<prompt> Corneal curvature measured by ?KeratometryPachymetryGonioscopyPerimetry  <response>: Ans. is a i.e., Keratometry The Keratometry or ophthalmometry is an objective mehod of estimating the corneal astigmatism by measuring the curvature of central cornea. Gonioscopy - Biomicroscopic examination of the angle of anterior chamber. Perimetry - Procedure of estimating the extent of visual fields. Tonography - Non - invasive technique for determining the facility of aqeous outflow C - value. 