This case is of interest because of the unusual location of an aneurysm, its effect on the optic nerve preoperatively, and the method of eliciting perimetric findings. Report of Case On Feb. 27, 1958, a well-developed Caucasian man was first seen with the following symptoms: 1. Almost continuous headache over the left eye for one year, increasing in severity for the past two months. 2. Pressure sensation behind the left eye, aggravated by cough. 3. Blurred vision after cough. 4. Pain over left eye on sneezing. The entire ocular examination was negative except for the perimetric findings. The tangent screen test and 3/1,000 white office light revealed a left nasal contraction in the upper quadrant. With a history of headache and a field finding, the patient was referred to a neurological department for study. He was sent back with a negative finding and for observation. I immediately performed the test

Aneurysm of the Anterior Cerebral Artery

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