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Case of the week  33 ( February 2012 )
Congenital Nystagmus with a null-point



 The mother of this 4 years old child noted that her son has dancing eyes and abnormal extreme right gaze eye turn most of the time . The condition was noticed shortly after birth , he was normally delivered, no history of systemic or eye diseases , he is an intelligent child
Eye Examination shows bilateral normal fundi , VA is 6/12  both eyes . Refraction is insignificant.

 
Video : Eye Motility of this child



 
This is a case of typical congenital nystagmus with null point ( at the extreme right gaze ) , this is the point of the least oscillation and the best VA .

Surgery for nystagmus can be indicated in several clinical situations.  Before considering surgery, pathologic causes for nystagmus must be ruled out.   Red flags for pathologic nystagmus include:  vertical nystagmus, asymmetric nystagmus, new onset nystagmus (not present from birth), intermittent nystagmus, and nystagmus associated with other neurological signs.  Also, nonsurgical treatment for nystagmus is usually considered, in appropriate cases, before surgical intervention is entertained.

 Surgery for nystagmus causing a consistently present abnormal head posture is performed to relocate the position of decreased nystagmus (optimal vision) to the primary gaze position. 

This can be accomplished by various means with recession/resection procedures , (Kestenbaum/Anderson) procedure being the most common.  Surgery can be done for both vertical and horizontal types of nystagmus.

If Nystagmus with null point is accompanied with horizontal deviation , another calculation to be added to (Kestenbaum/Anderson) procedure .



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