Talk:Dissociated vertical deviation

Cosmetic

Is it worth saying that the condition and treatment are purely cosmetic ? In fact is it even worth considering abnormal ? I'm not medical at all : I have this condition, but AFAIK I close my eyes when daydreaming ! In fact when not 'fusing' both eyes, I go from 'up' to 'down' DVD when varying vergence ! I'm happy to ignore it ! Plus I'm 48 years old ... --195.137.93.171 (talk) 19:45, 23 July 2010 (UTC)

Not necessarily. When the DVD occurs, suppression of vision in that eye also occurs. Therefore, fusion and binocular vision ceases. If the DVD is controlled, it means there is potential to be using both eyes at the same time. --Lskil09 (talk) 07:15, 21 August 2011 (UTC)

Diagnosis conflicts with Treatment !

DVD is often mistaken for over-action of the inferior oblique extra-ocular muscles.

Management of this condition ... involves reducing the strength of the Inferior Oblique muscle of the affected eye(s).

Doesn't that mean it's the same thing ! IANAOrthoptist ... LOL --195.137.93.171 (talk) 19:53, 23 July 2010 (UTC)

http://aoj.uwpress.org/cgi/reprint/51/1/103.pdf
patients in four groups:
1) without overaction of vertical muscles,
2) inferior oblique muscle overaction,
3) superior oblique muscle overaction and
4) overaction of all four oblique muscles.
Sounds like up + down need opposite treatment - don't rely on Wikipedia before making that incision ...

http://www.cybersight.org/bins/volume_page.asp?cid=1-351-355-455
Looks like a decent Differential Diagnosis to me ! Seems we have 3 similar conditions : I shall resist making these pages : Dissociated Exodeviation and Vertical Strabismus

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1298405/
Sounds like it's a normal side-effect. IIRC the eyes are on the wrong side (left-eye wired to right-brain-hemisphere & vice-versa (Duh - why ?)). Kind of explains it as counteracting the springiness of the double-helix spiral twist of the optic nerves? I'll regard it as normal.

http://www.springerlink.com/content/p21h4447574x1881/
"... may remain latent (compensated) or manifest (incompensated) ..." Ah - normal or double-vision, respectively. OK

http://www.richmondeye.com/eyemotil.asp#dvd Cute animations - mouse pointer over the eye to cover "The covered eye then drifts upward. When it is uncovered again, it drifts back down into position, without any movement of the other eye. This is commonly bilateral." Both eyes go up ! So not caused by spiral optic nerves ? Maybe the spiral spring effect is mostly compensated, but residual 2nd-order effects remain, and it's "less weird" if they go the same way ?
<... goes to test self in mirror ...> ... inconclusive : no movement visible "from outside".

--195.137.93.171 (talk) 22:35, 23 July 2010 (UTC)

1. (above) All these 4 problems can occur with, or without a DVD. A DVD is not an overaction of a muscle, it is a dissociated movement of one eye only. They key term is 'dissociated'.

2. Dissociated Exodeviation and Vertical Strabismus Dissociated exo- deviations are more or less similar. Vertical Strabismus is the overall topic, so DVD would be a subset of this.

3. 'normal or double vision': No, when a DVD occurs the person does not get double vision. The brain suppresses the image of that eye. It learns this from childhood.

4. It's not caused by spiral optic nerves. It is an involuntary smooth movement upwards.

Thanks for your interest on the topic.

--Lskil09 (talk) 07:21, 21 August 2011 (UTC)