Upright gaze diplopia (938/1700)

A 33yo female complains of diplopia on upright gaze. Exam: ptosis can be seen. There are no
other complains or any significant PMH. What is the most appropriate inv for him?
a. Ophthalmoscopy
b. Visual field test
c. TFT
d. CT
e. Checking red reflex

Answer D
Because it is a sign of of acute hydrocephalus

Failure of upward gaze: Due to pressure on the tectal plate through the suprapineal recess; the limitation of upward gaze is of supranuclear origin