Question 1

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A 12-year-old male of Eastern European descent gave a 10-day history of central blurred vision in the right eye. He was otherwise fit and well but had a history of a "post-viral illness" one year ago. There was no recent travel history. He had 6D myopia affecting both eyes and no previous ocular history. On examination, right visual acuity (VA) was 6/36 with spectacles and 6/24 with pinhole. Left VA was 6/5 with spectacles and 6/5 with pinhole. No relative afferent pupillary defect (RAPD) was elicited and anterior segments were white and quiet. Humphrey visual fields and fundus photos are shown above.

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1. Which of the following would be the least informative test?

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