Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Ophthalmic symptoms are rare manifestations of the intracranial arachnoid cyst, and include unilateral exophthalmos, visual field abnormality, decreased visual acuity and isolated palsies of the third, fourth and sixth cranial nerves [1–5].
Category: