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Hypotropia is the similar condition, focus being on the eye with the visual axis lower than the fellow fixating eye. Dissociated vertical deviation is a special type of hypertropia leading to slow upward drift of one or rarely both eyes, usually when the patient is inattentive.
Hypotropia or hypertropia. In cases of vertical deviations, patients will report that: They see 5 lights: 2 red and 3 green; The lights are vertically displaced in relation to one another; The green lights (left eye) are on top of the red lights (right eye), which is interpreted as : R HT or LHypoT
If the line appears above the light, there will be a hypo-deviation and base up prisms are used measure and correct the deviation. If the white light is superimposed on the red line, there are no vertical deviations present ; Recording. Examples of recordings are shown below: MR: sc (F) L/R 5∆ eso 8∆ (FR) MR: sc (F) L/5∆ eso 8∆ (FR)
The type of deviation: whether it be eso, exo, hyper, hypo or cyclo tropia. The size of the deviation: slight, small, moderate or large; Speed to take up fixation: if the eye takes up fixation fast it means there is good vision in that eye; Accommodation on the deviation; Nystagmus; Dissociated vertical deviation (DVD)
When the covered eye is the non-amblyopic eye, the amblyopic eye suddenly becomes the person's only means of seeing. The strabismus is revealed by the movement of that eye to fixate on the examiner's finger. There are also vertical tropias (hypertropia and hypotropia) and cyclotropias.
Depending on the symptoms, the surgical correction of cyclotropia may involve a correction of an associated vertical deviation (hyper- or hypotropia), or a Harada–Ito procedure or another procedure to rotate the eye inwards, or yet another procedure to rotate it outwards.
Hypertropia/Hypotropia In a patient with an unsuppressed vertical deviation, one line will appear higher than the other. If the image of the right eye is higher than that of the left, this means the right eye is lower than the left.
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The Parks–Bielschowsky three-step test, also known as Park's three-step test or Bielschowsky head tilt test, is a method used to isolate the paretic extraocular muscle, particularly superior oblique muscle and trochlear nerve (fourth cranial nerve), in acquired vertical double vision.
Risk factors include premature birth, cerebral palsy, and a family history of the condition. [3] Types include esotropia, where the eyes are crossed ("cross eyed"); exotropia, where the eyes diverge ("lazy eyed" or "wall eyed"); and hypertropia or hypotropia where they are vertically misaligned. [3]