Abstract:
Abstract
We report a case of vertical rotatory nystagmus in a patient with bilateral absence of inferior rectus muscle. A 5-year-old female patient presented to Ophthalmology outpatient clinic with both eyes noted by parents moving around and unable to focus since birth. Her prenatal, antenatal and postnatal were unremarkable. There is no family history of nystagmus. Best corrected visual acuity of both eyes were 6/24 with low hyperopic astigmatism. Extraocular movement showed vertical rotatory nystagmus especially on upgaze and unable to perform downgaze with no abnormal head posture. Ocular examination showed no abnormality. MRI brain and orbit reported absent of bilateral inferior rectus muscle and no craniofacial abnormality.
Conclusion: To the author’s knowledge, this case is the first that presented with see-saw nystagmus as other reported cases might mimic those of inferior rectus paresis. In a high suspicious index, orbital imaging can assist in the diagnosis.
