This communication is based on information and material obtained from several sources. Dr. Richard Lindenberg has supplied autopsy material from the Baltimore City Morgue, case reports in the Johns Hopkins Hospital over the last decade have been studied, and a few outstanding contributions * have been considered in the light of personal experience with visual field defects in proven cases of aneurysm. The study has concerned only saccular (congenital, berry, or developmental) aneurysms.
A first query which well might come to mind is, how important are visual field changes in the diagnosis of aneurysm? The answer is that they may be of extreme importance in a small percentage of such cases. Aneurysms, through rupture, frequently account for death, and in many instances prior to rupture there is no reason to suspect their presence. In routine autopsies, according to Adams1,1a the incidence of unruptured aneurysms is 2%, of ruptured aneurysms 1.8%.
WALSH FB. Visual Field Defects Due to Aneurysms at the Circle of Willis. Arch Ophthalmol. 1964;71(1):15-27. doi:10.1001/archopht.1964.00970010031004