say a month after that the DP/DR just hit me. My arms and hands didn’t seem like mine, and my reflection just didn’t seem right. It’s never been the same since then (7 years ago). After about a year, I felt a lot better. To the point where I was totally fine in the world. I decided I wanted to lose some weight, so I started jogging with a friend of mine. I was jogging every single day for 2 miles. I was eating almost nothing. I lost

(More)…