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
Increased intraocular tension can be diagnosed by ? 
Select and explain. 
A. Tonometer, B. Pachymeter, C. Placido's disc, D. Keratometer
A: Tonometer
Answer: A: Tonometer 
Explanation: Ans. is 'a' i.e., Tonometer The exact measurement of intraocular pressure is done by an instrument called tonometer. Indentation (Schiotz tonometer) and applanation (e.g., Goldmann's tonometer) tonometers are frequently used.