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: Unknown
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 o 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.Important corneal examinationsUsed foro Keratometry. Comeal topographyo Specular microscopyo Slit lampo Pachymetero Placido's disco Fluorescein, Alacian blue & Bengal rose staino Window reflex, slit lamp biomicroscopy; Ptacidos' discCurvature of corneaCorneal endothelial densityCorneal opacityThickness of corneaCorneal sheenComeal stainingCorneal surface