This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
After blunt trauma to eye a patient develops circumcorneal congestion. The further test done is 
Select and explain. 
A. Indirect Ophthalmoscopy, B. Perimetry, C. Intraocular pressure measurement, D. Slit lamp
C: Intraocular pressure measurement
Answer: C: Intraocular pressure measurement 
Explanation: Blunt or penetrating ocular trauma leads to vision loss through glaucoma.
Thus, next step is to measure IOP