Inconsistency

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The incomitancy ( Latin incomitatus "unaccompanied") is one of the most important symptoms of eye muscle paralysis in strabology and neuroophthalmology . They can be used to determine the extent of paresis. The incomitance describes the change in a squint deviation in different viewing directions. The more pronounced the paralysis, the greater the incomitability. The result is a significant increase in the squint angle when looking in the direction of action of the affected muscle.

In the case of fixation with the healthy eye, this leads to a so-called "primary" squint angle, and in the case of fixation with the paralyzed eye to a significantly larger "secondary" squint angle. The inconsistency is quantified by measuring the difference between two squint angles in opposite viewing directions.

An inconsistency of squint angles can also occur with non-paretic squint forms, for example with the so-called alphabet symptom . Certain eye muscle operations can also lead to inconsistencies.

As Inkomitanz opposite of the term concomitance the approximately constant degree of Schiel deviation in all viewing directions, a cardinal symptom of early childhood Begleitschielens (concomitant strabismus), or congenital syndrome Schiel .

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