Talk:Palinopsia

Inaccurate information

This article is not accurate. Color inversion is not rare; on the contrary negative afterimages are a central part of palinopsia (I should know, I have it). Furthermore duration of stimulus and intensity both have a large impact on the duration of the afterimage - it's just that the amount of exposure required to generate an afterimage is much less than in a normal person.

Palinopsia and vitamin D deficiency?

In the past the writer experienced Palinopsia. Tests by an opthalmologist and a neurologist didn't yield any explanation, other than an assurance that there was nothing seriously wrong. However, a routine blood test showed a severe vitamin D deficiency (possibly related to my vegan diet). The symptoms disappeared after taking a vitamin D supplement (non-animal based supplement is available). Excessive use of vitamin D supplements can also cause serious problems. If anyone wants to try this, they should consult a physician and test the Vitamin D level.Ilanko 10:29, 17 July 2007 (UTC)

Apparantly overdosing, a well-known problem with vitamin D supplementation, isn't a problem when you use a transdermal cream: http://www.youtube.com/watch?v=OsRvoZNDLSc —Preceding unsigned comment added by Lumarine (talk • contribs) 17:31, 2 September 2008 (UTC)

Benzodiazepines

"these and certain other visual disorders may be the result of a lack of inhibitory neural signals in all or part of the visual center of the brain"

"benzodiazepines . . . as they promote uptake of GABA, an inhibitory neurotransmitter, they might reduce the overstimulation which has been shown to occur in palinopsia sufferers."

This appears contradictory. If benzodiazepines promote uptake of inhibitory GABA, wouldn't that mean there would be less of it around, so that there would be even less inhibition and even more overstimulation? (I am thinking by analogy with serotonin reuptake inhibitors like Prozac, which, as I understand it, work by inhibiting uptake of serotonin by cells so that there is more of it left around in the brain to stimulate receptors.) Does the author mean that the benzodiazepines potentiate the effects of GABA, perhaps by making is stick better to the receptors? Or something else? Treharne (talk) 07:48, 1 April 2009 (UTC)

How do these persistant images differ from normal afterimages?

The article doesn't quite explain what this is or how these persistant images differ from normal afterimages. 96.231.17.143 (talk) 03:09, 15 September 2014 (UTC)