cerebroscopy

from The Century Dictionary.

• noun Examination of the fundus of the eye for the purpose of obtaining data concerning the circulation of blood in the brain.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Med.) Examination of the brain for the diagnosis of disease; esp., the act or process of diagnosticating the condition of the brain by examination of the interior of the eye (as with an ophthalmoscope).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun medicine, dated examination of the brain for the diagnosis of disease, especially by examining the interior of the eye, as with an ophthalmoscope