Can you experience blindness with a basilar apex aneurysm?

Aneursym: If you refer to a left ventricular aneurysm, yes an embolic episode could result in blindness.

Yes: An excerpt from neurology describes this syndrome by "visual, oculomotor, and behavioral abnormalities, often without significant motor dysfunction. Rostral brainstem infarction produces oculomotor and pupillary signs"; "temporal and occipital infarctions are frequently accompanied by hemianopia." so your answer is yes you can lose vision from the consequence of a stroke (from an embolism ).