A 19-month-old girl presented to the ophthalmology clinic at Children’s Hospital, Boston with bilateral horizontal nystagmus, first noticed at 3 months of age. Her parents stated that lately, the nystagmus was less noticeable; however, they became concerned because the patient did not seem to see things far away. Her parents also reported that she did not seem bothered by light. She had normal brain magnetic resonance imaging. Her past medical history was unremarkable and she had normal development. There was no difficulty with pregnancy, but the patient was delivered by C-section because of failure to progress. She had no known drug allergies and she was not taking any medication.
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