A thesis on the relationship between visual snow and glare

Hello, this is easy-to-understand ophthalmology story.

In my last post, I mentioned that glare can appear in a wide variety of ophthalmic and neurological diseases.

Glare, I can’t see the light wellㅜㅜ The reason for the dazzling may be because of 00. [link]

In fact, most of the patients with glare

The ophthalmic cause is dry eye syndrome and the neurological cause is migraine.

As I continue to organize materials related to Visual Snow,

In addition to visual symptoms such as esotropia and visual snow, patients with visual snow

It turns out that it is accompanied by serious glare.

Sometimes, the glare was so severe that it was difficult for me to live my daily life.

Today’s paper is

“How does glare appear in visual snow and how severe is it?”

This is a thesis that examines the


thesis introduction

A thesis on the relationship between visual snow and glare

2019 Journal of Neuroscience

This paper was published in Cephalagia.

It is a fairly authoritative academic journal on headaches.


summary

visual snow

The exact cause is still unknown

It is a mysterious disease for which no cure has been found.

Have you ever heard of “Visual Snow”, which does not go away? [link]

There is some overlap with migraines, but I’m not sure.

Photophobia is a very characteristic symptom not only for patients with visual snow but also for patients with migraines .

brain epistriatal cortex and thalamus
brain epistriatal cortex and thalamus

Glare is thought to be caused by dysfunction of the extra-striae cortex or the thalamus of the sciatic cortex of the brain.

In this paper, the authors

We studied the difference between glare in migraine headache and glare in visual snow .


Patient recruitment

The experimental group (research subject) was

Having symptoms of visual snow

We recruited patients who did not take drugs or had drowsy neurological abnormalities.

Control group (comparison target)

Patients with glare without visual snow symptoms were recruited from headache patients.


glare measurement

Glare is a subjective symptom

It is difficult to objectify.

Therefore, glare was scored using a glare-related question scale called L-VISS .

A thesis on the relationship between visual snow and glare
L-VISS

There is a total of 9 question lists.

  1. Is it difficult to go outdoors without wearing sunglasses?

  2. Does artificial light (fluorescent light, street light) cause glare?

  3. Is it hard to tolerate flickering lights (projectors, club lights)?

  4. Do you have vision problems, such as blurry or distorted vision after looking at bright light?

  5. Is it difficult to see patterns and patterns?

  6. After seeing any unusual patterns or patterns, does an afterimage remain?

  7. Is there any problem with vision such as decreased vision or distortion after seeing patterns or patterns?

  8. Is there an afterimage after watching a computer or TV screen?

  9. Do you have any problems with your eyesight, such as blurred vision or distortion, after looking at a computer or TV screen?

Depending on the degree of each question, 0~4 points can be selected, and a minimum of 0 points and a maximum of 36 points can be recorded.


result

A thesis on the relationship between visual snow and glare

The number of visual snow patients who participated in the study was a small number of 19, but let’s look at some characteristics.

Among patients with visual snow

1/3 have no migraines

1/3 of migraine without aura

One-third had migraine with aura.

For more information on migraine headaches and no aura, see the post below.

Eye pain & headache, expert knowledge easily explained by an ophthalmologist (Part. 2) [Link]

In short, it is a story that patients with visual snow may or may not have migraines .

There were no other differences between the patients with visual snow (experimental group) and the control group (comparative group), headache patients without visual snow symptoms.


A thesis on the relationship between visual snow and glare

The following is a graph comparing the glare scale values between the visual snow patient (VSS) and the comparator (C).

If you look at the part marked in red in the first graph,

It can be seen that the visual snow patient has significantly more severe glare compared to the comparison target .

(Statistically, the p value showed a significant result)

In other words , “Visual Snow patients have more severe glare than migraine patients.”

the second graph

between the experimental group and the control group

A graph comparing each other according to migraine presence, migraine without aura, and migraine with aura.

Again, the visual snow patients had severe glare.


Review

result

Visual Snow patients showed severe glare regardless of migraine or aura symptoms .

degree of glare

It was similar to the degree of glare experienced by chronic migraine patients during a headache attack .

That is, it appears to suffer from very severe glare .

the peculiar difference is

In the case of migraine, if there was glare only at the time of the attack when the headache occurs,

In Visual Snow, glare is constantly present .


If migraine is accompanied by visual snow patients

There is an increased risk of developing additional symptoms other than visual snow.

However, visual snow and migraine appear to be caused by different mechanisms .

Visual Snow patients with migraine have persistent visual snow symptoms regardless of migraine attacks

Visual Snow not responding to common migraine medications

The two above support this.


Glare in migraine

Because it appears due to malfunction of the thalamus or thalamic cortex of the brain, or excessive activation of the cingulate cortex

Some antiepileptic medications, high blood pressure medications, and antidepressants can reduce activation.

But the glare in Visual Snow is

It is similar to migraine but appears to be caused by a different mechanism.

This is an area that needs to be further studied.


conclusion

Glare in Visual Snow

Occurs independent of migraine headaches.

The severity is similar to that of a migraine attack, and it is very painful because it is a symptom that is constantly present .


concluding

More than

Glare was studied in a patient with visual snow.

There is no clear cure yet, but it looks like there will be big gains soon.

As for the treatments that have been tried so far,

Please refer to the last post.

The latest paper on the effect of visual snow treatment (Lamotrigine) [Link]

What was the most effective way to reduce visual snow? [link]

Thanks for reading this long post,

Please use the community .

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