The eye and its adnexae (the extraocular muscles, orbit, orbital walls and eyelids) can be involved in malignant disease, either as the primary source of the tumour or as a site of secondary metastatic involvement. Indeed, there is a wide variety of different tumours which are known to affect the eye, this diversity being a consequence of the richness of the ocular tissues present. In addition, disorders of vision or eye movements may be the presenting signs and symptoms of intracranial malignancy.