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Osteopetrosis craniopathy: a rare cause of bilateral compressive optic neuropathy and facial nerve palsy

A 10-year-old girl with underlying osteopetrosis presented with left-sided lagophthalmos (inability to close the eyelids completely) associated with painless blurring of vision for many months. She denied any previous ocular surgery, trauma or taking any medication. There was left lower motor neuron facial nerve palsy. Her right eye vision was 6/18 and her left eye vision was 6/6.There was right relative afferent pupillary defect with reduced colour vision and light brightness sensitivity, suggestive of optic nerve dysfunction. Both optic discs …