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A 5-year-old asymptomatic boy has bilateral superficial cornea | ophthalmology MCQ only

A 5-year-old asymptomatic boy has bilateral superficial corneal vascularisation inferiorly. What is the most likely cause?

.. This question appeared in the 2014 FRCOphth Part 2.
Anonymous Quiz
22%
a.allergy
26%
b.previous adenoviral disease
29%
c.blepharitis
23%
d.rosacea