<prompt> Corneal curvature is measured byKeratometryPachymetryGonioscopyPerimetry  <response>: 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 