This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
Corneal curvature is measured by 
Select and explain. 
A. Keratometry, B. Pachymetry, C. Gonioscopy, D. Perimetry
A: Keratometry
Answer: A: Keratometry 
Explanation: The 'Keratometry' or 'ophthalmometry' is an objective method of estimating by measuring the curvature of the central cornea Gonioscopy- Biomicroscopic examination of the angle of the anterior chamber Perimetry-Procedure of estimating the extent of visual fields Tonography- a Non-invasive technique for determining the facility of aqueous outflow (C- value) Reference : AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 575