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A photo essay demonstrating the pitfalls in visual field testing is presented.

This is a rare presentation of brain tumour in the region of the lateral geniculate nucleus (LGN) presenting as a homonymous horizontal sectoranopia (HHS). The case highlights that subtle field defects can be asymptomatic and only detected by formal perimetry. Although homonymous sectoranopia is a rare form of visual field defect, it should be recognised as a potential manifestation of potentially significant intracranial pathology. [ABSTRACT FROM AUTHOR]

The article presents a case study of a 74 year-old man who had a three day history of a red right eye and decreased vision. It is reported that he had no past ophthalmic history. His only past medical history was that he had had a cerebrovascular accident one month. He was diagnosed with ocular ischaemic syndrome (OIS) secondary to occult giant cell arteritis. It occurs when there is reduced flow in both the internal and external carotid arteries.