Manifest and latent functions Video
manifest and latent functions manifest and latent functions.
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Eye Health?? Clinical Features??? Dissociated vertical deviation DVD is one of the ill-understood forms of strabismus. In this article, we will be talking about an introduction to DVD, along with clinical features, differential diagnosis, and management or treatment of dissociated vertical deviation.
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Like horizontal deviation, the vertical deviation can be either comitant or incomitant. It might be congenital or acquired and can be expressed in the form of hyperphoria, intermittent hypertropia, or constant hypertropia. Based on the involved eye, funcrions deviation may be left or right hypertropia. Similarly, it occurs solely or in association with horizontal deviation. Vertical deviation has been found to occur in approximately 5 percent of squints.
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Most of the vertical deviations are incomitant in nature. Types of vertical deviations. Comitant vertical deviations. In comitant deviation, the amount of deviation in the squinting eye remains constant unaltered in all the directions of gaze with no ocular movement limitation.
INTRODUCTION
It is of two types, hypertropia, and hypotropia. Intermittent deviations are more common than the constant form of deviation. Suppression, Amblyopia, or Vertical abnormal retinal correspondence ARC may occur in comitant vertical deviation. Incomitant vertical deviaitons.
Here, amount of deviation varies in different directions of gaze. Different types of incomitant vertical deviations are apparent oblique muscle dysfunction A, V, X, Y patternparetic vertical deviation, and restrictive vertical deviation. The patient may acquire nnomalous head posture AHP. As mentioned earlier, the dissociated vertical deviation is a comparatively ill-understood form of strabismus.
It is basically a manifest and latent functions also unilateral anomaly characterized by hyper deviation of either eye when the other eye is fixating. If the fixing eye is covered, the squinting eye takes fixation by moving down along with intortion.
It does not obey Hering??? Hence, the term??? Simply, DVD is characterized as an upward deviation of one eye or alternately of both eyes, which occurs either spontaneously or in testing situations when one eye is occluded.
The deviation may be latent or manifest but is always intermittent. Beilschowsky coined the term???]
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